diff --git a/.cargo/config.toml b/.cargo/config.toml
index eb89fa1e55..7e4e7a0f90 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -1,8 +1,8 @@
 [alias]
 xtask = "run --package xtask --"
 
-# @fb-only: [build]
-# @fb-only: target-dir = "../../../buck-out/elp"
+# @fb-only
+# @fb-only
 
 [profile.release]
 codegen-units = 1
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e9980283f2..0a2bb2508f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,7 +30,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        platform-arch: [ubuntu-22.04-x64, ubuntu-22.04-arm, macos-15-x64, macos-latest-arm, windows-2022-x64]
+        platform-arch: [ubuntu-22.04-x64, ubuntu-22.04-arm, macos-13-x64, macos-latest-arm, windows-2022-x64]
         otp-version: [26.2, 27.3, 28.0]
         include:
           - otp-version: 26.2
@@ -55,8 +55,8 @@ jobs:
             os: linux
             target: aarch64-unknown-linux-gnu
             vscode-target: linux-arm64
-          - platform-arch: macos-15-x64
-            platform: macos-15-intel
+          - platform-arch: macos-13-x64
+            platform: macos-13
             os: macos
             target: x86_64-apple-darwin
             vscode-target: darwin-x64
@@ -97,8 +97,6 @@ jobs:
         run: |
           sudo apt-get update
           sudo apt-get install -y crossbuild-essential-arm64
-      - name: Install Buck2
-        uses: dtolnay/install-buck2@latest
       - id: setup-erlang
         uses: ./.github/actions/setup-erlang
         with:
@@ -137,7 +135,7 @@ jobs:
       - name: Test elp
         # Do not run the tests in case of cross-compilation or on Windows
         if: matrix.platform-arch != 'macos-latest-arm' && matrix.os != 'windows'
-        run: 'cargo test --workspace --target ${{ matrix.target }}'
+        run: 'cargo test --no-default-features --workspace --target ${{ matrix.target }}'
       - name: Build elp (No Windows)
         if: matrix.os != 'windows'
         run: 'cargo build --release  --target ${{ matrix.target }} --config target.aarch64-unknown-linux-gnu.linker=\"aarch64-linux-gnu-gcc\"'
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index 7572a84e98..51f0340659 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -4,7 +4,7 @@
         {
             "label": "ELP: build (debug)",
             "type": "shell",
-            // @fb-only: "command": "./meta/cargo.sh build",
+            // @fb-only
             "command": "cargo build", // @oss-only
             "group": {
                 "kind": "build",
@@ -19,7 +19,7 @@
         {
             "label": "ELP: build (release)",
             "type": "shell",
-            // @fb-only: "command": "./meta/cargo.sh build --release",
+            // @fb-only
             "command": "cargo build --release", // @oss-only
             "group": {
                 "kind": "build",
@@ -34,7 +34,7 @@
         {
             "label": "ELP: build (release-thin)",
             "type": "shell",
-            // @fb-only: "command": "./meta/cargo.sh build --profile release-thin --bins",
+            // @fb-only
             "command": "cargo build --profile release-thin --bins", // @oss-only
             "group": {
                 "kind": "build",
@@ -49,7 +49,7 @@
         {
             "label": "ELP: run clippy on workspace",
             "type": "shell",
-            // @fb-only: "command": "./meta/clippy.sh --workspace --tests",
+            // @fb-only
             "command": "cargo clippy --workspace --tests", // @oss-only
             "group": {
                 "kind": "build",
@@ -64,7 +64,7 @@
         {
             "label": "ELP: run clippy on workspace, apply fixes",
             "type": "shell",
-            // @fb-only: "command": "./meta/clippy.sh --workspace --tests --fix",
+            // @fb-only
             "command": "cargo clippy --workspace --tests --fix", // @oss-only
             "group": {
                 "kind": "build",
@@ -79,7 +79,7 @@
         {
             "label": "ELP: run tests on workspace",
             "type": "shell",
-            // @fb-only: "command": "./meta/cargo.sh test --workspace",
+            // @fb-only
             "command": "cargo test --workspace", // @oss-only
             "group": {
                 "kind": "build",
diff --git a/crates/base_db/src/fixture.rs b/crates/base_db/src/fixture.rs
index cd1328d14d..d6d2205ce9 100644
--- a/crates/base_db/src/fixture.rs
+++ b/crates/base_db/src/fixture.rs
@@ -87,7 +87,6 @@ pub trait WithFixture: Default + SourceDatabaseExt + 'static {
         let (fixture, change) = ChangeFixture::parse(fixture_str);
         let mut db = Self::default();
         change.apply(&mut db, &|path| fixture.resolve_file_id(path));
-        fixture.validate(&db);
         (db, fixture)
     }
 }
@@ -102,7 +101,6 @@ pub struct ChangeFixture {
     pub diagnostics_enabled: DiagnosticsEnabled,
     pub tags: FxHashMap<FileId, Vec<(TextRange, Option<String>)>>,
     pub annotations: FxHashMap<FileId, Vec<(TextRange, String)>>,
-    pub expect_parse_errors: bool,
 }
 
 struct Builder {
@@ -174,7 +172,6 @@ impl ChangeFixture {
         let FixtureWithProjectMeta {
             fixture,
             mut diagnostics_enabled,
-            expect_parse_errors,
         } = fixture_with_meta.clone();
 
         let builder = Builder::new(diagnostics_enabled.clone());
@@ -347,7 +344,6 @@ impl ChangeFixture {
                 diagnostics_enabled,
                 tags,
                 annotations,
-                expect_parse_errors,
             },
             change,
             project,
@@ -409,64 +405,6 @@ impl ChangeFixture {
             .get(&VfsPath::from(path.clone()))
             .cloned()
     }
-
-    /// Validate all files in the fixture for syntax errors.
-    /// Panics with context if any syntax errors are found.
-    /// Skips validation if `expect_parse_errors` is set to true.
-    #[track_caller]
-    pub fn validate<DB: SourceDatabaseExt>(&self, db: &DB) {
-        if self.expect_parse_errors {
-            return;
-        }
-
-        let mut errors_found = Vec::new();
-
-        for file_id in &self.files {
-            let parse = db.parse(*file_id);
-            let errors = parse.errors();
-
-            if !errors.is_empty() {
-                let path = self
-                    .files_by_path
-                    .iter()
-                    .find_map(|(vfs_path, id)| {
-                        if id == file_id {
-                            Some(
-                                vfs_path
-                                    .as_path()
-                                    .map(|p| p.to_string())
-                                    .unwrap_or_else(|| format!("{:?}", vfs_path)),
-                            )
-                        } else {
-                            None
-                        }
-                    })
-                    .unwrap_or_else(|| format!("FileId({:?})", file_id));
-
-                let file_text = SourceDatabaseExt::file_text(db, *file_id);
-                let tree = parse.tree();
-                errors_found.push((path, file_text.to_string(), errors.to_vec(), tree));
-            }
-        }
-
-        if !errors_found.is_empty() {
-            let mut message =
-                String::from("Fixture validation failed: syntax errors found in test fixture\n\n");
-
-            for (path, text, errors, tree) in errors_found {
-                message.push_str(&format!("File: {}\n", path));
-                message.push_str(&format!("Errors: {:?}\n", errors));
-                message.push_str(&format!("Content:\n{}\n", text));
-                message.push_str(&format!("Parse Tree:\n{:#?}\n", tree));
-                message.push_str("---\n");
-            }
-            message.push_str(
-                "If this is expected, add `//- expect_parse_errors` to the start of the fixture\n",
-            );
-
-            panic!("{}", message);
-        }
-    }
 }
 
 fn inc_file_id(file_id: &mut FileId) {
diff --git a/crates/base_db/src/lib.rs b/crates/base_db/src/lib.rs
index 0cd8df74c9..6b3757ff43 100644
--- a/crates/base_db/src/lib.rs
+++ b/crates/base_db/src/lib.rs
@@ -32,7 +32,7 @@ mod module_index;
 // Public API
 
 pub mod fixture;
-// @fb-only: mod meta_only;
+// @fb-only
 pub mod test_utils;
 pub use change::Change;
 pub use elp_project_model::AppType;
@@ -476,7 +476,7 @@ static ref IGNORED_SOURCES: Vec<Regex> = {
     let regexes: Vec<Vec<Regex>> = vec![
         vec![Regex::new(r"^.*_SUITE_data/.+$").unwrap()],
         //ignore sources goes here
-        // @fb-only: meta_only::ignored_sources_regexes()
+        // @fb-only
     ];
     regexes.into_iter().flatten().collect::<Vec<Regex>>()
    };
diff --git a/crates/elp/src/arc_types.rs b/crates/elp/src/arc_types.rs
index 374dcdba2f..c113311661 100644
--- a/crates/elp/src/arc_types.rs
+++ b/crates/elp/src/arc_types.rs
@@ -8,8 +8,8 @@
  * above-listed licenses.
  */
 
-// @fb-only: /// Types as defined in https://www.internalfb.com/intern/wiki/Linting/adding-linters/#flow-type
-// @fb-only: /// and https://www.internalfb.com/code/fbsource/[1238f73dac0efd4009443fee6a345a680dc9401b]/whatsapp/server/erl/tools/lint/arcanist.py?lines=17
+// @fb-only
+// @fb-only
 use std::path::Path;
 
 use serde::Serialize;
diff --git a/crates/elp/src/bin/args.rs b/crates/elp/src/bin/args.rs
index c9790e9314..0f057ce1e6 100644
--- a/crates/elp/src/bin/args.rs
+++ b/crates/elp/src/bin/args.rs
@@ -72,17 +72,6 @@ pub struct ParseAllElp {
     /// Report system memory usage and other statistics
     #[bpaf(long("report-system-stats"))]
     pub report_system_stats: bool,
-    /// Minimum severity level to report. Valid values: error, warning, weak_warning, information
-    #[bpaf(
-        argument("SEVERITY"),
-        complete(severity_completer),
-        fallback(None),
-        guard(
-            severity_guard,
-            "Please use error, warning, weak_warning, or information"
-        )
-    )]
-    pub severity: Option<String>,
 }
 
 #[derive(Clone, Debug, Bpaf)]
@@ -155,6 +144,8 @@ pub struct EqwalizeAll {
     /// Also eqwalize opted-in generated modules from project (deprecated)
     #[bpaf(hide)]
     pub include_generated: bool,
+    /// Also eqwalize test modules from project
+    pub include_tests: bool,
     /// Exit with a non-zero status code if any errors are found
     pub bail_on_error: bool,
     /// Print statistics when done
@@ -171,6 +162,8 @@ pub struct EqwalizeTarget {
     /// Also eqwalize opted-in generated modules from application (deprecated)
     #[bpaf(hide)]
     pub include_generated: bool,
+    /// Also eqwalize test modules from project
+    pub include_tests: bool,
     /// Exit with a non-zero status code if any errors are found
     pub bail_on_error: bool,
     /// target, like //erl/chatd/...
@@ -189,6 +182,8 @@ pub struct EqwalizeApp {
     /// Also eqwalize opted-in generated modules from project (deprecated)
     #[bpaf(hide)]
     pub include_generated: bool,
+    /// Also eqwalize test modules from project
+    pub include_tests: bool,
     /// Run with rebar
     pub rebar: bool,
     /// Exit with a non-zero status code if any errors are found
@@ -211,6 +206,8 @@ pub struct EqwalizeStats {
     /// Also eqwalize opted-in generated modules from project (deprecated)
     #[bpaf(hide)]
     pub include_generated: bool,
+    /// Also eqwalize test modules from project
+    pub include_tests: bool,
     /// If specified, use the provided CLI severity mapping instead of the default one
     pub use_cli_severity: bool,
 }
@@ -786,25 +783,6 @@ fn format_guard(format: &Option<String>) -> bool {
     }
 }
 
-fn severity_completer(_: &Option<String>) -> Vec<(String, Option<String>)> {
-    vec![
-        ("error".to_string(), None),
-        ("warning".to_string(), None),
-        ("weak_warning".to_string(), None),
-        ("information".to_string(), None),
-    ]
-}
-
-fn severity_guard(severity: &Option<String>) -> bool {
-    match severity {
-        None => true,
-        Some(s) if s == "error" || s == "warning" || s == "weak_warning" || s == "information" => {
-            true
-        }
-        _ => false,
-    }
-}
-
 fn macros_completer(_: &Option<String>) -> Vec<(String, Option<String>)> {
     vec![
         ("expand".to_string(), None),
@@ -911,7 +889,7 @@ impl Lint {
 
     /// To prevent flaky test results we allow disabling streaming when applying fixes
     pub fn skip_stream_print(&self) -> bool {
-        self.apply_fix || self.no_stream
+        self.apply_fix && self.no_stream
     }
 }
 
diff --git a/crates/elp/src/bin/elp_parse_cli.rs b/crates/elp/src/bin/elp_parse_cli.rs
index 770ab60456..16d4675d7d 100644
--- a/crates/elp/src/bin/elp_parse_cli.rs
+++ b/crates/elp/src/bin/elp_parse_cli.rs
@@ -57,35 +57,6 @@ use crate::args::ParseAllElp;
 use crate::reporting;
 use crate::reporting::print_memory_usage;
 
-fn parse_severity(severity: &str) -> Option<diagnostics::Severity> {
-    match severity {
-        "error" => Some(diagnostics::Severity::Error),
-        "warning" => Some(diagnostics::Severity::Warning),
-        "weak_warning" => Some(diagnostics::Severity::WeakWarning),
-        "information" => Some(diagnostics::Severity::Information),
-        _ => None,
-    }
-}
-
-fn severity_rank(severity: diagnostics::Severity) -> u8 {
-    match severity {
-        diagnostics::Severity::Error => 1,
-        diagnostics::Severity::Warning => 2,
-        diagnostics::Severity::WeakWarning => 3,
-        diagnostics::Severity::Information => 4,
-    }
-}
-
-fn meets_severity_threshold(
-    diag_severity: diagnostics::Severity,
-    min_severity: Option<diagnostics::Severity>,
-) -> bool {
-    match min_severity {
-        None => true,
-        Some(min) => severity_rank(diag_severity) <= severity_rank(min),
-    }
-}
-
 #[derive(Debug)]
 struct ParseResult {
     name: String,
@@ -176,19 +147,6 @@ pub fn parse_all(
     let memory_end = MemoryUsage::now();
     let memory_used = memory_end - memory_start;
 
-    let min_severity = args
-        .severity
-        .as_ref()
-        .and_then(|s| parse_severity(s.as_str()));
-
-    res.retain(|parse_result| {
-        parse_result
-            .diagnostics
-            .diagnostics_for(parse_result.file_id)
-            .iter()
-            .any(|diag| meets_severity_threshold(diag.severity, min_severity))
-    });
-
     if res.is_empty() {
         if args.is_format_normal() {
             writeln!(cli, "No errors reported")?;
@@ -207,7 +165,6 @@ pub fn parse_all(
         for diags in res {
             let mut combined: Vec<diagnostics::Diagnostic> =
                 diags.diagnostics.diagnostics_for(diags.file_id);
-            combined.retain(|diag| meets_severity_threshold(diag.severity, min_severity));
             if args.is_format_normal() {
                 writeln!(cli, "  {}: {}", diags.name, combined.len())?;
             }
diff --git a/crates/elp/src/bin/eqwalizer_cli.rs b/crates/elp/src/bin/eqwalizer_cli.rs
index 141b2157d0..a91bcdd869 100644
--- a/crates/elp/src/bin/eqwalizer_cli.rs
+++ b/crates/elp/src/bin/eqwalizer_cli.rs
@@ -186,7 +186,10 @@ pub fn do_eqwalize_all(
         .par_bridge()
         .progress_with(pb.clone())
         .map_with(analysis.clone(), |analysis, (name, _source, file_id)| {
-            if analysis.should_eqwalize(file_id).unwrap() && !otp_file_to_ignore(analysis, file_id)
+            if analysis
+                .should_eqwalize(file_id, args.include_tests)
+                .unwrap()
+                && !otp_file_to_ignore(analysis, file_id)
             {
                 if args.stats {
                     add_stat(name.to_string());
@@ -266,7 +269,9 @@ pub fn do_eqwalize_app(
         .iter_own()
         .filter_map(|(_name, _source, file_id)| {
             if analysis.file_app_name(file_id).ok()? == Some(AppName(args.app.clone()))
-                && analysis.should_eqwalize(file_id).unwrap()
+                && analysis
+                    .should_eqwalize(file_id, args.include_tests)
+                    .unwrap()
                 && !otp_file_to_ignore(analysis, file_id)
             {
                 Some(file_id)
@@ -334,7 +339,9 @@ pub fn eqwalize_target(
                 let vfs_path = VfsPath::from(src.clone());
                 if let Some((file_id, _)) = loaded.vfs.file_id(&vfs_path) {
                     at_least_one_found = true;
-                    if analysis.should_eqwalize(file_id).unwrap()
+                    if analysis
+                        .should_eqwalize(file_id, args.include_tests)
+                        .unwrap()
                         && !otp_file_to_ignore(analysis, file_id)
                     {
                         file_ids.push(file_id);
@@ -401,7 +408,9 @@ pub fn eqwalize_stats(
         .par_bridge()
         .progress_with(pb.clone())
         .map_with(analysis.clone(), |analysis, (name, _source, file_id)| {
-            if analysis.should_eqwalize(file_id).expect("cancelled")
+            if analysis
+                .should_eqwalize(file_id, args.include_tests)
+                .expect("cancelled")
                 && !otp_file_to_ignore(analysis, file_id)
             {
                 analysis
diff --git a/crates/elp/src/bin/glean.rs b/crates/elp/src/bin/glean.rs
index cb420261d2..c31d45dc9e 100644
--- a/crates/elp/src/bin/glean.rs
+++ b/crates/elp/src/bin/glean.rs
@@ -84,7 +84,7 @@ const REC_ARITY: u32 = 99;
 const HEADER_ARITY: u32 = 100;
 const FACTS_FILE: &str = "facts.json";
 
-// @fb-only: mod meta_only;
+// @fb-only
 
 #[derive(Serialize, Debug, Eq, Hash, PartialEq, Clone)]
 struct GleanFileId(u32);
@@ -994,7 +994,7 @@ impl GleanIndexer {
                 .filter(|text| !text.is_empty())
         });
 
-        // @fb-only: let exdoc_link = elp_ide::meta_only::exdoc_links::module_exdoc_link(&module, &sema);
+        // @fb-only
         let exdoc_link: Option<String> = None; // @oss-only
 
         ModuleFact::new(
@@ -1532,7 +1532,7 @@ impl GleanIndexer {
             }) => {
                 let def = macro_def.as_ref()?;
                 let mut resolved = Self::resolve_macro_v2(sema, def, source_file, ctx)?;
-                // @fb-only: meta_only::resolve_macro_expansion(sema, *expansion, ctx, &mut resolved);
+                // @fb-only
                 Some(resolved)
             }
             hir::AnyExpr::Pat(Pat::MacroCall { macro_def, .. })
@@ -1560,7 +1560,7 @@ impl GleanIndexer {
         vars: FxHashMap<&Location, &String>,
     ) -> Vec<VarDecl> {
         let mut result = vec![];
-        if !db.is_eqwalizer_enabled(file_id) {
+        if !db.is_eqwalizer_enabled(file_id, false) {
             return result;
         }
         let module_diagnostics = db.eqwalizer_diagnostics_by_project(project_id, vec![file_id]);
@@ -1875,9 +1875,9 @@ impl GleanIndexer {
         let source_file = sema.parse(file_id);
         let range = Self::find_range(sema, ctx, &source_file, &expr_source)?;
 
-        // @fb-only: use elp_ide::meta_only::wam_links;
-        // @fb-only: let wam_ctx = wam_links::WamEventCtx::new(sema.db.upcast());
-        // @fb-only: let wam_url = wam_ctx.build_wam_link(name).map(|link| link.url());
+        // @fb-only
+        // @fb-only
+        // @fb-only
         let wam_url = None; // @oss-only
 
         Some(XRef {
@@ -2335,10 +2335,10 @@ mod tests {
     fn xref_types_test() {
         let spec = r#"
         //- /glean/app_glean/src/glean_module81.erl
-        -type small() ::  {non_neg_integer() | infinity}.
+        -type small() :: #{non_neg_integer() | infinity}.
 
         //- /glean/app_glean/src/glean_module8.erl
-        -type huuuge() ::  {non_neg_integer() | infinity}.
+        -type huuuge() :: #{non_neg_integer() | infinity}.
         -spec baz(
             A :: huuuge(),
         %%       ^^^^^^ glean_module8/huuuge/0
@@ -2393,10 +2393,10 @@ mod tests {
     fn xref_types_v2_test() {
         let spec = r#"
         //- /glean/app_glean/src/glean_module81.erl
-        -type small() ::  {non_neg_integer() | infinity}.
+        -type small() :: #{non_neg_integer() | infinity}.
 
         //- /glean/app_glean/src/glean_module8.erl
-        -type huuuge() ::  {non_neg_integer() | infinity}.
+        -type huuuge() :: #{non_neg_integer() | infinity}.
         -spec baz(
             A :: huuuge(),
         %%       ^^^^^^ glean_module8.erl/type/huuuge/0
diff --git a/crates/elp/src/bin/lint_cli.rs b/crates/elp/src/bin/lint_cli.rs
index 241a3d4481..f7ac4ff114 100644
--- a/crates/elp/src/bin/lint_cli.rs
+++ b/crates/elp/src/bin/lint_cli.rs
@@ -295,7 +295,7 @@ pub fn do_codemod(
     let res;
     let streamed_err_in_diag;
     let mut any_diagnostics_printed = false;
-    let mut initial_diags = {
+    let initial_diags = {
         // We put this in its own block so that analysis is
         // freed before we apply lints. To apply lints
         // recursively, we need to update the underlying
@@ -394,54 +394,30 @@ pub fn do_codemod(
     let mut err_in_diag = streamed_err_in_diag;
     // At this point, the analysis variable from above is dropped
 
-    // When streaming is disabled (--no-stream) and we're not applying fixes,
-    // we need to print diagnostics now since they weren't printed during streaming
-    if args.no_stream && !args.apply_fix && !initial_diags.is_empty() {
-        let analysis = loaded.analysis();
-        let mut module_count = 0;
-        initial_diags.sort_by(|(a, _, _), (b, _, _)| a.cmp(b));
-        for result in &initial_diags {
-            let printed = print_diagnostic_result(
-                cli,
-                &analysis,
-                diagnostics_config,
-                args,
-                loaded,
-                &args.module,
-                &mut err_in_diag,
-                &mut module_count,
-                result,
-            )?;
-            any_diagnostics_printed = any_diagnostics_printed || printed;
+    // Print "No diagnostics reported" if no diagnostics were found after filtering
+    if !any_diagnostics_printed {
+        if args.is_format_normal() {
+            writeln!(cli, "No diagnostics reported")?;
         }
-    }
-
-    // Handle apply_fix case separately since it needs to filter diagnostics anyway
-    if args.apply_fix {
-        if diagnostics_config.enabled.all_enabled() {
+    } else {
+        if args.apply_fix && diagnostics_config.enabled.all_enabled() {
             bail!(
                 "We cannot apply fixes if all diagnostics enabled. Perhaps provide --diagnostic-filter"
             );
         }
-
-        let mut filtered_diags = {
-            let analysis = loaded.analysis();
-            filter_diagnostics(
-                &analysis,
-                &args.module,
-                Some(&diagnostics_config.enabled),
-                &initial_diags,
-                &FxHashSet::default(),
-            )?
-        };
-
-        if filtered_diags.is_empty() {
-            if args.is_format_normal() {
-                writeln!(cli, "No diagnostics reported")?;
-            }
-        } else {
+        if args.apply_fix && !diagnostics_config.enabled.all_enabled() {
+            let mut initial_diags = {
+                let analysis = loaded.analysis();
+                filter_diagnostics(
+                    &analysis,
+                    &args.module,
+                    Some(&diagnostics_config.enabled),
+                    &initial_diags,
+                    &FxHashSet::default(),
+                )?
+            };
             if args.skip_stream_print() {
-                filtered_diags.sort_by(|(a, _, _), (b, _, _)| a.cmp(b));
+                initial_diags.sort_by(|(a, _, _), (b, _, _)| a.cmp(b));
                 let module_count: &mut i32 = &mut 0;
                 let has_diagnostics: &mut bool = &mut false;
                 if args.is_format_json() {
@@ -452,7 +428,7 @@ pub fn do_codemod(
                         &mut err_in_diag,
                         module_count,
                         has_diagnostics,
-                        &filtered_diags,
+                        &initial_diags,
                     )?;
                 } else {
                     {
@@ -466,7 +442,7 @@ pub fn do_codemod(
                             &mut err_in_diag,
                             module_count,
                             has_diagnostics,
-                            &filtered_diags,
+                            &initial_diags,
                         )?;
                         // Analysis is dropped here
                     }
@@ -480,7 +456,7 @@ pub fn do_codemod(
                 &mut loaded.vfs,
                 args,
                 &mut changed_files,
-                filtered_diags,
+                initial_diags,
             );
             // We handle the fix application result here, so
             // the overall status of whether error-severity
@@ -492,19 +468,8 @@ pub fn do_codemod(
                     writeln!(cli, "Apply fix failed: {err:#}").ok();
                 }
             };
-
-            if err_in_diag {
-                bail!("Errors found")
-            }
         }
-    } else {
-        // Non-apply-fix case: rely on any_diagnostics_printed which is set
-        // correctly based on filtered diagnostics during streaming/batch printing
-        if !any_diagnostics_printed {
-            if args.is_format_normal() {
-                writeln!(cli, "No diagnostics reported")?;
-            }
-        } else if err_in_diag {
+        if err_in_diag {
             bail!("Errors found")
         }
     }
diff --git a/crates/elp/src/bin/main.rs b/crates/elp/src/bin/main.rs
index 56535e4492..2ecb900759 100644
--- a/crates/elp/src/bin/main.rs
+++ b/crates/elp/src/bin/main.rs
@@ -40,7 +40,7 @@ mod erlang_service_cli;
 mod explain_cli;
 mod glean;
 mod lint_cli;
-// @fb-only: mod meta_only;
+// @fb-only
 mod reporting;
 mod shell;
 mod ssr_cli;
@@ -110,7 +110,7 @@ fn setup_cli_telemetry(args: &Args) {
         }
         _ => {
             // Initialize CLI telemetry, if used
-            // @fb-only: meta_only::initialize_telemetry();
+            // @fb-only
         }
     }
 }
@@ -288,7 +288,7 @@ mod tests {
         let (_stdout, stderr, code) = elp(args_vec![
             "parse-all",
             "--project",
-            "../../test/test_projects/standard",
+            "../../test_projects/standard",
             "--to",
             tmp.path(),
         ]);
@@ -306,7 +306,7 @@ mod tests {
 
     fn parse_all_complete(project: &str) -> Result<i32> {
         // Just check the command returns.
-        let project_path = format!("../../test/test_projects/{project}");
+        let project_path = format!("../../test_projects/{project}");
         let tmp = Builder::new().prefix("elp_parse_all_").tempdir().unwrap();
         let (_stdout, _stderr, code) = elp(args_vec![
             "parse-all",
@@ -443,34 +443,33 @@ mod tests {
                             })
                             .unwrap();
 
-                        let exp_path = expect_file!(format!(
-                            "../resources/test/{}/{}/{}.pretty",
-                            project,
-                            app,
-                            module.as_str(),
-                        ));
-                        let (stdout, _) = cli.to_strings();
-
                         let otp_version = OTP_VERSION.as_ref().expect("MISSING OTP VERSION");
                         let otp_version_regex =
-                            regex::bytes::Regex::new(&format!("{}OTP([0-9]+)Only", "@")).unwrap();
+                            regex::bytes::Regex::new(&format!("{}OTPVersionDependent", "@"))
+                                .unwrap();
                         let contents = analysis.file_text(file_id).unwrap();
-                        let otp_version_capture = otp_version_regex
-                            .captures(&contents.as_bytes()[0..(2001.min(contents.len()))]);
-                        if let Some((_, [otp_version_only])) =
-                            otp_version_capture.map(|cap| cap.extract())
-                        {
-                            if otp_version_only == otp_version.as_bytes() {
-                                assert_normalised_file(
-                                    exp_path,
-                                    &stdout,
-                                    project_path.into(),
-                                    false,
-                                );
+                        let otp_version_dependent = otp_version_regex
+                            .is_match(&contents.as_bytes()[0..(2001.min(contents.len()))]);
+                        let exp_path = {
+                            if otp_version_dependent {
+                                expect_file!(format!(
+                                    "../resources/test/{}/{}/{}-OTP-{}.pretty",
+                                    project,
+                                    app,
+                                    module.as_str(),
+                                    otp_version,
+                                ))
+                            } else {
+                                expect_file!(format!(
+                                    "../resources/test/{}/{}/{}.pretty",
+                                    project,
+                                    app,
+                                    module.as_str(),
+                                ))
                             }
-                        } else {
-                            assert_normalised_file(exp_path, &stdout, project_path.into(), false);
-                        }
+                        };
+                        let (stdout, _) = cli.to_strings();
+                        assert_normalised_file(exp_path, &stdout, project_path.into(), false);
                     }
                 }
                 EqwalizerDiagnostics::NoAst { module } => {
@@ -605,7 +604,10 @@ mod tests {
     fn eqwalize_target_diagnostics_match_snapshot_pretty() {
         if cfg!(feature = "buck") {
             simple_snapshot(
-                args_vec!["eqwalize-target", "//standard:app_a",],
+                args_vec![
+                    "eqwalize-target",
+                    "//whatsapp/elp/test_projects/standard:app_a",
+                ],
                 "standard",
                 expect_file!("../resources/test/standard/eqwalize_target_diagnostics.pretty"),
                 true,
@@ -669,24 +671,6 @@ mod tests {
         );
     }
 
-    #[test_case(false ; "rebar")]
-    #[test_case(true  ; "buck")]
-    fn parse_all_diagnostics_severity(buck: bool) {
-        simple_snapshot_expect_error(
-            args_vec![
-                "parse-elp",
-                "--module",
-                "diagnostics",
-                "--severity",
-                "error"
-            ],
-            "diagnostics",
-            expect_file!("../resources/test/diagnostics/parse_all_diagnostics_error.stdout"),
-            buck,
-            None,
-        );
-    }
-
     #[test_case(false ; "rebar")]
     #[test_case(true  ; "buck")]
     fn parse_elp_file_attribute(buck: bool) {
@@ -970,9 +954,7 @@ mod tests {
             assert!(tmp_file.clone().exists());
             let content = fs::read_to_string(tmp_file).unwrap();
             let mut buck_config = BuckConfig::default();
-            buck_config.buck_root = Some(AbsPathBuf::assert_utf8(
-                current_dir().unwrap().join(path_str.clone()),
-            ));
+            buck_config.buck_root = Some(AbsPathBuf::assert_utf8(current_dir().unwrap()));
             let prelude_cell = get_prelude_cell(&buck_config).expect("could not get prelude");
             let prelude_cell = prelude_cell.strip_prefix("/").unwrap();
             let content = content.replace(prelude_cell, "/[prelude]/");
@@ -984,13 +966,38 @@ mod tests {
                 Some(AbsPathBuf::assert(Utf8PathBuf::from_path_buf(abs).unwrap()));
             let content = normalise_prelude_path(content, buck_config);
 
-            let content = sort_json(&content);
-
             expect![[r#"
                 {
                   "apps": [
                     {
+                      "name": "test_exec",
+                      "dir": "/[prelude]//erlang/common_test/test_exec/src",
+                      "src_dirs": [
+                        ""
+                      ],
+                      "extra_src_dirs": [],
+                      "include_dirs": [],
+                      "macros": {}
+                    },
+                    {
+                      "name": "diagnostics_app_a",
+                      "dir": "app_a",
+                      "src_dirs": [
+                        "src"
+                      ],
+                      "extra_src_dirs": [],
+                      "include_dirs": [
+                        "include"
+                      ],
+                      "macros": {
+                        "COMMON_TEST": "true",
+                        "TEST": "true"
+                      }
+                    },
+                    {
+                      "name": "app_a_SUITE",
                       "dir": "app_a/test",
+                      "src_dirs": [],
                       "extra_src_dirs": [
                         ""
                       ],
@@ -998,88 +1005,61 @@ mod tests {
                       "macros": {
                         "COMMON_TEST": "true",
                         "TEST": "true"
-                      },
-                      "name": "app_a_SUITE",
-                      "src_dirs": []
+                      }
                     },
                     {
-                      "dir": "/[prelude]//erlang/common_test/test_exec/src",
-                      "extra_src_dirs": [],
-                      "include_dirs": [],
-                      "macros": {},
-                      "name": "test_exec",
-                      "src_dirs": [
-                        ""
-                      ]
-                    },
-                    {
-                      "dir": "/[prelude]//erlang/common_test/common",
-                      "extra_src_dirs": [],
-                      "include_dirs": [
-                        "include"
-                      ],
-                      "macros": {},
                       "name": "common",
+                      "dir": "/[prelude]//erlang/common_test/common",
                       "src_dirs": [
                         "src"
-                      ]
-                    },
-                    {
-                      "dir": "/[prelude]//erlang/common_test/cth_hooks/src",
-                      "extra_src_dirs": [],
-                      "include_dirs": [
-                        ""
                       ],
-                      "macros": {},
-                      "name": "cth_hooks",
-                      "src_dirs": [
-                        ""
-                      ]
-                    },
-                    {
-                      "dir": "/[prelude]//erlang/shell/src",
-                      "extra_src_dirs": [],
-                      "include_dirs": [],
-                      "macros": {},
-                      "name": "buck2_shell_utils",
-                      "src_dirs": [
-                        ""
-                      ]
-                    },
-                    {
-                      "dir": "app_a",
                       "extra_src_dirs": [],
                       "include_dirs": [
                         "include"
                       ],
-                      "macros": {
-                        "COMMON_TEST": "true",
-                        "TEST": "true"
-                      },
-                      "name": "diagnostics_app_a",
-                      "src_dirs": [
-                        "src"
-                      ]
+                      "macros": {}
                     },
                     {
-                      "dir": "/[prelude]//erlang/common_test/test_binary/src",
+                      "name": "cth_hooks",
+                      "dir": "/[prelude]//erlang/common_test/cth_hooks/src",
+                      "src_dirs": [
+                        ""
+                      ],
+                      "extra_src_dirs": [],
+                      "include_dirs": [
+                        ""
+                      ],
+                      "macros": {}
+                    },
+                    {
+                      "name": "buck2_shell_utils",
+                      "dir": "/[prelude]//erlang/shell/src",
+                      "src_dirs": [
+                        ""
+                      ],
                       "extra_src_dirs": [],
                       "include_dirs": [],
-                      "macros": {},
+                      "macros": {}
+                    },
+                    {
                       "name": "test_binary",
+                      "dir": "/[prelude]//erlang/common_test/test_binary/src",
                       "src_dirs": [
                         ""
-                      ]
-                    },
-                    {
-                      "dir": "/[prelude]//erlang/common_test/test_cli_lib/src",
+                      ],
                       "extra_src_dirs": [],
                       "include_dirs": [],
-                      "macros": {},
+                      "macros": {}
+                    },
+                    {
                       "name": "test_cli_lib",
+                      "dir": "/[prelude]//erlang/common_test/test_cli_lib/src",
                       "src_dirs": [
                         ""
-                      ]
+                      ],
+                      "extra_src_dirs": [],
+                      "include_dirs": [],
+                      "macros": {}
                     }
                   ],
                   "deps": []
@@ -1094,12 +1074,6 @@ mod tests {
         content.replace(prelude_cell, "/[prelude]/")
     }
 
-    fn sort_json(content: &str) -> String {
-        let mut json: serde_json::Value = serde_json::from_str(content).unwrap();
-        json.sort_all_objects();
-        serde_json::to_string_pretty(&json).unwrap()
-    }
-
     #[test]
     #[ignore]
     fn build_info_json_buck_bxl_generated() {
@@ -1113,7 +1087,7 @@ mod tests {
                 "--to",
                 tmp_file.clone(),
                 "--project",
-                path_str.clone()
+                path_str
             ];
             let (stdout, stderr, code) = elp(args);
             assert_eq!(
@@ -1128,9 +1102,7 @@ mod tests {
             assert!(tmp_file.clone().exists());
             let content = fs::read_to_string(tmp_file).unwrap();
             let mut buck_config = BuckConfig::default();
-            buck_config.buck_root = Some(AbsPathBuf::assert_utf8(
-                current_dir().unwrap().join(path_str.clone()),
-            ));
+            buck_config.buck_root = Some(AbsPathBuf::assert_utf8(current_dir().unwrap()));
             let prelude_cell = get_prelude_cell(&buck_config).expect("could not get prelude");
             let prelude_cell = prelude_cell.strip_prefix("/").unwrap();
             let content = content.replace(prelude_cell, "/[prelude]/");
@@ -1454,7 +1426,7 @@ mod tests {
                 "lint",
                 "--experimental",
                 "--config-file",
-                "../../test/test_projects/linter/does_not_exist.toml"
+                "../../test_projects/linter/does_not_exist.toml"
             ],
             "linter",
             expect_file!("../resources/test/linter/parse_elp_lint_custom_config_invalid_output.stdout"),
@@ -1466,7 +1438,7 @@ mod tests {
             &[],
             false,
             Some(expect![[r#"
-                unable to read "../../test/test_projects/linter/does_not_exist.toml": No such file or directory (os error 2)
+                unable to read "../../test_projects/linter/does_not_exist.toml": No such file or directory (os error 2)
             "#]]),
         )
         .expect("bad test");
@@ -1482,7 +1454,7 @@ mod tests {
                 "lint",
                 "--experimental",
                 "--config-file",
-                "../../test/test_projects/linter/elp_lint_test1.toml"
+                "../../test_projects/linter/elp_lint_test1.toml"
             ],
             "linter",
             expect_file!("../resources/test/linter/parse_elp_lint_custom_config_output.stdout"),
@@ -1508,7 +1480,7 @@ mod tests {
                 "lint",
                 "--experimental",
                 "--config-file",
-                "../../test/test_projects/linter/elp_lint_adhoc.toml",
+                "../../test_projects/linter/elp_lint_adhoc.toml",
                 "--module",
                 "app_b",
                 "--apply-fix",
@@ -1539,7 +1511,7 @@ mod tests {
                 "--diagnostic-ignore",
                 "W0011",
                 "--config-file",
-                "../../test/test_projects/linter/elp_lint_test_ignore.toml"
+                "../../test_projects/linter/elp_lint_test_ignore.toml"
             ],
             "linter",
             expect_file!("../resources/test/linter/parse_elp_lint_ignore.stdout"),
@@ -1583,7 +1555,7 @@ mod tests {
             &[],
             false,
             Some(expect![[r#"
-                failed to read "../../test/test_projects/linter_bad_config/.elp_lint.toml":expected a right bracket, found an identifier at line 6 column 4
+                failed to read "../../test_projects/linter_bad_config/.elp_lint.toml":expected a right bracket, found an identifier at line 6 column 4
             "#]]),
         )
         .expect("bad test");
@@ -1601,20 +1573,6 @@ mod tests {
         );
     }
 
-    #[test_case(false ; "rebar")]
-    #[test_case(true  ; "buck")]
-    fn lint_no_stream_produces_output(buck: bool) {
-        if otp::supports_eep66_sigils() {
-            simple_snapshot_expect_error(
-                args_vec!["lint", "--no-stream"],
-                "diagnostics",
-                expect_file!("../resources/test/diagnostics/lint_no_stream.stdout"),
-                buck,
-                None,
-            );
-        }
-    }
-
     #[test_case(false ; "rebar")]
     #[test_case(true  ; "buck")]
     fn lint_no_diagnostics_filter_all_enabled_json(buck: bool) {
@@ -1649,7 +1607,7 @@ mod tests {
             args_vec![
                 "lint",
                 "--config-file",
-                "../../test/test_projects/linter/elp_lint_test2.toml"
+                "../../test_projects/linter/elp_lint_test2.toml"
             ],
             "linter",
             expect_file!("../resources/test/linter/parse_elp_lint_explicit_enable_output.stdout"),
@@ -1952,8 +1910,7 @@ mod tests {
             simple_snapshot_expect_stderror(
                 args_vec!["lint",],
                 "buck_bad_config",
-                // @fb-only: expect_file!("../resources/test/buck_bad_config/bxl_error_message.stdout"),
-                expect_file!("../resources/test/buck_bad_config/bxl_error_message_oss.stdout"), // @oss-only
+                expect_file!("../resources/test/buck_bad_config/bxl_error_message.stdout"),
                 true,
                 None,
                 true,
@@ -1968,7 +1925,7 @@ mod tests {
                 "lint",
                 "--no-stream"
                 "--config-file",
-                "../../test/test_projects/linter/elp_lint_warnings_as_errors.toml"
+                "../../test_projects/linter/elp_lint_warnings_as_errors.toml"
             ],
             "linter",
             expect_file!("../resources/test/linter/warnings_as_errors.stdout"),
@@ -1983,7 +1940,7 @@ mod tests {
             args_vec![
                 "lint",
                 "--config-file",
-                "../../test/test_projects/linter/elp_lint_custom_function_matches.toml",
+                "../../test_projects/linter/elp_lint_custom_function_matches.toml",
                 "--module",
                 "custom_function_matches"
             ],
@@ -2000,7 +1957,7 @@ mod tests {
             args_vec![
                 "lint",
                 "--config-file",
-                "../../test/test_projects/xref/elp_lint_unavailable_type.toml",
+                "../../test_projects/xref/elp_lint_unavailable_type.toml",
                 "--module",
                 "unavailable_type"
             ],
@@ -2017,7 +1974,7 @@ mod tests {
             args_vec![
                 "lint",
                 "--config-file",
-                "../../test/test_projects/linter/elp_lint_ssr_adhoc.toml",
+                "../../test_projects/linter/elp_lint_ssr_adhoc.toml",
             ],
             "linter",
             expect_file!("../resources/test/linter/ssr_ad_hoc.stdout"),
@@ -2032,7 +1989,7 @@ mod tests {
             args_vec![
                 "lint",
                 "--config-file",
-                "../../test/test_projects/linter/elp_lint_ssr_adhoc_parse_fail.toml",
+                "../../test_projects/linter/elp_lint_ssr_adhoc_parse_fail.toml",
             ],
             "linter",
             expect_file!("../resources/test/linter/ssr_ad_hoc_parse_fail.stdout"),
@@ -2218,41 +2175,6 @@ mod tests {
 
     #[test_case(false ; "rebar")]
     #[test_case(true  ; "buck")]
-    fn ssr_exclude_generated_by_default(buck: bool) {
-        simple_snapshot(
-            args_vec!["ssr", "--module", "erlang_diagnostics_errors_gen", "ok"],
-            "diagnostics",
-            expect_file!("../resources/test/diagnostics/ssr_exclude_generated.stdout"),
-            buck,
-            None,
-        );
-    }
-
-    #[test_case(false ; "rebar")]
-    #[test_case(true  ; "buck")]
-    fn ssr_include_generated_when_requested(buck: bool) {
-        simple_snapshot(
-            args_vec![
-                "ssr",
-                "--module",
-                "erlang_diagnostics_errors_gen",
-                "--include-generated",
-                "ok"
-            ],
-            "diagnostics",
-            expect_file!("../resources/test/diagnostics/ssr_include_generated.stdout"),
-            buck,
-            None,
-        );
-    }
-
-    #[test_case(false ; "rebar")]
-    #[test_case(true  ; "buck")]
-    // We cannot use `should_panic` for this test, since the OSS CI runs with the `buck` feature disabled.
-    // When this happens the test is translated into a no-op, which does not panic.
-    // TODO(T248259687): Switch to should_panic once Buck2 is available on GitHub.
-    //                   Or remove the ignore once hierarchical support is implemented.
-    #[ignore] // Support for hierarchical config is not implemented yet
     fn lint_hierarchical_config_basic(buck: bool) {
         simple_snapshot_sorted(
             args_vec!["lint", "--read-config"],
@@ -2263,18 +2185,6 @@ mod tests {
         );
     }
 
-    #[test_case(false ; "rebar")]
-    #[test_case(true  ; "buck")]
-    fn lint_linter_config_basic(buck: bool) {
-        simple_snapshot_sorted(
-            args_vec!["lint", "--read-config", "--no-stream"],
-            "linter_config",
-            expect_file!("../resources/test/linter_config/basic.stdout"),
-            buck,
-            None,
-        );
-    }
-
     #[test_case(false ; "rebar")]
     #[test_case(true  ; "buck")]
     fn eqwalizer_tests_check(buck: bool) {
@@ -3136,7 +3046,7 @@ mod tests {
     }
 
     fn project_path(project: &str) -> String {
-        format!("../../test/test_projects/{project}")
+        format!("../../test_projects/{project}")
     }
 
     fn strip_ansi_codes(s: &str) -> String {
diff --git a/crates/elp/src/bin/reporting.rs b/crates/elp/src/bin/reporting.rs
index 7ab10459fe..fe38287629 100644
--- a/crates/elp/src/bin/reporting.rs
+++ b/crates/elp/src/bin/reporting.rs
@@ -227,6 +227,9 @@ impl Reporter for JsonReporter<'_> {
         diagnostics: &[EqwalizerDiagnostic],
     ) -> Result<()> {
         let line_index = self.analysis.line_index(file_id)?;
+        // Pass include_Tests = false so that errors for tests files that are not opted-in are tagged as
+        // arc_types::Severity::Disabled and don't break CI.
+        let eqwalizer_enabled = self.analysis.is_eqwalizer_enabled(file_id, false).unwrap();
         let file_path = &self.loaded.vfs.file_path(file_id);
         let root_path = &self
             .analysis
@@ -235,8 +238,12 @@ impl Reporter for JsonReporter<'_> {
             .root_dir;
         let relative_path = get_relative_path(root_path, file_path);
         for diagnostic in diagnostics {
-            let diagnostic =
-                convert::eqwalizer_to_arc_diagnostic(diagnostic, &line_index, relative_path);
+            let diagnostic = convert::eqwalizer_to_arc_diagnostic(
+                diagnostic,
+                &line_index,
+                relative_path,
+                eqwalizer_enabled,
+            );
             let diagnostic = serde_json::to_string(&diagnostic)?;
             writeln!(self.cli, "{diagnostic}")?;
         }
diff --git a/crates/elp/src/bin/shell.rs b/crates/elp/src/bin/shell.rs
index 13ff79ed36..84ab218710 100644
--- a/crates/elp/src/bin/shell.rs
+++ b/crates/elp/src/bin/shell.rs
@@ -157,9 +157,10 @@ impl ShellCommand {
                 }
                 "eqwalize-app" => {
                     let include_generated = options.contains(&"--include-generated");
+                    let include_tests = options.contains(&"--include-tests");
                     if let Some(other) = options
                         .into_iter()
-                        .find(|&opt| opt != "--include-generated")
+                        .find(|&opt| opt != "--include-generated" && opt != "--include-tests")
                     {
                         return Err(ShellError::UnexpectedOption(
                             "eqwalize-app".into(),
@@ -176,6 +177,7 @@ impl ShellCommand {
                             rebar,
                             app: app.into(),
                             include_generated,
+                            include_tests,
                             bail_on_error: false,
                         })));
                     }
@@ -183,9 +185,10 @@ impl ShellCommand {
                 }
                 "eqwalize-all" => {
                     let include_generated = options.contains(&"--include-generated");
+                    let include_tests = options.contains(&"--include-tests");
                     if let Some(other) = options
                         .into_iter()
-                        .find(|&opt| opt != "--include-generated")
+                        .find(|&opt| opt != "--include-generated" && opt != "--include-tests")
                     {
                         return Err(ShellError::UnexpectedOption(
                             "eqwalize-all".into(),
@@ -201,6 +204,7 @@ impl ShellCommand {
                         rebar,
                         format: None,
                         include_generated,
+                        include_tests,
                         bail_on_error: false,
                         stats: false,
                         list_modules: false,
@@ -222,8 +226,10 @@ COMMANDS:
     eqwalize <modules>         Eqwalize specified modules
         --clause-coverage      Use experimental clause coverage checker
     eqwalize-all               Eqwalize all modules in the current project
+        --include-tests        Also eqwalize test modules from project
         --clause-coverage      Use experimental clause coverage checker
     eqwalize-app <app>         Eqwalize all modules in specified application
+        --include-tests        Also eqwalize test modules from project
         --clause-coverage      Use experimental clause coverage checker
 ";
 
diff --git a/crates/elp/src/bin/ssr_cli.rs b/crates/elp/src/bin/ssr_cli.rs
index 36f26d4554..f5729034b2 100644
--- a/crates/elp/src/bin/ssr_cli.rs
+++ b/crates/elp/src/bin/ssr_cli.rs
@@ -401,9 +401,6 @@ fn do_parse_one(
     name: &str,
     args: &Ssr,
 ) -> Result<Option<(String, FileId, Vec<diagnostics::Diagnostic>)>> {
-    if !args.include_generated && db.is_generated(file_id)? {
-        return Ok(None);
-    }
     if !args.include_tests && db.is_test_suite_or_test_helper(file_id)?.unwrap_or(false) {
         return Ok(None);
     }
diff --git a/crates/elp/src/config.rs b/crates/elp/src/config.rs
index 681a022261..2637eae5a2 100644
--- a/crates/elp/src/config.rs
+++ b/crates/elp/src/config.rs
@@ -30,7 +30,7 @@ use serde::de::DeserializeOwned;
 use serde_json::json;
 
 use crate::from_json;
-// @fb-only: use crate::meta_only;
+// @fb-only
 
 // Defines the server-side configuration of ELP. We generate *parts*
 // of VS Code's `package.json` config from this.
@@ -180,7 +180,7 @@ impl Config {
             return;
         }
         self.data = ConfigData::from_json(json);
-        // @fb-only: meta_only::harmonise_gks(self);
+        // @fb-only
     }
 
     pub fn update_gks(&mut self, json: serde_json::Value) {
diff --git a/crates/elp/src/convert.rs b/crates/elp/src/convert.rs
index c8db07a5d0..3715353c11 100644
--- a/crates/elp/src/convert.rs
+++ b/crates/elp/src/convert.rs
@@ -126,11 +126,18 @@ pub fn eqwalizer_to_arc_diagnostic(
     d: &EqwalizerDiagnostic,
     line_index: &LineIndex,
     relative_path: &Path,
+    eqwalizer_enabled: bool,
 ) -> arc_types::Diagnostic {
     let pos = position(line_index, d.range.start());
     let line_num = pos.line + 1;
     let character = Some(pos.character + 1);
-    let severity = arc_types::Severity::Error;
+    let severity = if eqwalizer_enabled {
+        arc_types::Severity::Error
+    } else {
+        // We use Severity::Disabled so that diagnostics are reported in cont lint
+        // but not in CI.
+        arc_types::Severity::Disabled
+    };
     // formatting: https://fburl.com/max_wiki_link_to_phabricator_rich_text
     let explanation = match &d.explanation {
         Some(s) => format!("```\n{s}\n```"),
diff --git a/crates/elp/src/lib.rs b/crates/elp/src/lib.rs
index f462141e39..0e9a2e28e6 100644
--- a/crates/elp/src/lib.rs
+++ b/crates/elp/src/lib.rs
@@ -37,7 +37,7 @@ pub mod line_endings;
 pub mod lsp_ext;
 mod mem_docs;
 pub mod memory_usage;
-// @fb-only: mod meta_only;
+// @fb-only
 mod op_queue;
 mod project_loader;
 pub mod reload;
@@ -108,7 +108,7 @@ pub fn otp_file_to_ignore(db: &Analysis, file_id: FileId) -> bool {
                  "redbug_dtop",
                  ]
                 .iter()
-                // @fb-only: .chain(meta_only::FILES_TO_IGNORE.iter())
+                // @fb-only
                 .map(SmolStr::new)
                 .collect();
     }
diff --git a/crates/elp/src/resources/test/buck_bad_config/bxl_error_message_oss.stdout b/crates/elp/src/resources/test/buck_bad_config/bxl_error_message_oss.stdout
deleted file mode 100644
index f5225605a5..0000000000
--- a/crates/elp/src/resources/test/buck_bad_config/bxl_error_message_oss.stdout
+++ /dev/null
@@ -1 +0,0 @@
-Project Initialisation Failed: invalid or missing buck 2 configuration
diff --git a/crates/elp/src/resources/test/diagnostics/lint_no_stream.stdout b/crates/elp/src/resources/test/diagnostics/lint_no_stream.stdout
deleted file mode 100644
index eef1c92c6d..0000000000
--- a/crates/elp/src/resources/test/diagnostics/lint_no_stream.stdout
+++ /dev/null
@@ -1,138 +0,0 @@
-Reporting all diagnostics codes
-Diagnostics reported:
-app_a/src/app_a.erl:52:3-52:23::[Warning] [W0006] this statement has no effect
-app_a/src/app_a.erl:3:10-3:21::[WeakWarning] [W0037] Unspecific include.
-app_a/src/app_a.erl:27:3-27:9::[Warning] [W0017] Function 'foo:ok/0' is undefined.
-app_a/src/app_a.erl:28:4-28:11::[Warning] [W0017] Function 'mod:foo/0' is undefined.
-app_a/src/app_a.erl:72:4-72:11::[Warning] [W0017] Function 'foo:bar/2' is undefined.
-app_a/src/app_a.erl:37:11-37:28::[Warning] [W0017] Function 'mod_name:fun_name/2' is undefined.
-app_a/src/app_a.erl:58:11-58:24::[WeakWarning] [W0051] Binary string can be written using sigil syntax.
-app_a/src/app_a.erl:4:1-4:41::[Warning] [W0020] Unused file: inets/include/httpd.hrl
-app_a/src/app_a.erl:39:7-39:28::[Error] [L1267] variable 'A' shadowed in 'named fun'
-app_a/src/app_a.erl:55:32-55:35::[Error] [L1295] type uri/0 undefined
-app_a/src/app_a.erl:56:20-56:26::[Error] [L1295] type binary/1 undefined
-app_a/src/app_a.erl:72:3-72:34::[Error] [L1252] record record undefined
-app_a/src/app_a.erl:75:5-75:16::[Error] [L1252] record record undefined
-app_a/src/app_a.erl:35:1-35:2::[Warning] [L1230] function g/1 is unused
-app_a/src/app_a.erl:35:3-35:4::[Warning] [L1268] variable 'A' is unused
-app_a/src/app_a.erl:36:3-36:4::[Warning] [L1268] variable 'F' is unused
-app_a/src/app_a.erl:37:3-37:4::[Warning] [L1268] variable 'G' is unused
-app_a/src/app_a.erl:38:3-38:4::[Warning] [L1268] variable 'H' is unused
-app_a/src/app_a.erl:39:3-39:4::[Warning] [L1268] variable 'I' is unused
-app_a/src/app_a.erl:39:7-39:28::[Warning] [L1268] variable 'A' is unused
-app_a/src/app_a.erl:41:1-41:2::[Warning] [L1230] function h/0 is unused
-app_a/src/app_a.erl:45:1-45:2::[Warning] [L1230] function i/0 is unused
-app_a/src/app_a.erl:50:1-50:2::[Warning] [L1230] function j/2 is unused
-app_a/src/app_a.erl:50:15-50:16::[Warning] [L1268] variable 'A' is unused
-app_a/src/app_a.erl:50:23-50:24::[Warning] [L1268] variable 'B' is unused
-app_a/src/app_a.erl:55:1-55:46::[Warning] [L1296] type session(_) is unused
-app_a/src/app_a.erl:55:1-55:46::[Warning] [L1313] opaque type session(_) is not exported
-app_a/src/app_a.erl:56:7-56:13::[Warning] [L1296] type source(_) is unused
-app_a/src/app_a.erl:58:1-58:4::[Warning] [L1230] function map/2 is unused
-app_a/src/app_a.erl:60:1-60:9::[Warning] [L1230] function with_dot/0 is unused
-app_a/src/app_a.erl:62:1-62:9::[Warning] [L1230] function lang_dir/1 is unused
-app_a/src/app_a.erl:66:1-66:7::[Warning] [L1230] function escape/1 is unused
-app_a/src/app_a.erl:66:13-66:17::[Warning] [L1268] variable 'T' is unused
-app_a/src/app_a.erl:67:9-67:25::[Warning] [L1260] record all_configs_file is unused
-app_a/src/app_a.erl:71:1-71:2::[Warning] [L1230] function k/0 is unused
-app_a/src/app_a.erl:74:1-74:2::[Warning] [L1230] function l/1 is unused
-app_a/src/app_a.erl:77:1-77:2::[Warning] [L1230] function m/0 is unused
-app_a/src/broken_parse_trans.erl:10:21-10:22::[Error] [L1256] field b undefined in record a
-app_a/src/broken_parse_trans.erl:10:32-10:33::[Error] [L1262] variable 'B' is unbound
-app_a/src/cascading.erl:9:5-9:6::[Error] [W0004] Missing ')'
-        3:10-3:15: function foo/0 undefined
-        6:10-6:15: function foo/0 undefined
-        8:7-8:10: spec for undefined function foo/0
-app_a/src/diagnostics.erl:3:10-3:27::[WeakWarning] [W0037] Unspecific include.
-app_a/src/diagnostics.erl:4:10-4:34::[WeakWarning] [W0037] Unspecific include.
-app_a/src/diagnostics.erl:12:8-12:12::[Warning] [W0060] Match on a bound variable
-app_a/src/diagnostics.erl:4:1-4:36::[Error] [L0000] Issue in included file
-        [app_a/include/broken_diagnostics.hrl] 1:8-1:15: P1702: bad attribute
-        [app_a/include/broken_diagnostics.hrl] 3:6-3:15: P1702: bad attribute
-app_a/src/diagnostics.erl:6:31-6:45::[Error] [L1295] type undefined_type/0 undefined
-app_a/src/diagnostics.erl:7:1-7:5::[Warning] [L1230] function main/1 is unused
-app_a/src/diagnostics.erl:10:1-10:4::[Warning] [L1230] function foo/0 is unused
-app_a/src/lint_recursive.erl:23:5-23:14::[Warning] [W0006] this statement has no effect
-app_a/src/lint_recursive.erl:6:5-6:7::[Warning] [W0006] this statement has no effect
-app_a/src/lint_recursive.erl:14:5-14:12::[Warning] [L1268] variable 'Config1' is unused
-app_a/src/lint_recursive.erl:19:5-19:12::[Warning] [L1268] variable 'Config1' is unused
-app_a/src/lints.erl:5:1-5:14::[Error] [P1700] head mismatch 'head_mismatcX' vs 'head_mismatch'
-        4:1-4:14: Mismatched clause name
-app_a/src/lints.erl:4:22-4:23::[Warning] [W0018] Unexpected ';'
-app_a/src/lints.erl:2:10-2:25::[Error] [L1227] function head_mismatch/1 undefined
-app_a/src/otp27_docstrings.erl:34:9-34:24::[Warning] [W0002] Unused macro (THIS_IS_THE_END)
-app_a/src/otp27_docstrings.erl:24:5-24:6::[Warning] [W0060] Match on a bound variable
-app_a/src/otp27_docstrings.erl:30:5-30:6::[Warning] [W0060] Match on a bound variable
-app_a/src/otp27_sigils.erl:11:6-11:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:12:5-12:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:13:5-13:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:14:5-14:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:15:5-15:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:17:6-17:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:18:5-18:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:19:5-19:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:20:5-20:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:21:5-21:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:23:6-23:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:24:5-24:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:25:5-25:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:26:5-26:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:27:5-27:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:29:6-29:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:30:5-30:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:31:5-31:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:32:5-32:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:33:5-33:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:35:6-35:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:36:5-36:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:37:5-37:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:38:5-38:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:39:5-39:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:41:6-41:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:42:5-42:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:43:5-43:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:44:5-44:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:45:5-45:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:47:6-47:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:48:5-48:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:49:5-49:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:50:5-50:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:51:5-51:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:53:6-53:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:53:6-53:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:54:5-54:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:54:5-54:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:55:5-55:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:55:5-55:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:56:5-56:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:57:5-57:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:59:6-59:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:60:5-60:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:61:5-61:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:62:5-62:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:63:5-63:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:65:6-65:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:66:5-66:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:67:5-67:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:68:5-68:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:69:5-69:24::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:76:5-79:8::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:76:5-79:8::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:80:5-84:9::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:80:5-84:9::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:85:5-89:10::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:85:5-89:10::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:90:5-94:11::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:95:5-99:12::[Warning] [W0006] this statement has no effect
-app_a/src/otp27_sigils.erl:102:5-102:24::[WeakWarning] [W0051] Binary string can be written using sigil syntax.
-app_a/src/otp27_sigils.erl:128:9-128:24::[Warning] [W0002] Unused macro (THIS_IS_THE_END)
-app_a/src/otp27_sigils.erl:112:4-112:5::[Error] [P1711] syntax error before: X
-        4:15-4:18: function g/0 undefined
-        74:7-74:8: spec for undefined function g/0
-app_a/src/otp27_sigils.erl:71:5-71:6::[Warning] [L1268] variable 'X' is unused
-app_a/src/otp_7655.erl:5:1-5:28::[Error] [L1201] no module definition
-app_a/src/parse_error_a_cascade.erl:10:20-11:1::[Error] [W0004] Missing 'atom'
-        6:6-6:11: function bar/0 undefined
-app_a/src/suppressed.erl:8:5-8:9::[Warning] [L1268] variable 'Life' is unused
-app_a/src/syntax.erl:5:46-5:47::[Error] [P1711] syntax error before: ')'
-app_a/src/syntax.erl:11:9-11:10::[Error] [W0004] Missing ')'
diff --git a/crates/elp/src/resources/test/diagnostics/parse_all_diagnostics1.stdout b/crates/elp/src/resources/test/diagnostics/parse_all_diagnostics1.stdout
index 4b0a155055..7fe610f781 100644
--- a/crates/elp/src/resources/test/diagnostics/parse_all_diagnostics1.stdout
+++ b/crates/elp/src/resources/test/diagnostics/parse_all_diagnostics1.stdout
@@ -1,10 +1,9 @@
 module specified: diagnostics
 Diagnostics reported in 1 modules:
-  diagnostics: 7
+  diagnostics: 6
       2:9-2:26::[Hint] [W0037] Unspecific include.
       3:0-3:35::[Error] [L0000] Issue in included file
       3:9-3:33::[Hint] [W0037] Unspecific include.
       5:30-5:44::[Error] [L1295] type undefined_type/0 undefined
       6:0-6:4::[Warning] [L1230] function main/1 is unused
       9:0-9:3::[Warning] [L1230] function foo/0 is unused
-      11:7-11:11::[Warning] [W0060] Match on a bound variable
diff --git a/crates/elp/src/resources/test/diagnostics/parse_all_diagnostics_error.stdout b/crates/elp/src/resources/test/diagnostics/parse_all_diagnostics_error.stdout
deleted file mode 100644
index 3af8bfb086..0000000000
--- a/crates/elp/src/resources/test/diagnostics/parse_all_diagnostics_error.stdout
+++ /dev/null
@@ -1,5 +0,0 @@
-module specified: diagnostics
-Diagnostics reported in 1 modules:
-  diagnostics: 2
-      3:0-3:35::[Error] [L0000] Issue in included file
-      5:30-5:44::[Error] [L1295] type undefined_type/0 undefined
diff --git a/crates/elp/src/resources/test/diagnostics/parse_all_diagnostics_json.stdout b/crates/elp/src/resources/test/diagnostics/parse_all_diagnostics_json.stdout
index ede82c7c5f..0c3e5ae9a3 100644
--- a/crates/elp/src/resources/test/diagnostics/parse_all_diagnostics_json.stdout
+++ b/crates/elp/src/resources/test/diagnostics/parse_all_diagnostics_json.stdout
@@ -4,4 +4,3 @@
 {"path":"app_a/src/diagnostics.erl","line":6,"char":31,"code":"ELP","severity":"error","name":"L1295 (L1295)","original":null,"replacement":null,"description":"type undefined_type/0 undefined\n\nFor more information see: /erlang-error-index/l/L1295","docPath":null}
 {"path":"app_a/src/diagnostics.erl","line":7,"char":1,"code":"ELP","severity":"warning","name":"L1230 (L1230)","original":null,"replacement":null,"description":"function main/1 is unused\n\nFor more information see: /erlang-error-index/l/L1230","docPath":null}
 {"path":"app_a/src/diagnostics.erl","line":10,"char":1,"code":"ELP","severity":"warning","name":"L1230 (L1230)","original":null,"replacement":null,"description":"function foo/0 is unused\n\nFor more information see: /erlang-error-index/l/L1230","docPath":null}
-{"path":"app_a/src/diagnostics.erl","line":12,"char":8,"code":"ELP","severity":"warning","name":"W0060 (bound_var_in_lhs)","original":null,"replacement":null,"description":"Match on a bound variable\n\nFor more information see: /erlang-error-index/w/W0060","docPath":"website/docs/erlang-error-index/w/W0060.md"}
diff --git a/crates/elp/src/resources/test/diagnostics/parse_otp27_docstrings.jsonl b/crates/elp/src/resources/test/diagnostics/parse_otp27_docstrings.jsonl
index c34c9037db..5e286c673f 100644
--- a/crates/elp/src/resources/test/diagnostics/parse_otp27_docstrings.jsonl
+++ b/crates/elp/src/resources/test/diagnostics/parse_otp27_docstrings.jsonl
@@ -1,6 +1,4 @@
 module specified: otp27_docstrings
 Diagnostics reported in 1 modules:
-  otp27_docstrings: 3
-      23:4-23:5::[Warning] [W0060] Match on a bound variable
-      29:4-29:5::[Warning] [W0060] Match on a bound variable
+  otp27_docstrings: 1
       33:8-33:23::[Warning] [W0002] Unused macro (THIS_IS_THE_END)
diff --git a/crates/elp/src/resources/test/diagnostics/ssr_exclude_generated.stdout b/crates/elp/src/resources/test/diagnostics/ssr_exclude_generated.stdout
deleted file mode 100644
index 1cef26124c..0000000000
--- a/crates/elp/src/resources/test/diagnostics/ssr_exclude_generated.stdout
+++ /dev/null
@@ -1,2 +0,0 @@
-module specified: erlang_diagnostics_errors_gen
-No matches found
diff --git a/crates/elp/src/resources/test/diagnostics/ssr_include_generated.stdout b/crates/elp/src/resources/test/diagnostics/ssr_include_generated.stdout
deleted file mode 100644
index 2b88b6e10c..0000000000
--- a/crates/elp/src/resources/test/diagnostics/ssr_include_generated.stdout
+++ /dev/null
@@ -1,5 +0,0 @@
-module specified: erlang_diagnostics_errors_gen
-  erlang_diagnostics_errors_gen: 1
-      6:5-6:7::[WeakWarning] [ad-hoc: ssr-match] SSR pattern matched: ssr: ok.
-
-Matches found in 1 modules
diff --git a/crates/elp/src/resources/test/eqwalize_all_help.stdout b/crates/elp/src/resources/test/eqwalize_all_help.stdout
index 67497c4000..43f66a0a3a 100644
--- a/crates/elp/src/resources/test/eqwalize_all_help.stdout
+++ b/crates/elp/src/resources/test/eqwalize_all_help.stdout
@@ -1,10 +1,11 @@
-Usage: [--project PROJECT] [--as PROFILE] [[--format FORMAT]] [--rebar] [--bail-on-error] [--stats] [--list-modules]
+Usage: [--project PROJECT] [--as PROFILE] [[--format FORMAT]] [--rebar] [--include-tests] [--bail-on-error] [--stats] [--list-modules]
 
 Available options:
         --project <PROJECT>  Path to directory with project, or to a JSON file (defaults to `.`)
         --as <PROFILE>       Rebar3 profile to pickup (default is test)
         --format <FORMAT>    Show diagnostics in JSON format
         --rebar              Run with rebar
+        --include-tests      Also eqwalize test modules from project
         --bail-on-error      Exit with a non-zero status code if any errors are found
         --stats              Print statistics when done
         --list-modules       When printing statistics, include the list of modules parsed
diff --git a/crates/elp/src/resources/test/eqwalize_app.stdout b/crates/elp/src/resources/test/eqwalize_app.stdout
index bb128f249a..eaf1d3126a 100644
--- a/crates/elp/src/resources/test/eqwalize_app.stdout
+++ b/crates/elp/src/resources/test/eqwalize_app.stdout
@@ -1,4 +1,4 @@
-Usage: [--project PROJECT] [--as PROFILE] [--rebar] [--bail-on-error] <APP>
+Usage: [--project PROJECT] [--as PROFILE] [--include-tests] [--rebar] [--bail-on-error] <APP>
 
 Available positional items:
     <APP>  app name
@@ -6,6 +6,7 @@ Available positional items:
 Available options:
         --project <PROJECT>  Path to directory with project, or to a JSON file (defaults to `.`)
         --as <PROFILE>       Rebar3 profile to pickup (default is test)
+        --include-tests      Also eqwalize test modules from project
         --rebar              Run with rebar
         --bail-on-error      Exit with a non-zero status code if any errors are found
     -h, --help               Prints help information
diff --git a/crates/elp/src/resources/test/eqwalize_target_help.stdout b/crates/elp/src/resources/test/eqwalize_target_help.stdout
index e9a01166dd..eec74e4938 100644
--- a/crates/elp/src/resources/test/eqwalize_target_help.stdout
+++ b/crates/elp/src/resources/test/eqwalize_target_help.stdout
@@ -1,9 +1,10 @@
-Usage: [--project PROJECT] [--bail-on-error] <TARGET>
+Usage: [--project PROJECT] [--include-tests] [--bail-on-error] <TARGET>
 
 Available positional items:
     <TARGET>  target, like //erl/chatd/...
 
 Available options:
         --project <PROJECT>  Path to directory with project, or to a JSON file (defaults to `.`)
+        --include-tests      Also eqwalize test modules from project
         --bail-on-error      Exit with a non-zero status code if any errors are found
     -h, --help               Prints help information
diff --git a/crates/elp/src/resources/test/eqwalizer_tests/check/callbacks3_neg-OTP-26.pretty b/crates/elp/src/resources/test/eqwalizer_tests/check/callbacks3_neg-OTP-26.pretty
new file mode 100644
index 0000000000..63be36e638
--- /dev/null
+++ b/crates/elp/src/resources/test/eqwalizer_tests/check/callbacks3_neg-OTP-26.pretty
@@ -0,0 +1,14 @@
+error: incorrect_return_type_in_cb_implementation (See https://fb.me/eqwalizer_errors#incorrect_return_type_in_cb_implementation)
+   ┌─ check/src/callbacks3_neg.erl:12:1
+   │
+12 │ -behavior(gen_server).
+   │ ^^^^^^^^^^^^^^^^^^^^^
+   │ │
+   │ Incorrect return type for implementation of gen_server:handle_cast/2. Expected: {'noreply', term()} | {'noreply', term(), timeout() | 'hibernate' | {'continue', term()}} | {'stop', term(), term()}, Got: 'wrong_ret'.
+   │ 
+
+  'wrong_ret' is not compatible with {'noreply', term()} | {'noreply', term(), timeout() | 'hibernate' | {'continue', term()}} | {'stop', term(), term()}
+  because
+  'wrong_ret' is not compatible with {'noreply', term()}
+
+1 ERROR
diff --git a/crates/elp/src/resources/test/eqwalizer_tests/check/callbacks3_neg-OTP-27.pretty b/crates/elp/src/resources/test/eqwalizer_tests/check/callbacks3_neg-OTP-27.pretty
new file mode 100644
index 0000000000..63be36e638
--- /dev/null
+++ b/crates/elp/src/resources/test/eqwalizer_tests/check/callbacks3_neg-OTP-27.pretty
@@ -0,0 +1,14 @@
+error: incorrect_return_type_in_cb_implementation (See https://fb.me/eqwalizer_errors#incorrect_return_type_in_cb_implementation)
+   ┌─ check/src/callbacks3_neg.erl:12:1
+   │
+12 │ -behavior(gen_server).
+   │ ^^^^^^^^^^^^^^^^^^^^^
+   │ │
+   │ Incorrect return type for implementation of gen_server:handle_cast/2. Expected: {'noreply', term()} | {'noreply', term(), timeout() | 'hibernate' | {'continue', term()}} | {'stop', term(), term()}, Got: 'wrong_ret'.
+   │ 
+
+  'wrong_ret' is not compatible with {'noreply', term()} | {'noreply', term(), timeout() | 'hibernate' | {'continue', term()}} | {'stop', term(), term()}
+  because
+  'wrong_ret' is not compatible with {'noreply', term()}
+
+1 ERROR
diff --git a/crates/elp/src/resources/test/eqwalizer_tests/check/callbacks3_neg-OTP-28.pretty b/crates/elp/src/resources/test/eqwalizer_tests/check/callbacks3_neg-OTP-28.pretty
new file mode 100644
index 0000000000..a24c7a6a48
--- /dev/null
+++ b/crates/elp/src/resources/test/eqwalizer_tests/check/callbacks3_neg-OTP-28.pretty
@@ -0,0 +1,14 @@
+error: incorrect_return_type_in_cb_implementation (See https://fb.me/eqwalizer_errors#incorrect_return_type_in_cb_implementation)
+   ┌─ check/src/callbacks3_neg.erl:12:1
+   │
+12 │ -behavior(gen_server).
+   │ ^^^^^^^^^^^^^^^^^^^^^
+   │ │
+   │ Incorrect return type for implementation of gen_server:handle_cast/2. Expected: {'noreply', term()} | {'noreply', term(), gen_server:action()} | {'stop', term(), term()}, Got: 'wrong_ret'.
+   │ 
+
+  'wrong_ret' is not compatible with {'noreply', term()} | {'noreply', term(), gen_server:action()} | {'stop', term(), term()}
+  because
+  'wrong_ret' is not compatible with {'noreply', term()}
+
+1 ERROR
diff --git a/crates/elp/src/resources/test/eqwalizer_tests/check/callbacks3_neg.pretty b/crates/elp/src/resources/test/eqwalizer_tests/check/callbacks3_neg.pretty
deleted file mode 100644
index 6cb2012096..0000000000
--- a/crates/elp/src/resources/test/eqwalizer_tests/check/callbacks3_neg.pretty
+++ /dev/null
@@ -1,27 +0,0 @@
-error: incorrect_return_type_in_cb_implementation (See https://fb.me/eqwalizer_errors#incorrect_return_type_in_cb_implementation)
-   ┌─ check/src/callbacks3_neg.erl:13:1
-   │
-13 │ -behavior(gen_server).
-   │ ^^^^^^^^^^^^^^^^^^^^^ Incorrect return type for implementation of gen_server:handle_cast/2.
-Expected: {'noreply', term()} | {'noreply', term(), timeout() | 'hibernate' | {'continue', term()}} | {'stop', term(), term()}
-Got:      'wrong_ret'
-
-error: incorrect_return_type_in_cb_implementation (See https://fb.me/eqwalizer_errors#incorrect_return_type_in_cb_implementation)
-   ┌─ check/src/callbacks3_neg.erl:13:1
-   │
-13 │ -behavior(gen_server).
-   │ ^^^^^^^^^^^^^^^^^^^^^
-   │ │
-   │ Incorrect return type for implementation of gen_server:handle_info/2.
-Expected: {'noreply', term()} | {'noreply', term(), timeout() | 'hibernate' | {'continue', term()}} | {'stop', term(), term()}
-Got:      {'noreply', 'ok', 'wrong_atom'}
-   │ 
-
-Because in the expression's type:
-  { 'noreply', 'ok', 
-    Here the type is:     'wrong_atom'
-    Context expects type: 'infinity' | number() | 'hibernate' | {'continue', term()}
-    No candidate matches in the expected union.
-  }
-
-2 ERRORS
diff --git a/crates/elp/src/resources/test/eqwalizer_tests/check/custom-OTP-26.pretty b/crates/elp/src/resources/test/eqwalizer_tests/check/custom-OTP-26.pretty
new file mode 100644
index 0000000000..370f7689e9
--- /dev/null
+++ b/crates/elp/src/resources/test/eqwalizer_tests/check/custom-OTP-26.pretty
@@ -0,0 +1,3258 @@
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+   ┌─ check/src/custom.erl:26:5
+   │
+26 │     element(4, Tup).
+   │     ^^^^^^^^^^^^^^^ erlang:element(4, Tup).
+Expression has type:   #{dynamic() => dynamic()}
+Context expected type: atom()
+
+error: index_out_of_bounds (See https://fb.me/eqwalizer_errors#index_out_of_bounds)
+   ┌─ check/src/custom.erl:30:5
+   │
+30 │     element(42, Tup).
+   │     ^^^^^^^^^^^^^^^^ 42.
+Tried to access element 42 of a tuple with 3 elements
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+   ┌─ check/src/custom.erl:40:5
+   │
+40 │     element(2, Tup).
+   │     ^^^^^^^^^^^^^^^ erlang:element(2, Tup).
+Expression has type:   number() | string() | atom()
+Context expected type: #{dynamic() => dynamic()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+   ┌─ check/src/custom.erl:44:16
+   │
+44 │     element(2, Tup).
+   │                ^^^
+   │                │
+   │                Tup.
+Expression has type:   {atom(), string()} | [dynamic()]
+Context expected type: tuple()
+   │                
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: {atom(), string()}
+  However the following candidate: [dynamic()]
+  Differs from the expected type:  tuple()
+
+------------------------------ Detailed message ------------------------------
+
+  {atom(), string()} | [dynamic()] is not compatible with tuple()
+  because
+  [dynamic()] is not compatible with tuple()
+
+error: index_out_of_bounds (See https://fb.me/eqwalizer_errors#index_out_of_bounds)
+   ┌─ check/src/custom.erl:48:5
+   │
+48 │     element(42, Tup).
+   │     ^^^^^^^^^^^^^^^^ 42.
+Tried to access element 42 of a tuple with 2 elements
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+   ┌─ check/src/custom.erl:54:5
+   │
+54 │     element(N, Tup).
+   │     ^^^^^^^^^^^^^^^ erlang:element(N, Tup).
+Expression has type:   atom() | number() | string()
+Context expected type: #{dynamic() => dynamic()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+   ┌─ check/src/custom.erl:58:5
+   │
+58 │     element(N, Tup).
+   │     ^^^^^^^^^^^^^^^
+   │     │
+   │     erlang:element(N, Tup).
+Expression has type:   atom() | number()
+Context expected type: atom()
+   │     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: atom()
+  However the following candidate: number()
+  Differs from the expected type:  atom()
+
+------------------------------ Detailed message ------------------------------
+
+  atom() | number() is not compatible with atom()
+  because
+  number() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+   ┌─ check/src/custom.erl:68:5
+   │
+68 │     element(1, Tup).
+   │     ^^^^^^^^^^^^^^^
+   │     │
+   │     erlang:element(1, Tup).
+Expression has type:   dynamic() | number()
+Context expected type: atom()
+   │     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: dynamic()
+  However the following candidate: number()
+  Differs from the expected type:  atom()
+
+------------------------------ Detailed message ------------------------------
+
+  dynamic() | number() is not compatible with atom()
+  because
+  number() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+   ┌─ check/src/custom.erl:86:5
+   │
+86 │     element(N, Rec).
+   │     ^^^^^^^^^^^^^^^
+   │     │
+   │     erlang:element(N, Rec).
+Expression has type:   'foo' | 'ok' | 'error' | number() | string()
+Context expected type: atom()
+   │     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: 'error' | 'foo' | 'ok'
+  However the following candidate: string()
+  Differs from the expected type:  atom()
+
+------------------------------ Detailed message ------------------------------
+
+  'foo' | 'ok' | 'error' | number() | string() is not compatible with atom()
+  because
+  string() is not compatible with atom()
+
+error: clause_not_covered (See https://fb.me/eqwalizer_errors#clause_not_covered)
+   ┌─ check/src/custom.erl:91:1
+   │  
+91 │ ╭ element_2_none_1(Tup) ->
+92 │ │     element(42, Tup).
+   │ ╰────────────────────^ Clause is not covered by spec
+
+error: clause_not_covered (See https://fb.me/eqwalizer_errors#clause_not_covered)
+   ┌─ check/src/custom.erl:95:1
+   │  
+95 │ ╭ element_2_none_2(N, Tup) ->
+96 │ │     element(N, Tup).
+   │ ╰───────────────────^ Clause is not covered by spec
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:108:5
+    │
+108 │     maps:get(K, M).
+    │     ^^^^^^^^^^^^^^ maps:get(K, M).
+Expression has type:   number()
+Context expected type: atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:128:5
+    │
+128 │     Res.
+    │     ^^^ Res.
+Expression has type:   number()
+Context expected type: atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:154:12
+    │
+154 │     get(a, M).
+    │            ^ M.
+Expression has type:   term()
+Context expected type: #{term() => term()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:160:23
+    │
+160 │     Res = maps:get(a, M),
+    │                       ^ M.
+Expression has type:   term()
+Context expected type: #{term() => term()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:167:17
+    │
+167 │     maps:get(a, M, false).
+    │                 ^ M.
+Expression has type:   term()
+Context expected type: #{term() => term()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:173:23
+    │
+173 │     Res = maps:get(a, M, false),
+    │                       ^ M.
+Expression has type:   term()
+Context expected type: #{term() => term()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:193:5
+    │
+193 │     maps:get(K, M, 0).
+    │     ^^^^^^^^^^^^^^^^^
+    │     │
+    │     maps:get(K, M, 0).
+Expression has type:   number() | atom()
+Context expected type: atom()
+    │     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: atom()
+  However the following candidate: number()
+  Differs from the expected type:  atom()
+
+------------------------------ Detailed message ------------------------------
+
+  number() | atom() is not compatible with atom()
+  because
+  number() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:200:5
+    │
+200 │     Res.
+    │     ^^^
+    │     │
+    │     Res.
+Expression has type:   number() | atom()
+Context expected type: atom()
+    │     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: atom()
+  However the following candidate: number()
+  Differs from the expected type:  atom()
+
+------------------------------ Detailed message ------------------------------
+
+  number() | atom() is not compatible with atom()
+  because
+  number() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:206:5
+    │    
+206 │ ╭ ╭     {
+207 │ │ │         maps:get(a, M, undefined),
+208 │ │ │         maps:get(n, M, undefined)
+209 │ │ │     }.
+    │ ╰─│─────^ {maps:get('a', M, 'undefined'), maps:get('n', M, 'undefined')}.
+Expression has type:   {atom(), 'undefined' | number()}
+Context expected type: {atom(), number()}
+    │   ╰─────' 
+
+Because in the expression's type:
+  { atom(), 
+    Here the type is a union type with some valid candidates: number()
+    However the following candidate: 'undefined'
+    Differs from the expected type:  number()
+  }
+
+------------------------------ Detailed message ------------------------------
+
+  at tuple index 2:
+  {atom(), 'undefined' | number()} is not compatible with {atom(), number()}
+  because
+  'undefined' | number() is not compatible with number()
+  because
+  'undefined' is not compatible with number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:221:27
+    │
+221 │ map_get_2_17_neg(V, M) -> maps:get(V, M).
+    │                           ^^^^^^^^^^^^^^
+    │                           │
+    │                           maps:get(V, M).
+Expression has type:   'a_v' | 'c_v'
+Context expected type: 'a_v' | 'b_v'
+    │                           
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: 'a_v'
+  However the following candidate: 'c_v'
+  Differs from the expected type:  'a_v' | 'b_v'
+
+------------------------------ Detailed message ------------------------------
+
+  'a_v' | 'c_v' is not compatible with 'a_v' | 'b_v'
+  because
+  'c_v' is not compatible with 'a_v' | 'b_v'
+  because
+  'c_v' is not compatible with 'a_v'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:233:27
+    │
+233 │ map_get_3_19_neg(V, M) -> maps:get(V, M, undefined).
+    │                           ^^^^^^^^^^^^^^^^^^^^^^^^^
+    │                           │
+    │                           maps:get(V, M, 'undefined').
+Expression has type:   'undefined' | 'a_v' | 'c_v'
+Context expected type: 'a_v' | 'b_v' | 'undefined'
+    │                           
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: 'undefined' | 'a_v'
+  However the following candidate: 'c_v'
+  Differs from the expected type:  'a_v' | 'b_v' | 'undefined'
+
+------------------------------ Detailed message ------------------------------
+
+  'undefined' | 'a_v' | 'c_v' is not compatible with 'a_v' | 'b_v' | 'undefined'
+  because
+  'c_v' is not compatible with 'a_v' | 'b_v' | 'undefined'
+  because
+  'c_v' is not compatible with 'a_v'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:309:5
+    │
+309 │     Res.
+    │     ^^^ Res.
+Expression has type:   {'value', #{}} | 'false'
+Context expected type: 'nok'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:363:23
+    │
+363 │         fun (_, _) -> self() end,
+    │                       ^^^^^^ erlang:self().
+Expression has type:   pid()
+Context expected type: boolean()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:382:17
+    │
+382 │     maps:filter(F, M).
+    │                 ^ F.
+Expression has type:   fun(() -> pid())
+Context expected type: fun((number(), 'a' | 'b') -> boolean())
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:389:17
+    │
+389 │     maps:filter(F, M).
+    │                 ^
+    │                 │
+    │                 F.
+Expression has type:   fun((fun((T) -> boolean()), [T]) -> [T]) with 1 type parameter
+Context expected type: fun((number(), 'a' | 'b') -> boolean()) with 0 type parameters
+    │                 
+
+Because in the expression's type:
+  Here the type is:     fun()/2 with 1 type parameter
+  Context expects type: fun((number(), 'a' | 'b') -> boolean()) with 0 type parameters
+  The number of type parameters doesn't match.
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:413:37
+    │
+413 │     maps:filter(fun erlang:'=:='/2, X).
+    │                                     ^
+    │                                     │
+    │                                     X.
+Expression has type:   #{K => V} | 'a'
+Context expected type: #{term() => term()} | maps:iterator()
+    │                                     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: #{K => V}
+  However the following candidate: 'a'
+  Differs from the expected type:  #{term() => term()} | maps:iterator()
+
+------------------------------ Detailed message ------------------------------
+
+  #{K => V} | 'a' is not compatible with #{term() => term()} | maps:iterator()
+  because
+  'a' is not compatible with #{term() => term()} | maps:iterator()
+  because
+  'a' is not compatible with #{term() => term()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:425:20
+    │
+425 │     maps:filter(F, non_kv),
+    │                    ^^^^^^
+    │                    │
+    │                    'non_kv'.
+Expression has type:   'non_kv'
+Context expected type: #{term() => term()} | maps:iterator()
+    │                    
+
+  'non_kv' is not compatible with #{term() => term()} | maps:iterator()
+  because
+  'non_kv' is not compatible with #{term() => term()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:454:5
+    │    
+454 │ ╭ ╭     maps:map(
+455 │ │ │         fun (_, _) -> self() end,
+456 │ │ │         M
+457 │ │ │     ).
+    │ ╰─│─────^ maps:map(fun, M).
+Expression has type:   #{number() => pid()}
+Context expected type: #{number() => boolean()}
+    │   ╰─────' 
+
+Because in the expression's type:
+  #{ number() =>
+    Here the type is:     pid()
+    Context expects type: boolean()
+  , ... }
+
+------------------------------ Detailed message ------------------------------
+
+  #{number() => pid()} is not compatible with #{number() => boolean()}
+  the default associations are not compatible
+  because
+  pid() is not compatible with boolean()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:474:14
+    │
+474 │     maps:map(F, M).
+    │              ^ F.
+Expression has type:   fun(() -> pid())
+Context expected type: fun((number(), 'a' | 'b') -> term())
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:481:14
+    │
+481 │     maps:map(F, M).
+    │              ^
+    │              │
+    │              F.
+Expression has type:   fun((fun((A) -> B), [A]) -> [B]) with 2 type parameters
+Context expected type: fun((number(), 'a' | 'b') -> term()) with 0 type parameters
+    │              
+
+Because in the expression's type:
+  Here the type is:     fun((fun((A) -> B), [A]) -> [B]) with 2 type parameters
+  Context expects type: fun((number(), 'a' | 'b') -> term()) with 0 type parameters
+  The number of type parameters doesn't match.
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:497:5
+    │
+497 │     maps:map(F, M).
+    │     ^^^^^^^^^^^^^^
+    │     │
+    │     maps:map(F, M).
+Expression has type:   #{a := boolean(), b := boolean()}
+Context expected type: #{a => 'a', b => 'b'}
+    │     
+
+Because in the expression's type:
+  #{ a =>
+    Here the type is:     boolean()
+    Context expects type: 'a'
+  , ... }
+
+------------------------------ Detailed message ------------------------------
+
+  #{a := boolean(), b := boolean()} is not compatible with #{a => 'a', b => 'b'}
+  because
+  at key `a`:
+  #{a := boolean(), b := boolean()} is not compatible with #{a => 'a', b => 'b'}
+  because
+  boolean() is not compatible with 'a'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:503:17
+    │
+503 │     maps:map(F, non_kv),
+    │                 ^^^^^^
+    │                 │
+    │                 'non_kv'.
+Expression has type:   'non_kv'
+Context expected type: #{term() => term()} | maps:iterator()
+    │                 
+
+  'non_kv' is not compatible with #{term() => term()} | maps:iterator()
+  because
+  'non_kv' is not compatible with #{term() => term()}
+
+error: fun_arity_mismatch (See https://fb.me/eqwalizer_errors#fun_arity_mismatch)
+    ┌─ check/src/custom.erl:538:9
+    │
+538 │         fun (K, V) -> [K, V] end, [], M).
+    │         ^^^^^^^^^^^^^^^^^^^^^^^^ fun.
+fun with arity 2 used as fun with 3 arguments
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:544:5
+    │    
+544 │ ╭ ╭     maps:fold(
+545 │ │ │         fun (_, _, Acc) -> [Acc] end,
+546 │ │ │         [],
+547 │ │ │         M
+548 │ │ │     ).
+    │ ╰─│─────^ maps:fold(fun, [], M).
+Expression has type:   [[[]]]
+Context expected type: [number() | 'a' | 'b']
+    │   ╰─────' 
+
+Because in the expression's type:
+  [
+    Here the type is:     [[]]
+    Context expects type: number() | 'a' | 'b'
+    No candidate matches in the expected union.
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [[[]]] is not compatible with [number() | 'a' | 'b']
+  because
+  [[]] is not compatible with number() | 'a' | 'b'
+  because
+  [[]] is not compatible with number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:545:28
+    │
+545 │         fun (_, _, Acc) -> [Acc] end,
+    │                            ^^^^^
+    │                            │
+    │                            [Acc].
+Expression has type:   [[[[]]]]
+Context expected type: [[[]]]
+    │                            
+
+Because in the expression's type:
+  [
+    [
+      [
+        Here the type is:     []
+        Context expects type: none()
+      ]
+    ]
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [[[[]]]] is not compatible with [[[]]]
+  because
+  [[[]]] is not compatible with [[]]
+  because
+  [[]] is not compatible with []
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:552:5
+    │  
+552 │ ╭     maps:fold(
+553 │ │         fun (_, _, Acc) -> Acc end,
+554 │ │         [],
+555 │ │         non_kv
+556 │ │     ).
+    │ ╰─────^ maps:fold(fun, [], 'non_kv').
+Expression has type:   []
+Context expected type: 'nok'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:555:9
+    │
+555 │         non_kv
+    │         ^^^^^^
+    │         │
+    │         'non_kv'.
+Expression has type:   'non_kv'
+Context expected type: #{term() => term()} | maps:iterator()
+    │         
+
+  'non_kv' is not compatible with #{term() => term()} | maps:iterator()
+  because
+  'non_kv' is not compatible with #{term() => term()}
+
+error: clause_not_covered (See https://fb.me/eqwalizer_errors#clause_not_covered)
+    ┌─ check/src/custom.erl:560:1
+    │  
+560 │ ╭ maps_fold_3_6(None) ->
+561 │ │     maps:fold(
+562 │ │         None,
+563 │ │         #{},
+564 │ │         #{1 => 1}
+565 │ │     ).
+    │ ╰─────^ Clause is not covered by spec
+
+error: clause_not_covered (See https://fb.me/eqwalizer_errors#clause_not_covered)
+    ┌─ check/src/custom.erl:568:1
+    │  
+568 │ ╭ maps_fold_3_7(None) ->
+569 │ │     maps:fold(
+570 │ │         None,
+571 │ │         None,
+572 │ │         None
+573 │ │     ).
+    │ ╰─────^ Clause is not covered by spec
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:578:5
+    │    
+578 │ ╭ ╭     maps:fold(
+579 │ │ │         fun (_K, A, _Acc) -> A end,
+580 │ │ │         [],
+581 │ │ │         M
+582 │ │ │     ).
+    │ ╰─│─────^ maps:fold(fun, [], M).
+Expression has type:   [] | atom()
+Context expected type: atom()
+    │   ╰─────' 
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: atom()
+  However the following candidate: []
+  Differs from the expected type:  atom()
+
+------------------------------ Detailed message ------------------------------
+
+  [] | atom() is not compatible with atom()
+  because
+  [] is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:601:9
+    │
+601 │         fun folder_bad/3,
+    │         ^^^^^^^^^^^^^^^^
+    │         │
+    │         folder_bad/3.
+Expression has type:   fun((term(), term(), Acc) -> [Acc]) with 1 type parameter
+Context expected type: fun((number(), 'a', []) -> term()) with 0 type parameters
+    │         
+
+Because in the expression's type:
+  Here the type is:     fun((term(), term(), Acc) -> [Acc]) with 1 type parameter
+  Context expects type: fun((number(), 'a', []) -> term()) with 0 type parameters
+  The number of type parameters doesn't match.
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:601:9
+    │
+601 │         fun folder_bad/3,
+    │         ^^^^^^^^^^^^^^^^
+    │         │
+    │         folder_bad/3.
+Expression has type:   fun((term(), term(), Acc) -> [Acc]) with 1 type parameter
+Context expected type: fun((number(), 'a', [] | dynamic()) -> term()) with 0 type parameters
+    │         
+
+Because in the expression's type:
+  Here the type is:     fun((term(), term(), Acc) -> [Acc]) with 1 type parameter
+  Context expects type: fun()/3 with 0 type parameters
+  The number of type parameters doesn't match.
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:601:9
+    │
+601 │         fun folder_bad/3,
+    │         ^^^^^^^^^^^^^^^^
+    │         │
+    │         folder_bad/3.
+Expression has type:   fun((term(), term(), Acc) -> [Acc]) with 1 type parameter
+Context expected type: fun((number(), 'a', [] | dynamic()) -> [] | dynamic()) with 0 type parameters
+    │         
+
+Because in the expression's type:
+  Here the type is:     fun((term(), term(), Acc) -> [Acc]) with 1 type parameter
+  Context expects type: fun()/3 with 0 type parameters
+  The number of type parameters doesn't match.
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:636:5
+    │    
+636 │ ╭ ╭     maps:fold(
+637 │ │ │         fun
+638 │ │ │             (_K, {i, I}, Acc) ->
+639 │ │ │                 [I | Acc];
+    · │ │
+646 │ │ │         M
+647 │ │ │     ).
+    │ ╰─│─────^ maps:fold(fun, [], M).
+Expression has type:   [number() | binary() | atom()]
+Context expected type: [binary()] | [number()] | [atom()]
+    │   ╰─────' 
+
+Because in the expression's type:
+  [
+    Here the type is a union type with some valid candidates: binary()
+    However the following candidate: number()
+    Differs from the expected type:  binary()
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [number() | binary() | atom()] is not compatible with [binary()] | [number()] | [atom()]
+  because
+  [number() | binary() | atom()] is not compatible with [binary()]
+  because
+  number() | binary() | atom() is not compatible with binary()
+  because
+  number() is not compatible with binary()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:671:41
+    │
+671 │ maps_to_list_7_neg(Num) -> maps:to_list(Num).
+    │                                         ^^^
+    │                                         │
+    │                                         Num.
+Expression has type:   number()
+Context expected type: #{term() => term()} | maps:iterator()
+    │                                         
+
+  number() is not compatible with #{term() => term()} | maps:iterator()
+  because
+  number() is not compatible with #{term() => term()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:675:25
+    │
+675 │ maps_merge_1(M1, M2) -> maps:merge(M1, M2).
+    │                         ^^^^^^^^^^^^^^^^^^
+    │                         │
+    │                         maps:merge(M1, M2).
+Expression has type:   #{'b' | 'a' | 'c' => number() | string() | atom()}
+Context expected type: #{a => string(), b => number(), c => atom()}
+    │                         
+
+Because in the expression's type:
+  Here the type is:     #{'b' | 'a' | 'c' => number() | string() | atom()}
+  Context expects type: #{...} (no default association)
+  The expected map has no default association while the type of the expression has one.
+
+------------------------------ Detailed message ------------------------------
+
+  #{'b' | 'a' | 'c' => number() | string() | atom()} is not compatible with #{a => string(), b => number(), c => atom()}
+  key a is not present in the former map but is incompatible with its default association
+  because
+  number() | string() | atom() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:679:25
+    │
+679 │ maps_merge_2(M1, M2) -> maps:merge(M1, M2).
+    │                         ^^^^^^^^^^^^^^^^^^
+    │                         │
+    │                         maps:merge(M1, M2).
+Expression has type:   #{'b' | 'a' | 'c' => number() | string() | atom()}
+Context expected type: #{a => string(), b => number() | boolean(), c => atom()}
+    │                         
+
+Because in the expression's type:
+  Here the type is:     #{'b' | 'a' | 'c' => number() | string() | atom()}
+  Context expects type: #{...} (no default association)
+  The expected map has no default association while the type of the expression has one.
+
+------------------------------ Detailed message ------------------------------
+
+  #{'b' | 'a' | 'c' => number() | string() | atom()} is not compatible with #{a => string(), b => number() | boolean(), c => atom()}
+  key a is not present in the former map but is incompatible with its default association
+  because
+  number() | string() | atom() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:683:25
+    │
+683 │ maps_merge_3(M1, M2) -> maps:merge(M1, M2).
+    │                         ^^^^^^^^^^^^^^^^^^
+    │                         │
+    │                         maps:merge(M1, M2).
+Expression has type:   #{'b' | 'a' | 'c' => number() | string() | atom()}
+Context expected type: #{a := string(), b := boolean(), c => atom()}
+    │                         
+
+Because in the expression's type:
+  Here the type is:     #{...}
+  Context expects type: #{a := ..., b := ..., ...}
+  The type of the expression is missing the following required keys: a, b.
+
+------------------------------ Detailed message ------------------------------
+
+keys `a`, `b` are declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:697:44
+    │
+697 │ maps_merge_7_neg(M1, M2) -> maps:merge(M1, M2).
+    │                                            ^^ M2.
+Expression has type:   number()
+Context expected type: #{a => binary()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:701:25
+    │
+701 │ maps_merge_8(M1, M2) -> maps:merge(M1, M2).
+    │                         ^^^^^^^^^^^^^^^^^^
+    │                         │
+    │                         maps:merge(M1, M2).
+Expression has type:   #{'a' | 'b' => atom() | number()}
+Context expected type: #{a := atom(), b := number()} | #{a := atom()}
+    │                         
+
+Because in the expression's type:
+  Here the type is:     #{...}
+  Context expects type: #{a := ..., b := ..., ...}
+  The type of the expression is missing the following required keys: a, b.
+
+------------------------------ Detailed message ------------------------------
+
+  #{'a' | 'b' => atom() | number()} is not compatible with #{a := atom(), b := number()} | #{a := atom()}
+  because
+  #{'a' | 'b' => atom() | number()} is not compatible with #{a := atom(), b := number()}
+  keys `a`, `b` are declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:721:9
+    │
+721 │         fun erlang:binary_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:binary_to_list/1.
+Expression has type:   fun((binary()) -> [number()])
+Context expected type: fun((number()) -> boolean() | {'true', term()})
+    │         
+
+Because in the expression's type:
+  fun((binary()) ->
+    Here the type is:     [number()]
+    Context expects type: 'false' | 'true' | {'true', term()}
+    No candidate matches in the expected union.
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((binary()) -> [number()]) is not compatible with fun((number()) -> boolean() | {'true', term()})
+  because
+  [number()] is not compatible with boolean() | {'true', term()}
+  because
+  [number()] is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:739:20
+    │
+739 │             (3) -> wrong_ret end,
+    │                    ^^^^^^^^^
+    │                    │
+    │                    'wrong_ret'.
+Expression has type:   'wrong_ret'
+Context expected type: boolean() | {'true', term()}
+    │                    
+
+Because in the expression's type:
+  Here the type is:     'wrong_ret'
+  Context expects type: 'false' | 'true' | {'true', term()}
+  No candidate matches in the expected union.
+
+------------------------------ Detailed message ------------------------------
+
+  'wrong_ret' is not compatible with boolean() | {'true', term()}
+  because
+  'wrong_ret' is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:749:9
+    │
+749 │         not_a_list
+    │         ^^^^^^^^^^ 'not_a_list'.
+Expression has type:   'not_a_list'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:791:17
+    │
+791 │                 Res
+    │                 ^^^
+    │                 │
+    │                 Res.
+Expression has type:   {'true', 'a'} | 'wrong_ret'
+Context expected type: boolean() | {'true', term()}
+    │                 
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: {'true', 'a'}
+  However the following candidate: 'wrong_ret'
+  Differs from the expected type:  'false' | 'true' | {'true', term()}
+
+------------------------------ Detailed message ------------------------------
+
+  {'true', 'a'} | 'wrong_ret' is not compatible with boolean() | {'true', term()}
+  because
+  'wrong_ret' is not compatible with boolean() | {'true', term()}
+  because
+  'wrong_ret' is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:827:9
+    │    
+827 │ ╭ ╭         fun (a) -> [a];
+828 │ │ │             (b) -> true;
+829 │ │ │             (c) -> wrong_ret end,
+    │ ╰─│────────────────────────────────^ fun.
+Expression has type:   fun(('a' | 'b') -> ['a'] | 'true' | 'wrong_ret')
+Context expected type: fun(('a' | 'b') -> boolean() | ['a' | 'b'])
+    │   ╰────────────────────────────────' 
+
+Because in the expression's type:
+  fun(('a' | 'b') ->
+    Here the type is a union type with some valid candidates: ['a'] | 'true'
+    However the following candidate: 'wrong_ret'
+    Differs from the expected type:  'false' | 'true' | ['a' | 'b']
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun(('a' | 'b') -> ['a'] | 'true' | 'wrong_ret') is not compatible with fun(('a' | 'b') -> boolean() | ['a' | 'b'])
+  because
+  ['a'] | 'true' | 'wrong_ret' is not compatible with boolean() | ['a' | 'b']
+  because
+  'wrong_ret' is not compatible with boolean() | ['a' | 'b']
+  because
+  'wrong_ret' is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:829:20
+    │
+829 │             (c) -> wrong_ret end,
+    │                    ^^^^^^^^^
+    │                    │
+    │                    'wrong_ret'.
+Expression has type:   'wrong_ret'
+Context expected type: boolean() | ['a' | 'b']
+    │                    
+
+Because in the expression's type:
+  Here the type is:     'wrong_ret'
+  Context expects type: 'false' | 'true' | ['a' | 'b']
+  No candidate matches in the expected union.
+
+------------------------------ Detailed message ------------------------------
+
+  'wrong_ret' is not compatible with boolean() | ['a' | 'b']
+  because
+  'wrong_ret' is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:837:9
+    │    
+837 │ ╭ ╭         fun (1) -> {true, a};
+838 │ │ │             (2) -> true end,
+    │ ╰─│───────────────────────────^ fun.
+Expression has type:   fun((dynamic()) -> {'true', 'a'} | 'true')
+Context expected type: fun((Item) -> boolean() | [Item])
+    │   ╰───────────────────────────' 
+
+Because in the expression's type:
+  fun((dynamic()) ->
+    Here the type is a union type with some valid candidates: 'true'
+    However the following candidate: {'true', 'a'}
+    Differs from the expected type:  'false' | 'true' | [Item]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((dynamic()) -> {'true', 'a'} | 'true') is not compatible with fun((Item) -> boolean() | [Item])
+  because
+  {'true', 'a'} | 'true' is not compatible with boolean() | [Item]
+  because
+  {'true', 'a'} is not compatible with boolean() | [Item]
+  expected union does not contain any tuple type of size 2
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:837:20
+    │
+837 │         fun (1) -> {true, a};
+    │                    ^^^^^^^^^
+    │                    │
+    │                    {'true', 'a'}.
+Expression has type:   {'true', 'a'}
+Context expected type: boolean() | [dynamic()]
+    │                    
+
+Because in the expression's type:
+  Here the type is:     {'true', 'a'}
+  Context expects type: 'false' | 'true' | [dynamic()]
+  No candidate matches in the expected union.
+
+------------------------------ Detailed message ------------------------------
+
+expected union does not contain any tuple type of size 2
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:839:9
+    │
+839 │         not_a_queue
+    │         ^^^^^^^^^^^
+    │         │
+    │         'not_a_queue'.
+Expression has type:   'not_a_queue'
+Context expected type: queue:queue(Item)
+    │         
+
+Because in the expression's type:
+  Here the type is:     'not_a_queue'
+  Context expects type: {[Item], [Item]}
+
+------------------------------ Detailed message ------------------------------
+
+  'not_a_queue' is not compatible with queue:queue(Item)
+  because
+  'not_a_queue' is not compatible with {[Item], [Item]}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:839:9
+    │
+839 │         not_a_queue
+    │         ^^^^^^^^^^^
+    │         │
+    │         'not_a_queue'.
+Expression has type:   'not_a_queue'
+Context expected type: queue:queue(dynamic())
+    │         
+
+Because in the expression's type:
+  Here the type is:     'not_a_queue'
+  Context expects type: {[dynamic()], [dynamic()]}
+
+------------------------------ Detailed message ------------------------------
+
+  'not_a_queue' is not compatible with queue:queue(dynamic())
+  because
+  'not_a_queue' is not compatible with {[dynamic()], [dynamic()]}
+
+error: fun_arity_mismatch (See https://fb.me/eqwalizer_errors#fun_arity_mismatch)
+    ┌─ check/src/custom.erl:846:9
+    │  
+846 │ ╭         fun (wrong, arity) ->
+847 │ │             [a]
+848 │ │         end,
+    │ ╰───────────^ fun.
+fun with arity 2 used as fun with 1 arguments
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:857:9
+    │    
+857 │ ╭ ╭         fun (1) -> {true, a};
+858 │ │ │             (X) -> case X of
+859 │ │ │                        true ->
+860 │ │ │                            [a];
+    · │ │
+863 │ │ │                    end
+864 │ │ │         end,
+    │ ╰─│───────────^ fun.
+Expression has type:   fun(('a' | 'b') -> ['a'] | 'false' | {'true', 'a'})
+Context expected type: fun(('a' | 'b') -> boolean() | ['a' | 'b'])
+    │   ╰───────────' 
+
+Because in the expression's type:
+  fun(('a' | 'b') ->
+    Here the type is a union type with some valid candidates: ['a'] | 'false'
+    However the following candidate: {'true', 'a'}
+    Differs from the expected type:  'false' | 'true' | ['a' | 'b']
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun(('a' | 'b') -> ['a'] | 'false' | {'true', 'a'}) is not compatible with fun(('a' | 'b') -> boolean() | ['a' | 'b'])
+  because
+  ['a'] | 'false' | {'true', 'a'} is not compatible with boolean() | ['a' | 'b']
+  because
+  {'true', 'a'} is not compatible with boolean() | ['a' | 'b']
+  expected union does not contain any tuple type of size 2
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:857:20
+    │
+857 │         fun (1) -> {true, a};
+    │                    ^^^^^^^^^
+    │                    │
+    │                    {'true', 'a'}.
+Expression has type:   {'true', 'a'}
+Context expected type: boolean() | ['a' | 'b']
+    │                    
+
+Because in the expression's type:
+  Here the type is:     {'true', 'a'}
+  Context expects type: 'false' | 'true' | ['a' | 'b']
+  No candidate matches in the expected union.
+
+------------------------------ Detailed message ------------------------------
+
+expected union does not contain any tuple type of size 2
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:873:9
+    │    
+873 │ ╭ ╭         fun (a) -> [a];
+874 │ │ │             (X) ->
+875 │ │ │                 Res = case X of
+876 │ │ │                           true ->
+    · │ │
+881 │ │ │                 Res
+882 │ │ │         end,
+    │ ╰─│───────────^ fun.
+Expression has type:   fun(('a' | 'b') -> ['a'] | 'wrong_ret')
+Context expected type: fun(('a' | 'b') -> boolean() | ['a' | 'b'])
+    │   ╰───────────' 
+
+Because in the expression's type:
+  fun(('a' | 'b') ->
+    Here the type is a union type with some valid candidates: ['a']
+    However the following candidate: 'wrong_ret'
+    Differs from the expected type:  'false' | 'true' | ['a' | 'b']
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun(('a' | 'b') -> ['a'] | 'wrong_ret') is not compatible with fun(('a' | 'b') -> boolean() | ['a' | 'b'])
+  because
+  ['a'] | 'wrong_ret' is not compatible with boolean() | ['a' | 'b']
+  because
+  'wrong_ret' is not compatible with boolean() | ['a' | 'b']
+  because
+  'wrong_ret' is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:881:17
+    │
+881 │                 Res
+    │                 ^^^
+    │                 │
+    │                 Res.
+Expression has type:   ['a'] | 'wrong_ret'
+Context expected type: boolean() | ['a' | 'b']
+    │                 
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: ['a']
+  However the following candidate: 'wrong_ret'
+  Differs from the expected type:  'false' | 'true' | ['a' | 'b']
+
+------------------------------ Detailed message ------------------------------
+
+  ['a'] | 'wrong_ret' is not compatible with boolean() | ['a' | 'b']
+  because
+  'wrong_ret' is not compatible with boolean() | ['a' | 'b']
+  because
+  'wrong_ret' is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:891:9
+    │
+891 │         fun list_to_atom/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:list_to_atom/1.
+Expression has type:   fun((string()) -> atom())
+Context expected type: fun((dynamic()) -> boolean() | [dynamic()])
+    │         
+
+Because in the expression's type:
+  fun((string()) ->
+    Here the type is:     atom()
+    Context expects type: 'false' | 'true' | [dynamic()]
+    No candidate matches in the expected union.
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((string()) -> atom()) is not compatible with fun((dynamic()) -> boolean() | [dynamic()])
+  because
+  atom() is not compatible with boolean() | [dynamic()]
+  because
+  atom() is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:891:9
+    │
+891 │         fun list_to_atom/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:list_to_atom/1.
+Expression has type:   fun((string()) -> atom())
+Context expected type: fun(('a' | 'b') -> boolean() | ['a' | 'b'])
+    │         
+
+Because in the expression's type:
+  fun((string()) ->
+    Here the type is:     atom()
+    Context expects type: 'false' | 'true' | ['a' | 'b']
+    No candidate matches in the expected union.
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((string()) -> atom()) is not compatible with fun(('a' | 'b') -> boolean() | ['a' | 'b'])
+  because
+  atom() is not compatible with boolean() | ['a' | 'b']
+  because
+  atom() is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:900:9
+    │
+900 │         fun atom_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:atom_to_list/1.
+Expression has type:   fun((atom()) -> string())
+Context expected type: fun((atom()) -> boolean() | [atom()])
+    │         
+
+Because in the expression's type:
+  fun((atom()) ->
+    Here the type is:     string()
+    Context expects type: boolean() | [atom()]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((atom()) -> string()) is not compatible with fun((atom()) -> boolean() | [atom()])
+  because
+  string() is not compatible with boolean() | [atom()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:900:9
+    │
+900 │         fun atom_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:atom_to_list/1.
+Expression has type:   fun((atom()) -> string())
+Context expected type: fun((dynamic(atom())) -> boolean() | [dynamic(atom())])
+    │         
+
+Because in the expression's type:
+  fun((atom()) ->
+    Here the type is:     string()
+    Context expects type: boolean() | [dynamic(atom())]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((atom()) -> string()) is not compatible with fun((dynamic(atom())) -> boolean() | [dynamic(atom())])
+  because
+  string() is not compatible with boolean() | [dynamic(atom())]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:909:9
+    │
+909 │         fun atom_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:atom_to_list/1.
+Expression has type:   fun((atom()) -> string())
+Context expected type: fun((atom()) -> boolean() | [atom()])
+    │         
+
+Because in the expression's type:
+  fun((atom()) ->
+    Here the type is:     string()
+    Context expects type: boolean() | [atom()]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((atom()) -> string()) is not compatible with fun((atom()) -> boolean() | [atom()])
+  because
+  string() is not compatible with boolean() | [atom()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:909:9
+    │
+909 │         fun atom_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:atom_to_list/1.
+Expression has type:   fun((atom()) -> string())
+Context expected type: fun((dynamic(atom())) -> boolean() | [dynamic(atom())])
+    │         
+
+Because in the expression's type:
+  fun((atom()) ->
+    Here the type is:     string()
+    Context expects type: boolean() | [dynamic(atom())]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((atom()) -> string()) is not compatible with fun((dynamic(atom())) -> boolean() | [dynamic(atom())])
+  because
+  string() is not compatible with boolean() | [dynamic(atom())]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:919:9
+    │
+919 │         fun atom_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:atom_to_list/1.
+Expression has type:   fun((atom()) -> string())
+Context expected type: fun((atom()) -> boolean() | [atom()])
+    │         
+
+Because in the expression's type:
+  fun((atom()) ->
+    Here the type is:     string()
+    Context expects type: boolean() | [atom()]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((atom()) -> string()) is not compatible with fun((atom()) -> boolean() | [atom()])
+  because
+  string() is not compatible with boolean() | [atom()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:919:9
+    │
+919 │         fun atom_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:atom_to_list/1.
+Expression has type:   fun((atom()) -> string())
+Context expected type: fun((dynamic(atom())) -> boolean() | [dynamic(atom())])
+    │         
+
+Because in the expression's type:
+  fun((atom()) ->
+    Here the type is:     string()
+    Context expects type: boolean() | [dynamic(atom())]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((atom()) -> string()) is not compatible with fun((dynamic(atom())) -> boolean() | [dynamic(atom())])
+  because
+  string() is not compatible with boolean() | [dynamic(atom())]
+
+error: clause_not_covered (See https://fb.me/eqwalizer_errors#clause_not_covered)
+    ┌─ check/src/custom.erl:925:1
+    │  
+925 │ ╭ queue_filter_13_neg(Q) ->
+926 │ │     queue:filter(
+927 │ │         fun atom_to_list/1,
+928 │ │         Q
+929 │ │     ),
+930 │ │     ok.
+    │ ╰──────^ Clause is not covered by spec
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:927:9
+    │
+927 │         fun atom_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:atom_to_list/1.
+Expression has type:   fun((atom()) -> string())
+Context expected type: fun((atom()) -> boolean() | [atom()])
+    │         
+
+Because in the expression's type:
+  fun((atom()) ->
+    Here the type is:     string()
+    Context expects type: boolean() | [atom()]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((atom()) -> string()) is not compatible with fun((atom()) -> boolean() | [atom()])
+  because
+  string() is not compatible with boolean() | [atom()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:927:9
+    │
+927 │         fun atom_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:atom_to_list/1.
+Expression has type:   fun((atom()) -> string())
+Context expected type: fun((dynamic(atom())) -> boolean() | [dynamic(atom())])
+    │         
+
+Because in the expression's type:
+  fun((atom()) ->
+    Here the type is:     string()
+    Context expects type: boolean() | [dynamic(atom())]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((atom()) -> string()) is not compatible with fun((dynamic(atom())) -> boolean() | [dynamic(atom())])
+  because
+  string() is not compatible with boolean() | [dynamic(atom())]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:955:5
+    │  
+955 │ ╭     lists:keystore(
+956 │ │         a, 1,
+957 │ │         [{foo, b}, {c, d}],
+958 │ │         non_tuple
+959 │ │     ).
+    │ ╰─────^ lists:keystore('a', 1, [{'foo', 'b'}, {'c', 'd'}], 'non_tuple').
+Expression has type:   [{'foo', 'b'} | {'c', 'd'} | dynamic()]
+Context expected type: 'nok'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:958:9
+    │
+958 │         non_tuple
+    │         ^^^^^^^^^ 'non_tuple'.
+Expression has type:   'non_tuple'
+Context expected type: tuple()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:966:5
+    │  
+966 │ ╭     lists:keystore(
+967 │ │         a, 1,
+968 │ │         [non_tuple],
+969 │ │         {replacement}
+970 │ │     ).
+    │ ╰─────^ lists:keystore('a', 1, ['non_tuple'], {'replacement'}).
+Expression has type:   [dynamic() | {'replacement'}]
+Context expected type: 'nok'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:968:9
+    │
+968 │         [non_tuple],
+    │         ^^^^^^^^^^^
+    │         │
+    │         ['non_tuple'].
+Expression has type:   ['non_tuple']
+Context expected type: [tuple()]
+    │         
+
+Because in the expression's type:
+  [
+    Here the type is:     'non_tuple'
+    Context expects type: tuple()
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  ['non_tuple'] is not compatible with [tuple()]
+  because
+  'non_tuple' is not compatible with tuple()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:975:5
+    │  
+975 │ ╭     lists:keystore(
+976 │ │         a, 1,
+977 │ │         non_list,
+978 │ │         {replacement}
+979 │ │     ).
+    │ ╰─────^ lists:keystore('a', 1, 'non_list', {'replacement'}).
+Expression has type:   [dynamic() | {'replacement'}]
+Context expected type: 'nok'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:977:9
+    │
+977 │         non_list,
+    │         ^^^^^^^^ 'non_list'.
+Expression has type:   'non_list'
+Context expected type: [tuple()]
+
+error: clause_not_covered (See https://fb.me/eqwalizer_errors#clause_not_covered)
+    ┌─ check/src/custom.erl:983:1
+    │  
+983 │ ╭ keystore_7(None) ->
+984 │ │     lists:keystore(
+985 │ │         a, 1,
+986 │ │         None,
+987 │ │         {replacement}
+988 │ │     ).
+    │ ╰─────^ Clause is not covered by spec
+
+error: clause_not_covered (See https://fb.me/eqwalizer_errors#clause_not_covered)
+    ┌─ check/src/custom.erl:991:1
+    │  
+991 │ ╭ keystore_8(None) ->
+992 │ │     lists:keystore(
+993 │ │         a, 1,
+994 │ │         None,
+995 │ │         None
+996 │ │     ).
+    │ ╰─────^ Clause is not covered by spec
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1011:25
+     │
+1011 │     lists:keytake(a, 1, non_tup),
+     │                         ^^^^^^^ 'non_tup'.
+Expression has type:   'non_tup'
+Context expected type: [Tuple]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1011:25
+     │
+1011 │     lists:keytake(a, 1, non_tup),
+     │                         ^^^^^^^ 'non_tup'.
+Expression has type:   'non_tup'
+Context expected type: [dynamic()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1016:25
+     │
+1016 │     lists:keytake(a, 1, non_list),
+     │                         ^^^^^^^^ 'non_list'.
+Expression has type:   'non_list'
+Context expected type: [Tuple]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1016:25
+     │
+1016 │     lists:keytake(a, 1, non_list),
+     │                         ^^^^^^^^ 'non_list'.
+Expression has type:   'non_list'
+Context expected type: [dynamic()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1021:22
+     │
+1021 │     lists:keytake(a, non_num, []),
+     │                      ^^^^^^^ 'non_num'.
+Expression has type:   'non_num'
+Context expected type: number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1038:15
+     │
+1038 │     lists:sum([a, 1]).
+     │               ^^^^^^
+     │               │
+     │               ['a', 1].
+Expression has type:   ['a' | number()]
+Context expected type: [number()]
+     │               
+
+Because in the expression's type:
+  [
+    Here the type is a union type with some valid candidates: number()
+    However the following candidate: 'a'
+    Differs from the expected type:  number()
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  ['a' | number()] is not compatible with [number()]
+  because
+  'a' | number() is not compatible with number()
+  because
+  'a' is not compatible with number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1042:15
+     │
+1042 │     lists:sum(not_a_list).
+     │               ^^^^^^^^^^ 'not_a_list'.
+Expression has type:   'not_a_list'
+Context expected type: [number()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1062:15
+     │
+1062 │     lists:max(not_a_list).
+     │               ^^^^^^^^^^ 'not_a_list'.
+Expression has type:   'not_a_list'
+Context expected type: [T]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1062:15
+     │
+1062 │     lists:max(not_a_list).
+     │               ^^^^^^^^^^ 'not_a_list'.
+Expression has type:   'not_a_list'
+Context expected type: [dynamic()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1082:15
+     │
+1082 │     lists:min(not_a_list).
+     │               ^^^^^^^^^^ 'not_a_list'.
+Expression has type:   'not_a_list'
+Context expected type: [T]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1082:15
+     │
+1082 │     lists:min(not_a_list).
+     │               ^^^^^^^^^^ 'not_a_list'.
+Expression has type:   'not_a_list'
+Context expected type: [dynamic()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1100:5
+     │
+1100 │     proplists:get_value(k, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value('k', L).
+Expression has type:   term()
+Context expected type: pid() | 'undefined'
+     │     
+
+  term() is not compatible with pid() | 'undefined'
+  because
+  term() is not compatible with pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1106:5
+     │
+1106 │     proplists:get_value(k, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value('k', L).
+Expression has type:   term()
+Context expected type: pid() | 'undefined' | 'v'
+     │     
+
+  term() is not compatible with pid() | 'undefined' | 'v'
+  because
+  term() is not compatible with pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1111:5
+     │
+1111 │     proplists:get_value(k, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^ proplists:get_value('k', L).
+Expression has type:   term()
+Context expected type: pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1117:5
+     │
+1117 │     proplists:get_value(k, L, 3).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value('k', L, 3).
+Expression has type:   term()
+Context expected type: pid() | number()
+     │     
+
+  term() is not compatible with pid() | number()
+  because
+  term() is not compatible with pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1123:5
+     │
+1123 │     proplists:get_value(k, L, my_default).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value('k', L, 'my_default').
+Expression has type:   term()
+Context expected type: 'v1' | 'v2' | 'my_default'
+     │     
+
+  term() is not compatible with 'v1' | 'v2' | 'my_default'
+  because
+  term() is not compatible with 'v1'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1129:5
+     │
+1129 │     proplists:get_value(k, L, my_default).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ proplists:get_value('k', L, 'my_default').
+Expression has type:   term()
+Context expected type: 'v'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1134:28
+     │
+1134 │     proplists:get_value(k, b).
+     │                            ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1139:5
+     │
+1139 │     proplists:get_value(k, []).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^ proplists:get_value('k', []).
+Expression has type:   term()
+Context expected type: 'default'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1144:1
+     │
+1144 │ proplists:get_value(k, [], my_default).
+     │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ proplists:get_value('k', [], 'my_default').
+Expression has type:   term()
+Context expected type: 'my_default'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1149:28
+     │
+1149 │     proplists:get_value(k, b, my_default).
+     │                            ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1154:5
+     │
+1154 │     proplists:get_bool(b, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^ proplists:get_bool('b', L).
+Expression has type:   boolean()
+Context expected type: 'true'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1160:5
+     │
+1160 │     proplists:get_all_values(k, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_all_values('k', L).
+Expression has type:   [term()]
+Context expected type: [pid() | 'default']
+     │     
+
+Because in the expression's type:
+  [
+    Here the type is:     term()
+    Context expects type: pid() | 'default'
+    No candidate matches in the expected union.
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [term()] is not compatible with [pid() | 'default']
+  because
+  term() is not compatible with pid() | 'default'
+  because
+  term() is not compatible with pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1166:5
+     │
+1166 │     proplists:get_all_values(k, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_all_values('k', L).
+Expression has type:   [term()]
+Context expected type: [pid() | 'default' | 'v']
+     │     
+
+Because in the expression's type:
+  [
+    Here the type is:     term()
+    Context expects type: pid() | 'default' | 'v'
+    No candidate matches in the expected union.
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [term()] is not compatible with [pid() | 'default' | 'v']
+  because
+  term() is not compatible with pid() | 'default' | 'v'
+  because
+  term() is not compatible with pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1171:5
+     │
+1171 │     proplists:get_all_values(k, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_all_values('k', L).
+Expression has type:   [term()]
+Context expected type: [pid()]
+     │     
+
+Because in the expression's type:
+  [
+    Here the type is:     term()
+    Context expects type: pid()
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [term()] is not compatible with [pid()]
+  because
+  term() is not compatible with pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1176:5
+     │
+1176 │     proplists:get_all_values(k, []).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_all_values('k', []).
+Expression has type:   [term()]
+Context expected type: []
+     │     
+
+Because in the expression's type:
+  [
+    Here the type is:     term()
+    Context expects type: none()
+  ]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1181:5
+     │
+1181 │     proplists:get_all_values(k, b).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_all_values('k', 'b').
+Expression has type:   [term()]
+Context expected type: []
+     │     
+
+Because in the expression's type:
+  [
+    Here the type is:     term()
+    Context expects type: none()
+  ]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1181:33
+     │
+1181 │     proplists:get_all_values(k, b).
+     │                                 ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1186:27
+     │
+1186 │     proplists:get_bool(b, b).
+     │                           ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1191:5
+     │
+1191 │     proplists:get_keys(L).
+     │     ^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_keys(L).
+Expression has type:   [term()]
+Context expected type: ['c']
+     │     
+
+Because in the expression's type:
+  [
+    Here the type is:     term()
+    Context expects type: 'c'
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [term()] is not compatible with ['c']
+  because
+  term() is not compatible with 'c'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1197:5
+     │
+1197 │     proplists:get_keys(L).
+     │     ^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_keys(L).
+Expression has type:   [term()]
+Context expected type: ['a' | 'b' | 'c']
+     │     
+
+Because in the expression's type:
+  [
+    Here the type is:     term()
+    Context expects type: 'a' | 'b' | 'c'
+    No candidate matches in the expected union.
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [term()] is not compatible with ['a' | 'b' | 'c']
+  because
+  term() is not compatible with 'a' | 'b' | 'c'
+  because
+  term() is not compatible with 'a'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1202:24
+     │
+1202 │     proplists:get_keys(a).
+     │                        ^ 'a'.
+Expression has type:   'a'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1207:5
+     │    
+1207 │ ╭ ╭     proplists:get_keys(
+1208 │ │ │         [{a, b, c}]
+1209 │ │ │     ).
+     │ ╰─│─────^ proplists:get_keys([{'a', 'b', 'c'}]).
+Expression has type:   [term()]
+Context expected type: ['a']
+     │   ╰─────' 
+
+Because in the expression's type:
+  [
+    Here the type is:     term()
+    Context expects type: 'a'
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [term()] is not compatible with ['a']
+  because
+  term() is not compatible with 'a'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1215:5
+     │
+1215 │     proplists:get_value(k, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value('k', L).
+Expression has type:   term()
+Context expected type: 'a' | pid()
+     │     
+
+  term() is not compatible with 'a' | pid()
+  because
+  term() is not compatible with 'a'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1220:5
+     │
+1220 │     proplists:get_value(k, b).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value('k', 'b').
+Expression has type:   term()
+Context expected type: 'a' | pid()
+     │     
+
+  term() is not compatible with 'a' | pid()
+  because
+  term() is not compatible with 'a'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1220:28
+     │
+1220 │     proplists:get_value(k, b).
+     │                            ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1225:1
+     │
+1225 │ proplists:lookup(self(), [a, {b, true}]).
+     │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │ │
+     │ proplists:lookup(erlang:self(), ['a', {'b', 'true'}]).
+Expression has type:   'none' | tuple()
+Context expected type: {'b', 'true'}
+     │ 
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: tuple()
+  However the following candidate: 'none'
+  Differs from the expected type:  {'b', 'true'}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1229:25
+     │
+1229 │     proplists:lookup(a, b).
+     │                         ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1239:5
+     │
+1239 │     proplists:lookup(k, []).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:lookup('k', []).
+Expression has type:   'none' | tuple()
+Context expected type: 'none'
+     │     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: 'none'
+  However the following candidate: tuple()
+  Differs from the expected type:  'none'
+
+------------------------------ Detailed message ------------------------------
+
+  'none' | tuple() is not compatible with 'none'
+  because
+  tuple() is not compatible with 'none'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1252:29
+     │
+1252 │     proplists:lookup_all(a, b).
+     │                             ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1265:5
+     │    
+1265 │ ╭ ╭     proplists:lookup_all(
+1266 │ │ │         self(),
+1267 │ │ │         []
+1268 │ │ │     ).
+     │ ╰─│─────^ proplists:lookup_all(erlang:self(), []).
+Expression has type:   [tuple()]
+Context expected type: []
+     │   ╰─────' 
+
+Because in the expression's type:
+  [
+    Here the type is:     tuple()
+    Context expects type: none()
+  ]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1291:34
+     │
+1291 │     proplists:is_defined(self(), b).
+     │                                  ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1295:25
+     │
+1295 │     proplists:delete(k, b).
+     │                         ^ 'b'.
+Expression has type:   'b'
+Context expected type: [A]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1295:25
+     │
+1295 │     proplists:delete(k, b).
+     │                         ^ 'b'.
+Expression has type:   'b'
+Context expected type: [dynamic()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1311:5
+     │
+1311 │     proplists:split(L, Ks).
+     │     ^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:split(L, Ks).
+Expression has type:   {[[term()]], [term()]}
+Context expected type: {[plist('a', 'b')], plist('a', 'b')}
+     │     
+
+Because in the expression's type:
+  { 
+    [
+      [
+        Here the type is:     term()
+        Context expects type: 'a' | {'a', 'b'}
+        No candidate matches in the expected union.
+      ]
+    ]
+  , [term()]}
+
+------------------------------ Detailed message ------------------------------
+
+  at tuple index 1:
+  {[[term()]], [term()]} is not compatible with {[plist('a', 'b')], plist('a', 'b')}
+  because
+  [[term()]] is not compatible with [plist('a', 'b')]
+  because
+  [term()] is not compatible with plist('a', 'b')
+  because
+  [term()] is not compatible with ['a' | {'a', 'b'}]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1315:21
+     │
+1315 │     proplists:split(b, []).
+     │                     ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1319:25
+     │
+1319 │     proplists:split([], b).
+     │                         ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1324:22
+     │
+1324 │     proplists:to_map(b).
+     │                      ^ 'b'.
+Expression has type:   'b'
+Context expected type: [atom() | {term(), term()} | term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1358:24
+     │
+1358 │     proplists:from_map(b).
+     │                        ^ 'b'.
+Expression has type:   'b'
+Context expected type: #{K => V}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1358:24
+     │
+1358 │     proplists:from_map(b).
+     │                        ^ 'b'.
+Expression has type:   'b'
+Context expected type: #{dynamic() => dynamic()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1363:5
+     │
+1363 │     proplists:get_value(a, [a]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value('a', ['a']).
+Expression has type:   term()
+Context expected type: 'true' | 'undefined'
+     │     
+
+  term() is not compatible with 'true' | 'undefined'
+  because
+  term() is not compatible with 'true'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1368:5
+     │
+1368 │     proplists:get_value(X, [a]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value(X, ['a']).
+Expression has type:   term()
+Context expected type: 'true' | 'undefined'
+     │     
+
+  term() is not compatible with 'true' | 'undefined'
+  because
+  term() is not compatible with 'true'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1373:5
+     │
+1373 │     proplists:get_value(a, [a], b).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value('a', ['a'], 'b').
+Expression has type:   term()
+Context expected type: 'true' | 'b'
+     │     
+
+  term() is not compatible with 'true' | 'b'
+  because
+  term() is not compatible with 'true'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1416:5
+     │
+1416 │     file:consult(some_file).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^ file:consult('some_file').
+Expression has type:   {'ok', [dynamic()]} | {'error', {number(), atom(), term()} | 'terminated' | 'badarg' | file:posix() | 'system_limit'}
+Context expected type: 'nok'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1428:5
+     │
+1428 │     lists:keysort(2, [{a, c}, {b, d}]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ lists:keysort(2, [{'a', 'c'}, {'b', 'd'}]).
+Expression has type:   [{'a', 'c'} | {'b', 'd'}]
+Context expected type: none()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1432:22
+     │
+1432 │     lists:keysort(1, [3]).
+     │                      ^^^
+     │                      │
+     │                      [3].
+Expression has type:   [number()]
+Context expected type: [tuple()]
+     │                      
+
+Because in the expression's type:
+  [
+    Here the type is:     number()
+    Context expects type: tuple()
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [number()] is not compatible with [tuple()]
+  because
+  number() is not compatible with tuple()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1448:5
+     │    
+1448 │ ╭ ╭     lists:filtermap(
+1449 │ │ │         fun(X) when X div 2 =:= 0 ->
+1450 │ │ │             {true, integer_to_list(X)};
+1451 │ │ │         (X) ->
+     · │ │
+1454 │ │ │         [1, 2, 3, 4]
+1455 │ │ │     ).
+     │ ╰─│─────^ lists:filtermap(fun, [1, 2, 3, 4]).
+Expression has type:   [string() | number()]
+Context expected type: [number()]
+     │   ╰─────' 
+
+Because in the expression's type:
+  [
+    Here the type is a union type with some valid candidates: number()
+    However the following candidate: string()
+    Differs from the expected type:  number()
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [string() | number()] is not compatible with [number()]
+  because
+  string() | number() is not compatible with number()
+  because
+  string() is not compatible with number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1482:5
+     │
+1482 │     erlang:min(X, Y).
+     │     ^^^^^^^^^^^^^^^^ erlang:min(X, Y).
+Expression has type:   number()
+Context expected type: none()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1497:5
+     │
+1497 │     erlang:max(X, Y).
+     │     ^^^^^^^^^^^^^^^^ erlang:max(X, Y).
+Expression has type:   atom() | number()
+Context expected type: none()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1523:9
+     │
+1523 │     abs(Atom).
+     │         ^^^^ Atom.
+Expression has type:   'a'
+Context expected type: number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1536:31
+     │
+1536 │ seq3_4_wip_neg() -> lists:seq(a, 2, 1).
+     │                               ^ 'a'.
+Expression has type:   'a'
+Context expected type: number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1539:30
+     │
+1539 │ seq3_5_neg() -> lists:seq(1, a, 1).
+     │                              ^ 'a'.
+Expression has type:   'a'
+Context expected type: number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1542:33
+     │
+1542 │ seq3_6_neg() -> lists:seq(1, 2, a).
+     │                                 ^ 'a'.
+Expression has type:   'a'
+Context expected type: number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1570:31
+     │
+1570 │ seq2_4_wip_neg() -> lists:seq(a, 2).
+     │                               ^ 'a'.
+Expression has type:   'a'
+Context expected type: number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1573:30
+     │
+1573 │ seq2_5_neg() -> lists:seq(1, a).
+     │                              ^ 'a'.
+Expression has type:   'a'
+Context expected type: number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1622:5
+     │  
+1622 │ ╭     timer:tc(
+1623 │ │         fun() ->
+1624 │ │             err
+1625 │ │         end
+1626 │ │     ).
+     │ ╰─────^ timer:tc(fun).
+Expression has type:   {number(), 'err'}
+Context expected type: pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1635:5
+     │
+1635 │     ets:lookup(tab, Any).
+     │     ^^^^^^^^^^^^^^^^^^^^ ets:lookup('tab', Any).
+Expression has type:   [dynamic()]
+Context expected type: pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1639:5
+     │
+1639 │     ets:lookup("not atom", Any).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ ets:lookup(string_lit, Any).
+Expression has type:   [dynamic()]
+Context expected type: pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1639:16
+     │
+1639 │     ets:lookup("not atom", Any).
+     │                ^^^^^^^^^^ string_lit.
+Expression has type:   string()
+Context expected type: ets:tab()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1663:18
+     │
+1663 │     ets:tab2list("not atom").
+     │                  ^^^^^^^^^^ string_lit.
+Expression has type:   string()
+Context expected type: ets:tab()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1702:23
+     │
+1702 │     lists:flatten([], 1).
+     │                       ^ 1.
+Expression has type:   number()
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1711:19
+     │
+1711 │     lists:flatten(3).
+     │                   ^ 3.
+Expression has type:   number()
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1724:8
+     │
+1724 │     -> lists:flatten(X).
+     │        ^^^^^^^^^^^^^^^^
+     │        │
+     │        lists:flatten(X).
+Expression has type:   [{A, B} | {B, A}]
+Context expected type: [{A, B}]
+     │        
+
+Because in the expression's type:
+  [
+    { 
+      Here the type is:     B
+      Context expects type: A
+    , A}
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [{A, B} | {B, A}] is not compatible with [{A, B}]
+  because
+  {A, B} | {B, A} is not compatible with {A, B}
+  because
+  at tuple index 1:
+  {B, A} is not compatible with {A, B}
+  because
+  B is not compatible with A
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1757:5
+     │    
+1757 │ ╭ ╭     maps:without(
+1758 │ │ │         [a, c, DOrE],
+1759 │ │ │         #{
+1760 │ │ │             a => ka,
+     · │ │
+1764 │ │ │         }
+1765 │ │ │     ).
+     │ ╰─│─────^ maps:without(['a', 'c', DOrE], #{..}).
+Expression has type:   #{a => 'ka', b => atom(), c => pid(), d => 'kd'}
+Context expected type: #{b => atom()}
+     │   ╰─────' 
+
+Because in the expression's type:
+  Here the type is:     #{a => ...}
+  Context expects type: #{...}
+  The expected map has no corresponding key for: a.
+
+------------------------------ Detailed message ------------------------------
+
+key `a` is declared in the former but not in the latter and the latter map has no default association
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1769:18
+     │
+1769 │     maps:without(non_list, #{}).
+     │                  ^^^^^^^^ 'non_list'.
+Expression has type:   'non_list'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1773:22
+     │
+1773 │     maps:without([], non_map).
+     │                      ^^^^^^^ 'non_map'.
+Expression has type:   'non_map'
+Context expected type: #{term() => term()}
+
+error: clause_not_covered (See https://fb.me/eqwalizer_errors#clause_not_covered)
+     ┌─ check/src/custom.erl:1808:1
+     │  
+1808 │ ╭ maps_without_12_neg(None) ->
+1809 │ │     maps:without(
+1810 │ │         [a, b],
+1811 │ │         None
+1812 │ │     ).
+     │ ╰─────^ Clause is not covered by spec
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1818:5
+     │    
+1818 │ ╭ ╭     maps:without(
+1819 │ │ │         Keys,
+1820 │ │ │         #{a => self(), b => self()}
+1821 │ │ │     ).
+     │ ╰─│─────^ maps:without(Keys, #{..}).
+Expression has type:   #{a => pid(), b => pid()}
+Context expected type: #{b := pid()}
+     │   ╰─────' 
+
+Because in the expression's type:
+  Here the type is:     #{b => ..., ...}
+  Context expects type: #{b := ..., ...}
+  The type of the expression is missing the following required keys: b.
+
+------------------------------ Detailed message ------------------------------
+
+key `b` is declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1826:5
+     │    
+1826 │ ╭ ╭     maps:without(
+1827 │ │ │         [a | improper_tail],
+1828 │ │ │         #{a => self(), b => self()}
+1829 │ │ │     ).
+     │ ╰─│─────^ maps:without(['a' | 'improper_tail'], #{..}).
+Expression has type:   #{a => pid(), b => pid()}
+Context expected type: #{b := pid()}
+     │   ╰─────' 
+
+Because in the expression's type:
+  Here the type is:     #{b => ..., ...}
+  Context expects type: #{b := ..., ...}
+  The type of the expression is missing the following required keys: b.
+
+------------------------------ Detailed message ------------------------------
+
+key `b` is declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1827:12
+     │
+1827 │         [a | improper_tail],
+     │            ^^^^^^^^^^^^^^^^ 'improper_tail'.
+Expression has type:   'improper_tail'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1837:5
+     │    
+1837 │ ╭ ╭     maps:without(
+1838 │ │ │         Keys,
+1839 │ │ │         #{a => ka, b => self()}
+1840 │ │ │     ).
+     │ ╰─│─────^ maps:without(Keys, #{..}).
+Expression has type:   #{a => 'ka', b => pid()}
+Context expected type: #{b := pid()}
+     │   ╰─────' 
+
+Because in the expression's type:
+  Here the type is:     #{b => ..., ...}
+  Context expects type: #{b := ..., ...}
+  The type of the expression is missing the following required keys: b.
+
+------------------------------ Detailed message ------------------------------
+
+key `b` is declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1854:5
+     │
+1854 │     maps:without([a, b], M).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     maps:without(['a', 'b'], M).
+Expression has type:   #{c := 'cv', d := 'dv'} | #{c := 'cv', e => 'ev'}
+Context expected type: #{c := atom()}
+     │     
+
+Because in the expression's type:
+  Here the type is:     #{d := ...}
+  Context expects type: #{...}
+  The expected map has no corresponding key for: d.
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1916:23
+     │
+1916 │     custom_overloaded(X).
+     │                       ^
+     │                       │
+     │                       X.
+Expression has type:   term()
+Context expected type: atom() | binary()
+     │                       
+
+  term() is not compatible with atom() | binary()
+  because
+  term() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1939:5
+     │
+1939 │     {A, N}.
+     │     ^^^^^^
+     │     │
+     │     {A, N}.
+Expression has type:   {atom(), number() | pid()}
+Context expected type: {atom(), number()}
+     │     
+
+Because in the expression's type:
+  { atom(), 
+    Here the type is a union type with some valid candidates: number()
+    However the following candidate: pid()
+    Differs from the expected type:  number()
+  }
+
+------------------------------ Detailed message ------------------------------
+
+  at tuple index 2:
+  {atom(), number() | pid()} is not compatible with {atom(), number()}
+  because
+  number() | pid() is not compatible with number()
+  because
+  pid() is not compatible with number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2041:5
+     │
+2041 │     filename:join(["server", "erl"]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     filename:join([string_lit, string_lit]).
+Expression has type:   file:filename_all()
+Context expected type: file:filename()
+     │     
+
+Because in the expression's type:
+  Here the type is:     string() | binary()
+  Context expects type: string()
+
+------------------------------ Detailed message ------------------------------
+
+  file:filename_all() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2046:5
+     │
+2046 │     filename:join(["server", <<>>]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     filename:join([string_lit, <<..>>]).
+Expression has type:   file:filename_all()
+Context expected type: file:filename()
+     │     
+
+Because in the expression's type:
+  Here the type is:     string() | binary()
+  Context expects type: string()
+
+------------------------------ Detailed message ------------------------------
+
+  file:filename_all() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2051:5
+     │
+2051 │     filename:join([<<>>, ""]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     filename:join([<<..>>, string_lit]).
+Expression has type:   file:filename_all()
+Context expected type: file:filename()
+     │     
+
+Because in the expression's type:
+  Here the type is:     string() | binary()
+  Context expects type: string()
+
+------------------------------ Detailed message ------------------------------
+
+  file:filename_all() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2066:5
+     │
+2066 │     filename:join([<<>>, <<>>]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     filename:join([<<..>>, <<..>>]).
+Expression has type:   file:filename_all()
+Context expected type: binary()
+     │     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: binary()
+  However the following candidate: string()
+  Differs from the expected type:  binary()
+
+------------------------------ Detailed message ------------------------------
+
+  file:filename_all() is not compatible with binary()
+  because
+  string() | binary() is not compatible with binary()
+  because
+  string() is not compatible with binary()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2081:19
+     │
+2081 │     filename:join([<<>>, self()]).
+     │                   ^^^^^^^^^^^^^^
+     │                   │
+     │                   [<<..>>, erlang:self()].
+Expression has type:   [binary() | pid()]
+Context expected type: [file:name_all()]
+     │                   
+
+Because in the expression's type:
+  [
+    Here the type is a union type with some valid candidates: binary()
+    However the following candidate: pid()
+    Differs from the expected type:  string() | atom() | file:deep_list() | binary()
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [binary() | pid()] is not compatible with [file:name_all()]
+  because
+  binary() | pid() is not compatible with file:name_all()
+  because
+  binary() | pid() is not compatible with string() | atom() | file:deep_list() | binary()
+  because
+  pid() is not compatible with string() | atom() | file:deep_list() | binary()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2086:5
+     │
+2086 │     filename:join("server", "erl").
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     filename:join(string_lit, string_lit).
+Expression has type:   file:filename_all()
+Context expected type: file:filename()
+     │     
+
+Because in the expression's type:
+  Here the type is:     string() | binary()
+  Context expects type: string()
+
+------------------------------ Detailed message ------------------------------
+
+  file:filename_all() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2091:5
+     │
+2091 │     filename:join("server", <<>>).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     filename:join(string_lit, <<..>>).
+Expression has type:   file:filename_all()
+Context expected type: file:filename()
+     │     
+
+Because in the expression's type:
+  Here the type is:     string() | binary()
+  Context expects type: string()
+
+------------------------------ Detailed message ------------------------------
+
+  file:filename_all() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2096:5
+     │
+2096 │     filename:join(<<>>, "").
+     │     ^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     filename:join(<<..>>, string_lit).
+Expression has type:   file:filename_all()
+Context expected type: file:filename()
+     │     
+
+Because in the expression's type:
+  Here the type is:     string() | binary()
+  Context expects type: string()
+
+------------------------------ Detailed message ------------------------------
+
+  file:filename_all() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2111:5
+     │
+2111 │     filename:join(atom, <<>>).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     filename:join('atom', <<..>>).
+Expression has type:   file:filename_all()
+Context expected type: binary()
+     │     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: binary()
+  However the following candidate: string()
+  Differs from the expected type:  binary()
+
+------------------------------ Detailed message ------------------------------
+
+  file:filename_all() is not compatible with binary()
+  because
+  string() | binary() is not compatible with binary()
+  because
+  string() is not compatible with binary()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2121:25
+     │
+2121 │     filename:join(<<>>, self()).
+     │                         ^^^^^^
+     │                         │
+     │                         erlang:self().
+Expression has type:   pid()
+Context expected type: file:name_all()
+     │                         
+
+Because in the expression's type:
+  Here the type is:     pid()
+  Context expects type: string() | atom() | file:deep_list() | binary()
+  No candidate matches in the expected union.
+
+------------------------------ Detailed message ------------------------------
+
+  pid() is not compatible with file:name_all()
+  because
+  pid() is not compatible with string() | atom() | file:deep_list() | binary()
+  because
+  pid() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2150:5
+     │    
+2150 │ ╭ ╭     queue:filter(
+2151 │ │ │         fun my_filter1/1,
+2152 │ │ │         Q
+2153 │ │ │     ).
+     │ ╰─│─────^ queue:filter(my_filter1/1, Q).
+Expression has type:   queue:queue(atom() | number())
+Context expected type: queue:queue(number())
+     │   ╰─────' 
+
+Because in the expression's type:
+  { 
+    [
+      Here the type is a union type with some valid candidates: number()
+      However the following candidate: atom()
+      Differs from the expected type:  number()
+    ]
+  , [atom() | number()]}
+
+------------------------------ Detailed message ------------------------------
+
+  queue:queue(atom() | number()) is not compatible with queue:queue(number())
+  because
+  {[atom() | number()], [atom() | number()]} is not compatible with queue:queue(number())
+  because
+  at tuple index 1:
+  {[atom() | number()], [atom() | number()]} is not compatible with {[number()], [number()]}
+  because
+  [atom() | number()] is not compatible with [number()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2191:5
+     │
+2191 │     M3.
+     │     ^^
+     │     │
+     │     M3.
+Expression has type:   #{count := number(), module := 'foo'} | #{module := 'foo'}
+Context expected type: state1()
+     │     
+
+Because in the expression's type:
+  The type is a union type with some valid candidates: #{count := number(), module := 'foo'}
+  However, the following candidate doesn't match:
+  Here the type is:     #{...}
+  Context expects type: #{count := ..., ...}
+  The type of the expression is missing the following required keys: count.
+
+------------------------------ Detailed message ------------------------------
+
+  #{count := number(), module := 'foo'} | #{module := 'foo'} is not compatible with state1()
+  because
+  #{count := number(), module := 'foo'} | #{module := 'foo'} is not compatible with #{count := number(), module := atom()}
+  because
+  #{module := 'foo'} is not compatible with #{count := number(), module := atom()}
+  key `count` is declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2223:13
+     │
+2223 │             Atom + Sum
+     │             ^^^^ Atom.
+Expression has type:   atom()
+Context expected type: number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2279:5
+     │
+2279 │     maps:remove(A, M).
+     │     ^^^^^^^^^^^^^^^^^
+     │     │
+     │     maps:remove(A, M).
+Expression has type:   #{a => number()}
+Context expected type: #{a := number()}
+     │     
+
+Because in the expression's type:
+  Here the type is:     #{a => ..., ...}
+  Context expects type: #{a := ..., ...}
+  The type of the expression is missing the following required keys: a.
+
+------------------------------ Detailed message ------------------------------
+
+key `a` is declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2320:5
+     │    
+2320 │ ╭ ╭     maps:filtermap(
+2321 │ │ │         fun
+2322 │ │ │             (a, V) -> true;
+2323 │ │ │             (b, V) -> {true, atom_to_binary(V)};
+     · │ │
+2326 │ │ │         M
+2327 │ │ │     ).
+     │ ╰─│─────^ maps:filtermap(fun, M).
+Expression has type:   #{a => atom() | binary(), b => atom() | binary(), c => atom() | binary()}
+Context expected type: #{a := atom(), b := binary()}
+     │   ╰─────' 
+
+Because in the expression's type:
+  Here the type is:     #{a => ..., b => ..., ...}
+  Context expects type: #{a := ..., b := ..., ...}
+  The type of the expression is missing the following required keys: a, b.
+
+------------------------------ Detailed message ------------------------------
+
+keys `a`, `b` are declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2342:5
+     │    
+2342 │ ╭ ╭     maps:filtermap(
+2343 │ │ │         fun (_, V) ->
+2344 │ │ │             {true, atom_to_binary(V)}
+2345 │ │ │         end,
+2346 │ │ │         M
+2347 │ │ │     ).
+     │ ╰─│─────^ maps:filtermap(fun, M).
+Expression has type:   #{atom() => binary()}
+Context expected type: #{atom() => atom()}
+     │   ╰─────' 
+
+Because in the expression's type:
+  #{ atom() =>
+    Here the type is:     binary()
+    Context expects type: atom()
+  , ... }
+
+------------------------------ Detailed message ------------------------------
+
+  #{atom() => binary()} is not compatible with #{atom() => atom()}
+  the default associations are not compatible
+  because
+  binary() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2354:23
+     │
+2354 │         fun (_, _) -> err end,
+     │                       ^^^
+     │                       │
+     │                       'err'.
+Expression has type:   'err'
+Context expected type: boolean() | {'true', term()}
+     │                       
+
+Because in the expression's type:
+  Here the type is:     'err'
+  Context expects type: 'false' | 'true' | {'true', term()}
+  No candidate matches in the expected union.
+
+------------------------------ Detailed message ------------------------------
+
+  'err' is not compatible with boolean() | {'true', term()}
+  because
+  'err' is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2362:5
+     │    
+2362 │ ╭ ╭     maps:filtermap(
+2363 │ │ │         fun (_, V) -> {true, atom_to_binary(V)} end,
+2364 │ │ │         M
+2365 │ │ │     ).
+     │ ╰─│─────^ maps:filtermap(fun, M).
+Expression has type:   #{atom() => binary()}
+Context expected type: #{atom() => atom()}
+     │   ╰─────' 
+
+Because in the expression's type:
+  #{ atom() =>
+    Here the type is:     binary()
+    Context expects type: atom()
+  , ... }
+
+------------------------------ Detailed message ------------------------------
+
+  #{atom() => binary()} is not compatible with #{atom() => atom()}
+  the default associations are not compatible
+  because
+  binary() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2363:45
+     │
+2363 │         fun (_, V) -> {true, atom_to_binary(V)} end,
+     │                                             ^ V.
+Expression has type:   binary()
+Context expected type: atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2377:5
+     │
+2377 │     re:replace(Subj, "+", "-", [{return, binary}]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ re:replace(Subj, string_lit, string_lit, [{'return', 'binary'}]).
+Expression has type:   binary()
+Context expected type: string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2381:5
+     │
+2381 │     re:replace(Subj, "+", "-", [{return, list}]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ re:replace(Subj, string_lit, string_lit, [{'return', 'list'}]).
+Expression has type:   string()
+Context expected type: binary()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2385:22
+     │
+2385 │     Res = re:replace(Subj, "+", "-", [{return, list}]),
+     │                      ^^^^
+     │                      │
+     │                      Subj.
+Expression has type:   atom()
+Context expected type: iodata() | unicode:charlist()
+     │                      
+
+Because in the expression's type:
+  Here the type is:     atom()
+  Context expects type: iolist() | binary()
+  No candidate matches in the expected union.
+
+------------------------------ Detailed message ------------------------------
+
+  atom() is not compatible with iodata() | unicode:charlist()
+  because
+  atom() is not compatible with iolist()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2386:5
+     │
+2386 │     Res.
+     │     ^^^ Res.
+Expression has type:   string()
+Context expected type: binary()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2390:38
+     │
+2390 │     Res = re:replace(Subj, "+", "-", [{return, something}]),
+     │                                      ^^^^^^^^^^^^^^^^^^^^^
+     │                                      │
+     │                                      [{'return', 'something'}].
+Expression has type:   [{'return', 'something'}]
+Context expected type: [{'newline', 'cr' | 'lf' | 'any' | 'crlf' | 'anycrlf'} | 'notempty_atstart' | 'noteol' | 'bsr_unicode' | 'notbol' | 'global' | {'match_limit_recursion', number()} | 'bsr_anycrlf' | re:compile_option() | {'match_limit', number()} | {'offset', number()} | 'notempty' | {'return', 'iodata' | 'list' | 'binary'} | 'anchored']
+     │                                      
+
+Because in the expression's type:
+  [
+    { 'return', 
+      Here the type is:     'something'
+      Context expects type: 'iodata' | 'list' | 'binary'
+      No candidate matches in the expected union.
+    }
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [{'return', 'something'}] is not compatible with [{'newline', 'cr' | 'lf' | 'any' | 'crlf' | 'anycrlf'} | 'notempty_atstart' | 'noteol' | 'bsr_unicode' | 'notbol' | 'global' | {'match_limit_recursion', number()} | 'bsr_anycrlf' | re:compile_option() | {'match_limit', number()} | {'offset', number()} | 'notempty' | {'return', 'iodata' | 'list' | 'binary'} | 'anchored']
+  because
+  {'return', 'something'} is not compatible with {'newline', 'cr' | 'lf' | 'any' | 'crlf' | 'anycrlf'} | 'notempty_atstart' | 'noteol' | 'bsr_unicode' | 'notbol' | 'global' | {'match_limit_recursion', number()} | 'bsr_anycrlf' | re:compile_option() | {'match_limit', number()} | {'offset', number()} | 'notempty' | {'return', 'iodata' | 'list' | 'binary'} | 'anchored'
+  because
+  at tuple index 2:
+  {'return', 'something'} is not compatible with {'return', 'iodata' | 'list' | 'binary'}
+  because
+  'something' is not compatible with 'iodata' | 'list' | 'binary'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2506:5
+     │
+2506 │     lists:partition(fun is_number/1, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     lists:partition(fun, L).
+Expression has type:   {[number()], [atom()]}
+Context expected type: {[atom()], [number()]}
+     │     
+
+Because in the expression's type:
+  { 
+    [
+      Here the type is:     number()
+      Context expects type: atom()
+    ]
+  , [atom()]}
+
+------------------------------ Detailed message ------------------------------
+
+  at tuple index 1:
+  {[number()], [atom()]} is not compatible with {[atom()], [number()]}
+  because
+  [number()] is not compatible with [atom()]
+  because
+  number() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2518:5
+     │
+2518 │     lists:partition(fun({_Term, V}) -> is_number(V) end, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     lists:partition(fun, L).
+Expression has type:   {[{term(), number()}], [{term(), atom()}]}
+Context expected type: {[{term(), atom()}], [{term(), number()}]}
+     │     
+
+Because in the expression's type:
+  { 
+    [
+      { term(), 
+        Here the type is:     number()
+        Context expects type: atom()
+      }
+    ]
+  , [{term(), atom()}]}
+
+------------------------------ Detailed message ------------------------------
+
+  at tuple index 1:
+  {[{term(), number()}], [{term(), atom()}]} is not compatible with {[{term(), atom()}], [{term(), number()}]}
+  because
+  [{term(), number()}] is not compatible with [{term(), atom()}]
+  because
+  at tuple index 2:
+  {term(), number()} is not compatible with {term(), atom()}
+  because
+  number() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2536:5
+     │
+2536 │     lists:partition(fun({ok, _}) -> true; (_) -> false end, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     lists:partition(fun, L).
+Expression has type:   {[{'ok', atom()}], [{'ok', atom()} | {'error', term()}]}
+Context expected type: {[{'ok', atom()}], [{'error', term()}]}
+     │     
+
+Because in the expression's type:
+  { [{'ok', atom()}], 
+    [
+      { 
+        Here the type is:     'ok'
+        Context expects type: 'error'
+      , atom()}
+    ]
+  }
+
+------------------------------ Detailed message ------------------------------
+
+  at tuple index 2:
+  {[{'ok', atom()}], [{'ok', atom()} | {'error', term()}]} is not compatible with {[{'ok', atom()}], [{'error', term()}]}
+  because
+  [{'ok', atom()} | {'error', term()}] is not compatible with [{'error', term()}]
+  because
+  {'ok', atom()} | {'error', term()} is not compatible with {'error', term()}
+  because
+  at tuple index 1:
+  {'ok', atom()} is not compatible with {'error', term()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2576:33
+     │
+2576 │ maps_intersect_2_neg(M1, M2) -> maps:intersect(M1, M2).
+     │                                 ^^^^^^^^^^^^^^^^^^^^^^
+     │                                 │
+     │                                 maps:intersect(M1, M2).
+Expression has type:   #{a => number()}
+Context expected type: #{a := number()}
+     │                                 
+
+Because in the expression's type:
+  Here the type is:     #{a => ..., ...}
+  Context expects type: #{a := ..., ...}
+  The type of the expression is missing the following required keys: a.
+
+------------------------------ Detailed message ------------------------------
+
+key `a` is declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2586:33
+     │
+2586 │ maps_intersect_4_neg(M1, M2) -> maps:intersect(M1, M2).
+     │                                 ^^^^^^^^^^^^^^^^^^^^^^
+     │                                 │
+     │                                 maps:intersect(M1, M2).
+Expression has type:   #{a => number()}
+Context expected type: #{a => 'true'}
+     │                                 
+
+Because in the expression's type:
+  #{ a =>
+    Here the type is:     number()
+    Context expects type: 'true'
+  , ... }
+
+------------------------------ Detailed message ------------------------------
+
+  #{a => number()} is not compatible with #{a => 'true'}
+  because
+  at key `a`:
+  #{a => number()} is not compatible with #{a => 'true'}
+  because
+  number() is not compatible with 'true'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2596:33
+     │
+2596 │ maps_intersect_6_neg(M1, M2) -> maps:intersect(M1, M2).
+     │                                 ^^^^^^^^^^^^^^^^^^^^^^
+     │                                 │
+     │                                 maps:intersect(M1, M2).
+Expression has type:   #{a => number()}
+Context expected type: #{a := number()}
+     │                                 
+
+Because in the expression's type:
+  Here the type is:     #{a => ..., ...}
+  Context expects type: #{a := ..., ...}
+  The type of the expression is missing the following required keys: a.
+
+------------------------------ Detailed message ------------------------------
+
+key `a` is declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2709:40
+     │
+2709 │             (foo, A) -> binary_to_atom(A);
+     │                                        ^ A.
+Expression has type:   atom()
+Context expected type: binary()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2710:40
+     │
+2710 │             (bar, B) -> atom_to_binary(B);
+     │                                        ^ B.
+Expression has type:   binary()
+Context expected type: atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2711:50
+     │
+2711 │             ({foo, bar}, I) -> binary_to_integer(I);
+     │                                                  ^ I.
+Expression has type:   number()
+Context expected type: binary()
+
+202 ERRORS
diff --git a/crates/elp/src/resources/test/eqwalizer_tests/check/custom.pretty b/crates/elp/src/resources/test/eqwalizer_tests/check/custom-OTP-27.pretty
similarity index 100%
rename from crates/elp/src/resources/test/eqwalizer_tests/check/custom.pretty
rename to crates/elp/src/resources/test/eqwalizer_tests/check/custom-OTP-27.pretty
diff --git a/crates/elp/src/resources/test/eqwalizer_tests/check/custom-OTP-28.pretty b/crates/elp/src/resources/test/eqwalizer_tests/check/custom-OTP-28.pretty
new file mode 100644
index 0000000000..ec107b3c14
--- /dev/null
+++ b/crates/elp/src/resources/test/eqwalizer_tests/check/custom-OTP-28.pretty
@@ -0,0 +1,3258 @@
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+   ┌─ check/src/custom.erl:26:5
+   │
+26 │     element(4, Tup).
+   │     ^^^^^^^^^^^^^^^ erlang:element(4, Tup).
+Expression has type:   #{dynamic() => dynamic()}
+Context expected type: atom()
+
+error: index_out_of_bounds (See https://fb.me/eqwalizer_errors#index_out_of_bounds)
+   ┌─ check/src/custom.erl:30:5
+   │
+30 │     element(42, Tup).
+   │     ^^^^^^^^^^^^^^^^ 42.
+Tried to access element 42 of a tuple with 3 elements
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+   ┌─ check/src/custom.erl:40:5
+   │
+40 │     element(2, Tup).
+   │     ^^^^^^^^^^^^^^^ erlang:element(2, Tup).
+Expression has type:   number() | string() | atom()
+Context expected type: #{dynamic() => dynamic()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+   ┌─ check/src/custom.erl:44:16
+   │
+44 │     element(2, Tup).
+   │                ^^^
+   │                │
+   │                Tup.
+Expression has type:   {atom(), string()} | [dynamic()]
+Context expected type: tuple()
+   │                
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: {atom(), string()}
+  However the following candidate: [dynamic()]
+  Differs from the expected type:  tuple()
+
+------------------------------ Detailed message ------------------------------
+
+  {atom(), string()} | [dynamic()] is not compatible with tuple()
+  because
+  [dynamic()] is not compatible with tuple()
+
+error: index_out_of_bounds (See https://fb.me/eqwalizer_errors#index_out_of_bounds)
+   ┌─ check/src/custom.erl:48:5
+   │
+48 │     element(42, Tup).
+   │     ^^^^^^^^^^^^^^^^ 42.
+Tried to access element 42 of a tuple with 2 elements
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+   ┌─ check/src/custom.erl:54:5
+   │
+54 │     element(N, Tup).
+   │     ^^^^^^^^^^^^^^^ erlang:element(N, Tup).
+Expression has type:   atom() | number() | string()
+Context expected type: #{dynamic() => dynamic()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+   ┌─ check/src/custom.erl:58:5
+   │
+58 │     element(N, Tup).
+   │     ^^^^^^^^^^^^^^^
+   │     │
+   │     erlang:element(N, Tup).
+Expression has type:   atom() | number()
+Context expected type: atom()
+   │     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: atom()
+  However the following candidate: number()
+  Differs from the expected type:  atom()
+
+------------------------------ Detailed message ------------------------------
+
+  atom() | number() is not compatible with atom()
+  because
+  number() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+   ┌─ check/src/custom.erl:68:5
+   │
+68 │     element(1, Tup).
+   │     ^^^^^^^^^^^^^^^
+   │     │
+   │     erlang:element(1, Tup).
+Expression has type:   dynamic() | number()
+Context expected type: atom()
+   │     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: dynamic()
+  However the following candidate: number()
+  Differs from the expected type:  atom()
+
+------------------------------ Detailed message ------------------------------
+
+  dynamic() | number() is not compatible with atom()
+  because
+  number() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+   ┌─ check/src/custom.erl:86:5
+   │
+86 │     element(N, Rec).
+   │     ^^^^^^^^^^^^^^^
+   │     │
+   │     erlang:element(N, Rec).
+Expression has type:   'foo' | 'ok' | 'error' | number() | string()
+Context expected type: atom()
+   │     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: 'error' | 'foo' | 'ok'
+  However the following candidate: string()
+  Differs from the expected type:  atom()
+
+------------------------------ Detailed message ------------------------------
+
+  'foo' | 'ok' | 'error' | number() | string() is not compatible with atom()
+  because
+  string() is not compatible with atom()
+
+error: clause_not_covered (See https://fb.me/eqwalizer_errors#clause_not_covered)
+   ┌─ check/src/custom.erl:91:1
+   │  
+91 │ ╭ element_2_none_1(Tup) ->
+92 │ │     element(42, Tup).
+   │ ╰────────────────────^ Clause is not covered by spec
+
+error: clause_not_covered (See https://fb.me/eqwalizer_errors#clause_not_covered)
+   ┌─ check/src/custom.erl:95:1
+   │  
+95 │ ╭ element_2_none_2(N, Tup) ->
+96 │ │     element(N, Tup).
+   │ ╰───────────────────^ Clause is not covered by spec
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:108:5
+    │
+108 │     maps:get(K, M).
+    │     ^^^^^^^^^^^^^^ maps:get(K, M).
+Expression has type:   number()
+Context expected type: atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:128:5
+    │
+128 │     Res.
+    │     ^^^ Res.
+Expression has type:   number()
+Context expected type: atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:154:12
+    │
+154 │     get(a, M).
+    │            ^ M.
+Expression has type:   term()
+Context expected type: #{term() => term()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:160:23
+    │
+160 │     Res = maps:get(a, M),
+    │                       ^ M.
+Expression has type:   term()
+Context expected type: #{term() => term()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:167:17
+    │
+167 │     maps:get(a, M, false).
+    │                 ^ M.
+Expression has type:   term()
+Context expected type: #{term() => term()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:173:23
+    │
+173 │     Res = maps:get(a, M, false),
+    │                       ^ M.
+Expression has type:   term()
+Context expected type: #{term() => term()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:193:5
+    │
+193 │     maps:get(K, M, 0).
+    │     ^^^^^^^^^^^^^^^^^
+    │     │
+    │     maps:get(K, M, 0).
+Expression has type:   number() | atom()
+Context expected type: atom()
+    │     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: atom()
+  However the following candidate: number()
+  Differs from the expected type:  atom()
+
+------------------------------ Detailed message ------------------------------
+
+  number() | atom() is not compatible with atom()
+  because
+  number() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:200:5
+    │
+200 │     Res.
+    │     ^^^
+    │     │
+    │     Res.
+Expression has type:   number() | atom()
+Context expected type: atom()
+    │     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: atom()
+  However the following candidate: number()
+  Differs from the expected type:  atom()
+
+------------------------------ Detailed message ------------------------------
+
+  number() | atom() is not compatible with atom()
+  because
+  number() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:206:5
+    │    
+206 │ ╭ ╭     {
+207 │ │ │         maps:get(a, M, undefined),
+208 │ │ │         maps:get(n, M, undefined)
+209 │ │ │     }.
+    │ ╰─│─────^ {maps:get('a', M, 'undefined'), maps:get('n', M, 'undefined')}.
+Expression has type:   {atom(), 'undefined' | number()}
+Context expected type: {atom(), number()}
+    │   ╰─────' 
+
+Because in the expression's type:
+  { atom(), 
+    Here the type is a union type with some valid candidates: number()
+    However the following candidate: 'undefined'
+    Differs from the expected type:  number()
+  }
+
+------------------------------ Detailed message ------------------------------
+
+  at tuple index 2:
+  {atom(), 'undefined' | number()} is not compatible with {atom(), number()}
+  because
+  'undefined' | number() is not compatible with number()
+  because
+  'undefined' is not compatible with number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:221:27
+    │
+221 │ map_get_2_17_neg(V, M) -> maps:get(V, M).
+    │                           ^^^^^^^^^^^^^^
+    │                           │
+    │                           maps:get(V, M).
+Expression has type:   'a_v' | 'c_v'
+Context expected type: 'a_v' | 'b_v'
+    │                           
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: 'a_v'
+  However the following candidate: 'c_v'
+  Differs from the expected type:  'a_v' | 'b_v'
+
+------------------------------ Detailed message ------------------------------
+
+  'a_v' | 'c_v' is not compatible with 'a_v' | 'b_v'
+  because
+  'c_v' is not compatible with 'a_v' | 'b_v'
+  because
+  'c_v' is not compatible with 'a_v'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:233:27
+    │
+233 │ map_get_3_19_neg(V, M) -> maps:get(V, M, undefined).
+    │                           ^^^^^^^^^^^^^^^^^^^^^^^^^
+    │                           │
+    │                           maps:get(V, M, 'undefined').
+Expression has type:   'undefined' | 'a_v' | 'c_v'
+Context expected type: 'a_v' | 'b_v' | 'undefined'
+    │                           
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: 'undefined' | 'a_v'
+  However the following candidate: 'c_v'
+  Differs from the expected type:  'a_v' | 'b_v' | 'undefined'
+
+------------------------------ Detailed message ------------------------------
+
+  'undefined' | 'a_v' | 'c_v' is not compatible with 'a_v' | 'b_v' | 'undefined'
+  because
+  'c_v' is not compatible with 'a_v' | 'b_v' | 'undefined'
+  because
+  'c_v' is not compatible with 'a_v'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:309:5
+    │
+309 │     Res.
+    │     ^^^ Res.
+Expression has type:   {'value', #{}} | 'false'
+Context expected type: 'nok'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:363:23
+    │
+363 │         fun (_, _) -> self() end,
+    │                       ^^^^^^ erlang:self().
+Expression has type:   pid()
+Context expected type: boolean()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:382:17
+    │
+382 │     maps:filter(F, M).
+    │                 ^ F.
+Expression has type:   fun(() -> pid())
+Context expected type: fun((number(), 'a' | 'b') -> boolean())
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:389:17
+    │
+389 │     maps:filter(F, M).
+    │                 ^
+    │                 │
+    │                 F.
+Expression has type:   fun((fun((T) -> boolean()), [T]) -> [T]) with 1 type parameter
+Context expected type: fun((number(), 'a' | 'b') -> boolean()) with 0 type parameters
+    │                 
+
+Because in the expression's type:
+  Here the type is:     fun()/2 with 1 type parameter
+  Context expects type: fun((number(), 'a' | 'b') -> boolean()) with 0 type parameters
+  The number of type parameters doesn't match.
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:413:37
+    │
+413 │     maps:filter(fun erlang:'=:='/2, X).
+    │                                     ^
+    │                                     │
+    │                                     X.
+Expression has type:   #{K => V} | 'a'
+Context expected type: #{term() => term()} | maps:iterator()
+    │                                     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: #{K => V}
+  However the following candidate: 'a'
+  Differs from the expected type:  #{term() => term()} | maps:iterator()
+
+------------------------------ Detailed message ------------------------------
+
+  #{K => V} | 'a' is not compatible with #{term() => term()} | maps:iterator()
+  because
+  'a' is not compatible with #{term() => term()} | maps:iterator()
+  because
+  'a' is not compatible with #{term() => term()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:425:20
+    │
+425 │     maps:filter(F, non_kv),
+    │                    ^^^^^^
+    │                    │
+    │                    'non_kv'.
+Expression has type:   'non_kv'
+Context expected type: #{term() => term()} | maps:iterator()
+    │                    
+
+  'non_kv' is not compatible with #{term() => term()} | maps:iterator()
+  because
+  'non_kv' is not compatible with #{term() => term()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:454:5
+    │    
+454 │ ╭ ╭     maps:map(
+455 │ │ │         fun (_, _) -> self() end,
+456 │ │ │         M
+457 │ │ │     ).
+    │ ╰─│─────^ maps:map(fun, M).
+Expression has type:   #{number() => pid()}
+Context expected type: #{number() => boolean()}
+    │   ╰─────' 
+
+Because in the expression's type:
+  #{ number() =>
+    Here the type is:     pid()
+    Context expects type: boolean()
+  , ... }
+
+------------------------------ Detailed message ------------------------------
+
+  #{number() => pid()} is not compatible with #{number() => boolean()}
+  the default associations are not compatible
+  because
+  pid() is not compatible with boolean()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:474:14
+    │
+474 │     maps:map(F, M).
+    │              ^ F.
+Expression has type:   fun(() -> pid())
+Context expected type: fun((number(), 'a' | 'b') -> term())
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:481:14
+    │
+481 │     maps:map(F, M).
+    │              ^
+    │              │
+    │              F.
+Expression has type:   fun((fun((A) -> B), [A]) -> [B]) with 2 type parameters
+Context expected type: fun((number(), 'a' | 'b') -> term()) with 0 type parameters
+    │              
+
+Because in the expression's type:
+  Here the type is:     fun((fun((A) -> B), [A]) -> [B]) with 2 type parameters
+  Context expects type: fun((number(), 'a' | 'b') -> term()) with 0 type parameters
+  The number of type parameters doesn't match.
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:497:5
+    │
+497 │     maps:map(F, M).
+    │     ^^^^^^^^^^^^^^
+    │     │
+    │     maps:map(F, M).
+Expression has type:   #{a := boolean(), b := boolean()}
+Context expected type: #{a => 'a', b => 'b'}
+    │     
+
+Because in the expression's type:
+  #{ a =>
+    Here the type is:     boolean()
+    Context expects type: 'a'
+  , ... }
+
+------------------------------ Detailed message ------------------------------
+
+  #{a := boolean(), b := boolean()} is not compatible with #{a => 'a', b => 'b'}
+  because
+  at key `a`:
+  #{a := boolean(), b := boolean()} is not compatible with #{a => 'a', b => 'b'}
+  because
+  boolean() is not compatible with 'a'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:503:17
+    │
+503 │     maps:map(F, non_kv),
+    │                 ^^^^^^
+    │                 │
+    │                 'non_kv'.
+Expression has type:   'non_kv'
+Context expected type: #{term() => term()} | maps:iterator()
+    │                 
+
+  'non_kv' is not compatible with #{term() => term()} | maps:iterator()
+  because
+  'non_kv' is not compatible with #{term() => term()}
+
+error: fun_arity_mismatch (See https://fb.me/eqwalizer_errors#fun_arity_mismatch)
+    ┌─ check/src/custom.erl:538:9
+    │
+538 │         fun (K, V) -> [K, V] end, [], M).
+    │         ^^^^^^^^^^^^^^^^^^^^^^^^ fun.
+fun with arity 2 used as fun with 3 arguments
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:544:5
+    │    
+544 │ ╭ ╭     maps:fold(
+545 │ │ │         fun (_, _, Acc) -> [Acc] end,
+546 │ │ │         [],
+547 │ │ │         M
+548 │ │ │     ).
+    │ ╰─│─────^ maps:fold(fun, [], M).
+Expression has type:   [[[]]]
+Context expected type: [number() | 'a' | 'b']
+    │   ╰─────' 
+
+Because in the expression's type:
+  [
+    Here the type is:     [[]]
+    Context expects type: number() | 'a' | 'b'
+    No candidate matches in the expected union.
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [[[]]] is not compatible with [number() | 'a' | 'b']
+  because
+  [[]] is not compatible with number() | 'a' | 'b'
+  because
+  [[]] is not compatible with number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:545:28
+    │
+545 │         fun (_, _, Acc) -> [Acc] end,
+    │                            ^^^^^
+    │                            │
+    │                            [Acc].
+Expression has type:   [[[[]]]]
+Context expected type: [[[]]]
+    │                            
+
+Because in the expression's type:
+  [
+    [
+      [
+        Here the type is:     []
+        Context expects type: none()
+      ]
+    ]
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [[[[]]]] is not compatible with [[[]]]
+  because
+  [[[]]] is not compatible with [[]]
+  because
+  [[]] is not compatible with []
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:552:5
+    │  
+552 │ ╭     maps:fold(
+553 │ │         fun (_, _, Acc) -> Acc end,
+554 │ │         [],
+555 │ │         non_kv
+556 │ │     ).
+    │ ╰─────^ maps:fold(fun, [], 'non_kv').
+Expression has type:   []
+Context expected type: 'nok'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:555:9
+    │
+555 │         non_kv
+    │         ^^^^^^
+    │         │
+    │         'non_kv'.
+Expression has type:   'non_kv'
+Context expected type: #{term() => term()} | maps:iterator()
+    │         
+
+  'non_kv' is not compatible with #{term() => term()} | maps:iterator()
+  because
+  'non_kv' is not compatible with #{term() => term()}
+
+error: clause_not_covered (See https://fb.me/eqwalizer_errors#clause_not_covered)
+    ┌─ check/src/custom.erl:560:1
+    │  
+560 │ ╭ maps_fold_3_6(None) ->
+561 │ │     maps:fold(
+562 │ │         None,
+563 │ │         #{},
+564 │ │         #{1 => 1}
+565 │ │     ).
+    │ ╰─────^ Clause is not covered by spec
+
+error: clause_not_covered (See https://fb.me/eqwalizer_errors#clause_not_covered)
+    ┌─ check/src/custom.erl:568:1
+    │  
+568 │ ╭ maps_fold_3_7(None) ->
+569 │ │     maps:fold(
+570 │ │         None,
+571 │ │         None,
+572 │ │         None
+573 │ │     ).
+    │ ╰─────^ Clause is not covered by spec
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:578:5
+    │    
+578 │ ╭ ╭     maps:fold(
+579 │ │ │         fun (_K, A, _Acc) -> A end,
+580 │ │ │         [],
+581 │ │ │         M
+582 │ │ │     ).
+    │ ╰─│─────^ maps:fold(fun, [], M).
+Expression has type:   [] | atom()
+Context expected type: atom()
+    │   ╰─────' 
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: atom()
+  However the following candidate: []
+  Differs from the expected type:  atom()
+
+------------------------------ Detailed message ------------------------------
+
+  [] | atom() is not compatible with atom()
+  because
+  [] is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:601:9
+    │
+601 │         fun folder_bad/3,
+    │         ^^^^^^^^^^^^^^^^
+    │         │
+    │         folder_bad/3.
+Expression has type:   fun((term(), term(), Acc) -> [Acc]) with 1 type parameter
+Context expected type: fun((number(), 'a', []) -> term()) with 0 type parameters
+    │         
+
+Because in the expression's type:
+  Here the type is:     fun((term(), term(), Acc) -> [Acc]) with 1 type parameter
+  Context expects type: fun((number(), 'a', []) -> term()) with 0 type parameters
+  The number of type parameters doesn't match.
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:601:9
+    │
+601 │         fun folder_bad/3,
+    │         ^^^^^^^^^^^^^^^^
+    │         │
+    │         folder_bad/3.
+Expression has type:   fun((term(), term(), Acc) -> [Acc]) with 1 type parameter
+Context expected type: fun((number(), 'a', [] | dynamic()) -> term()) with 0 type parameters
+    │         
+
+Because in the expression's type:
+  Here the type is:     fun((term(), term(), Acc) -> [Acc]) with 1 type parameter
+  Context expects type: fun()/3 with 0 type parameters
+  The number of type parameters doesn't match.
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:601:9
+    │
+601 │         fun folder_bad/3,
+    │         ^^^^^^^^^^^^^^^^
+    │         │
+    │         folder_bad/3.
+Expression has type:   fun((term(), term(), Acc) -> [Acc]) with 1 type parameter
+Context expected type: fun((number(), 'a', [] | dynamic()) -> [] | dynamic()) with 0 type parameters
+    │         
+
+Because in the expression's type:
+  Here the type is:     fun((term(), term(), Acc) -> [Acc]) with 1 type parameter
+  Context expects type: fun()/3 with 0 type parameters
+  The number of type parameters doesn't match.
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:636:5
+    │    
+636 │ ╭ ╭     maps:fold(
+637 │ │ │         fun
+638 │ │ │             (_K, {i, I}, Acc) ->
+639 │ │ │                 [I | Acc];
+    · │ │
+646 │ │ │         M
+647 │ │ │     ).
+    │ ╰─│─────^ maps:fold(fun, [], M).
+Expression has type:   [number() | binary() | atom()]
+Context expected type: [binary()] | [number()] | [atom()]
+    │   ╰─────' 
+
+Because in the expression's type:
+  [
+    Here the type is a union type with some valid candidates: binary()
+    However the following candidate: number()
+    Differs from the expected type:  binary()
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [number() | binary() | atom()] is not compatible with [binary()] | [number()] | [atom()]
+  because
+  [number() | binary() | atom()] is not compatible with [binary()]
+  because
+  number() | binary() | atom() is not compatible with binary()
+  because
+  number() is not compatible with binary()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:671:41
+    │
+671 │ maps_to_list_7_neg(Num) -> maps:to_list(Num).
+    │                                         ^^^
+    │                                         │
+    │                                         Num.
+Expression has type:   number()
+Context expected type: #{term() => term()} | maps:iterator()
+    │                                         
+
+  number() is not compatible with #{term() => term()} | maps:iterator()
+  because
+  number() is not compatible with #{term() => term()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:675:25
+    │
+675 │ maps_merge_1(M1, M2) -> maps:merge(M1, M2).
+    │                         ^^^^^^^^^^^^^^^^^^
+    │                         │
+    │                         maps:merge(M1, M2).
+Expression has type:   #{'b' | 'a' | 'c' => number() | string() | atom()}
+Context expected type: #{a => string(), b => number(), c => atom()}
+    │                         
+
+Because in the expression's type:
+  Here the type is:     #{'b' | 'a' | 'c' => number() | string() | atom()}
+  Context expects type: #{...} (no default association)
+  The expected map has no default association while the type of the expression has one.
+
+------------------------------ Detailed message ------------------------------
+
+  #{'b' | 'a' | 'c' => number() | string() | atom()} is not compatible with #{a => string(), b => number(), c => atom()}
+  key a is not present in the former map but is incompatible with its default association
+  because
+  number() | string() | atom() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:679:25
+    │
+679 │ maps_merge_2(M1, M2) -> maps:merge(M1, M2).
+    │                         ^^^^^^^^^^^^^^^^^^
+    │                         │
+    │                         maps:merge(M1, M2).
+Expression has type:   #{'b' | 'a' | 'c' => number() | string() | atom()}
+Context expected type: #{a => string(), b => number() | boolean(), c => atom()}
+    │                         
+
+Because in the expression's type:
+  Here the type is:     #{'b' | 'a' | 'c' => number() | string() | atom()}
+  Context expects type: #{...} (no default association)
+  The expected map has no default association while the type of the expression has one.
+
+------------------------------ Detailed message ------------------------------
+
+  #{'b' | 'a' | 'c' => number() | string() | atom()} is not compatible with #{a => string(), b => number() | boolean(), c => atom()}
+  key a is not present in the former map but is incompatible with its default association
+  because
+  number() | string() | atom() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:683:25
+    │
+683 │ maps_merge_3(M1, M2) -> maps:merge(M1, M2).
+    │                         ^^^^^^^^^^^^^^^^^^
+    │                         │
+    │                         maps:merge(M1, M2).
+Expression has type:   #{'b' | 'a' | 'c' => number() | string() | atom()}
+Context expected type: #{a := string(), b := boolean(), c => atom()}
+    │                         
+
+Because in the expression's type:
+  Here the type is:     #{...}
+  Context expects type: #{a := ..., b := ..., ...}
+  The type of the expression is missing the following required keys: a, b.
+
+------------------------------ Detailed message ------------------------------
+
+keys `a`, `b` are declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:697:44
+    │
+697 │ maps_merge_7_neg(M1, M2) -> maps:merge(M1, M2).
+    │                                            ^^ M2.
+Expression has type:   number()
+Context expected type: #{a => binary()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:701:25
+    │
+701 │ maps_merge_8(M1, M2) -> maps:merge(M1, M2).
+    │                         ^^^^^^^^^^^^^^^^^^
+    │                         │
+    │                         maps:merge(M1, M2).
+Expression has type:   #{'a' | 'b' => atom() | number()}
+Context expected type: #{a := atom(), b := number()} | #{a := atom()}
+    │                         
+
+Because in the expression's type:
+  Here the type is:     #{...}
+  Context expects type: #{a := ..., b := ..., ...}
+  The type of the expression is missing the following required keys: a, b.
+
+------------------------------ Detailed message ------------------------------
+
+  #{'a' | 'b' => atom() | number()} is not compatible with #{a := atom(), b := number()} | #{a := atom()}
+  because
+  #{'a' | 'b' => atom() | number()} is not compatible with #{a := atom(), b := number()}
+  keys `a`, `b` are declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:721:9
+    │
+721 │         fun erlang:binary_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:binary_to_list/1.
+Expression has type:   fun((binary()) -> [number()])
+Context expected type: fun((number()) -> boolean() | {'true', term()})
+    │         
+
+Because in the expression's type:
+  fun((binary()) ->
+    Here the type is:     [number()]
+    Context expects type: 'false' | 'true' | {'true', term()}
+    No candidate matches in the expected union.
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((binary()) -> [number()]) is not compatible with fun((number()) -> boolean() | {'true', term()})
+  because
+  [number()] is not compatible with boolean() | {'true', term()}
+  because
+  [number()] is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:739:20
+    │
+739 │             (3) -> wrong_ret end,
+    │                    ^^^^^^^^^
+    │                    │
+    │                    'wrong_ret'.
+Expression has type:   'wrong_ret'
+Context expected type: boolean() | {'true', term()}
+    │                    
+
+Because in the expression's type:
+  Here the type is:     'wrong_ret'
+  Context expects type: 'false' | 'true' | {'true', term()}
+  No candidate matches in the expected union.
+
+------------------------------ Detailed message ------------------------------
+
+  'wrong_ret' is not compatible with boolean() | {'true', term()}
+  because
+  'wrong_ret' is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:749:9
+    │
+749 │         not_a_list
+    │         ^^^^^^^^^^ 'not_a_list'.
+Expression has type:   'not_a_list'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:791:17
+    │
+791 │                 Res
+    │                 ^^^
+    │                 │
+    │                 Res.
+Expression has type:   {'true', 'a'} | 'wrong_ret'
+Context expected type: boolean() | {'true', term()}
+    │                 
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: {'true', 'a'}
+  However the following candidate: 'wrong_ret'
+  Differs from the expected type:  'false' | 'true' | {'true', term()}
+
+------------------------------ Detailed message ------------------------------
+
+  {'true', 'a'} | 'wrong_ret' is not compatible with boolean() | {'true', term()}
+  because
+  'wrong_ret' is not compatible with boolean() | {'true', term()}
+  because
+  'wrong_ret' is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:827:9
+    │    
+827 │ ╭ ╭         fun (a) -> [a];
+828 │ │ │             (b) -> true;
+829 │ │ │             (c) -> wrong_ret end,
+    │ ╰─│────────────────────────────────^ fun.
+Expression has type:   fun(('a' | 'b') -> ['a'] | 'true' | 'wrong_ret')
+Context expected type: fun(('a' | 'b') -> boolean() | ['a' | 'b'])
+    │   ╰────────────────────────────────' 
+
+Because in the expression's type:
+  fun(('a' | 'b') ->
+    Here the type is a union type with some valid candidates: ['a'] | 'true'
+    However the following candidate: 'wrong_ret'
+    Differs from the expected type:  'false' | 'true' | ['a' | 'b']
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun(('a' | 'b') -> ['a'] | 'true' | 'wrong_ret') is not compatible with fun(('a' | 'b') -> boolean() | ['a' | 'b'])
+  because
+  ['a'] | 'true' | 'wrong_ret' is not compatible with boolean() | ['a' | 'b']
+  because
+  'wrong_ret' is not compatible with boolean() | ['a' | 'b']
+  because
+  'wrong_ret' is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:829:20
+    │
+829 │             (c) -> wrong_ret end,
+    │                    ^^^^^^^^^
+    │                    │
+    │                    'wrong_ret'.
+Expression has type:   'wrong_ret'
+Context expected type: boolean() | ['a' | 'b']
+    │                    
+
+Because in the expression's type:
+  Here the type is:     'wrong_ret'
+  Context expects type: 'false' | 'true' | ['a' | 'b']
+  No candidate matches in the expected union.
+
+------------------------------ Detailed message ------------------------------
+
+  'wrong_ret' is not compatible with boolean() | ['a' | 'b']
+  because
+  'wrong_ret' is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:837:9
+    │    
+837 │ ╭ ╭         fun (1) -> {true, a};
+838 │ │ │             (2) -> true end,
+    │ ╰─│───────────────────────────^ fun.
+Expression has type:   fun((dynamic()) -> {'true', 'a'} | 'true')
+Context expected type: fun((Item) -> boolean() | [Item])
+    │   ╰───────────────────────────' 
+
+Because in the expression's type:
+  fun((dynamic()) ->
+    Here the type is a union type with some valid candidates: 'true'
+    However the following candidate: {'true', 'a'}
+    Differs from the expected type:  'false' | 'true' | [Item]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((dynamic()) -> {'true', 'a'} | 'true') is not compatible with fun((Item) -> boolean() | [Item])
+  because
+  {'true', 'a'} | 'true' is not compatible with boolean() | [Item]
+  because
+  {'true', 'a'} is not compatible with boolean() | [Item]
+  expected union does not contain any tuple type of size 2
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:837:20
+    │
+837 │         fun (1) -> {true, a};
+    │                    ^^^^^^^^^
+    │                    │
+    │                    {'true', 'a'}.
+Expression has type:   {'true', 'a'}
+Context expected type: boolean() | [dynamic()]
+    │                    
+
+Because in the expression's type:
+  Here the type is:     {'true', 'a'}
+  Context expects type: 'false' | 'true' | [dynamic()]
+  No candidate matches in the expected union.
+
+------------------------------ Detailed message ------------------------------
+
+expected union does not contain any tuple type of size 2
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:839:9
+    │
+839 │         not_a_queue
+    │         ^^^^^^^^^^^
+    │         │
+    │         'not_a_queue'.
+Expression has type:   'not_a_queue'
+Context expected type: queue:queue(Item)
+    │         
+
+Because in the expression's type:
+  Here the type is:     'not_a_queue'
+  Context expects type: {[Item], [Item]}
+
+------------------------------ Detailed message ------------------------------
+
+  'not_a_queue' is not compatible with queue:queue(Item)
+  because
+  'not_a_queue' is not compatible with {[Item], [Item]}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:839:9
+    │
+839 │         not_a_queue
+    │         ^^^^^^^^^^^
+    │         │
+    │         'not_a_queue'.
+Expression has type:   'not_a_queue'
+Context expected type: queue:queue(dynamic())
+    │         
+
+Because in the expression's type:
+  Here the type is:     'not_a_queue'
+  Context expects type: {[dynamic()], [dynamic()]}
+
+------------------------------ Detailed message ------------------------------
+
+  'not_a_queue' is not compatible with queue:queue(dynamic())
+  because
+  'not_a_queue' is not compatible with {[dynamic()], [dynamic()]}
+
+error: fun_arity_mismatch (See https://fb.me/eqwalizer_errors#fun_arity_mismatch)
+    ┌─ check/src/custom.erl:846:9
+    │  
+846 │ ╭         fun (wrong, arity) ->
+847 │ │             [a]
+848 │ │         end,
+    │ ╰───────────^ fun.
+fun with arity 2 used as fun with 1 arguments
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:857:9
+    │    
+857 │ ╭ ╭         fun (1) -> {true, a};
+858 │ │ │             (X) -> case X of
+859 │ │ │                        true ->
+860 │ │ │                            [a];
+    · │ │
+863 │ │ │                    end
+864 │ │ │         end,
+    │ ╰─│───────────^ fun.
+Expression has type:   fun(('a' | 'b') -> ['a'] | 'false' | {'true', 'a'})
+Context expected type: fun(('a' | 'b') -> boolean() | ['a' | 'b'])
+    │   ╰───────────' 
+
+Because in the expression's type:
+  fun(('a' | 'b') ->
+    Here the type is a union type with some valid candidates: ['a'] | 'false'
+    However the following candidate: {'true', 'a'}
+    Differs from the expected type:  'false' | 'true' | ['a' | 'b']
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun(('a' | 'b') -> ['a'] | 'false' | {'true', 'a'}) is not compatible with fun(('a' | 'b') -> boolean() | ['a' | 'b'])
+  because
+  ['a'] | 'false' | {'true', 'a'} is not compatible with boolean() | ['a' | 'b']
+  because
+  {'true', 'a'} is not compatible with boolean() | ['a' | 'b']
+  expected union does not contain any tuple type of size 2
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:857:20
+    │
+857 │         fun (1) -> {true, a};
+    │                    ^^^^^^^^^
+    │                    │
+    │                    {'true', 'a'}.
+Expression has type:   {'true', 'a'}
+Context expected type: boolean() | ['a' | 'b']
+    │                    
+
+Because in the expression's type:
+  Here the type is:     {'true', 'a'}
+  Context expects type: 'false' | 'true' | ['a' | 'b']
+  No candidate matches in the expected union.
+
+------------------------------ Detailed message ------------------------------
+
+expected union does not contain any tuple type of size 2
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:873:9
+    │    
+873 │ ╭ ╭         fun (a) -> [a];
+874 │ │ │             (X) ->
+875 │ │ │                 Res = case X of
+876 │ │ │                           true ->
+    · │ │
+881 │ │ │                 Res
+882 │ │ │         end,
+    │ ╰─│───────────^ fun.
+Expression has type:   fun(('a' | 'b') -> ['a'] | 'wrong_ret')
+Context expected type: fun(('a' | 'b') -> boolean() | ['a' | 'b'])
+    │   ╰───────────' 
+
+Because in the expression's type:
+  fun(('a' | 'b') ->
+    Here the type is a union type with some valid candidates: ['a']
+    However the following candidate: 'wrong_ret'
+    Differs from the expected type:  'false' | 'true' | ['a' | 'b']
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun(('a' | 'b') -> ['a'] | 'wrong_ret') is not compatible with fun(('a' | 'b') -> boolean() | ['a' | 'b'])
+  because
+  ['a'] | 'wrong_ret' is not compatible with boolean() | ['a' | 'b']
+  because
+  'wrong_ret' is not compatible with boolean() | ['a' | 'b']
+  because
+  'wrong_ret' is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:881:17
+    │
+881 │                 Res
+    │                 ^^^
+    │                 │
+    │                 Res.
+Expression has type:   ['a'] | 'wrong_ret'
+Context expected type: boolean() | ['a' | 'b']
+    │                 
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: ['a']
+  However the following candidate: 'wrong_ret'
+  Differs from the expected type:  'false' | 'true' | ['a' | 'b']
+
+------------------------------ Detailed message ------------------------------
+
+  ['a'] | 'wrong_ret' is not compatible with boolean() | ['a' | 'b']
+  because
+  'wrong_ret' is not compatible with boolean() | ['a' | 'b']
+  because
+  'wrong_ret' is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:891:9
+    │
+891 │         fun list_to_atom/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:list_to_atom/1.
+Expression has type:   fun((string()) -> atom())
+Context expected type: fun((dynamic()) -> boolean() | [dynamic()])
+    │         
+
+Because in the expression's type:
+  fun((string()) ->
+    Here the type is:     atom()
+    Context expects type: 'false' | 'true' | [dynamic()]
+    No candidate matches in the expected union.
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((string()) -> atom()) is not compatible with fun((dynamic()) -> boolean() | [dynamic()])
+  because
+  atom() is not compatible with boolean() | [dynamic()]
+  because
+  atom() is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:891:9
+    │
+891 │         fun list_to_atom/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:list_to_atom/1.
+Expression has type:   fun((string()) -> atom())
+Context expected type: fun(('a' | 'b') -> boolean() | ['a' | 'b'])
+    │         
+
+Because in the expression's type:
+  fun((string()) ->
+    Here the type is:     atom()
+    Context expects type: 'false' | 'true' | ['a' | 'b']
+    No candidate matches in the expected union.
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((string()) -> atom()) is not compatible with fun(('a' | 'b') -> boolean() | ['a' | 'b'])
+  because
+  atom() is not compatible with boolean() | ['a' | 'b']
+  because
+  atom() is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:900:9
+    │
+900 │         fun atom_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:atom_to_list/1.
+Expression has type:   fun((atom()) -> string())
+Context expected type: fun((atom()) -> boolean() | [atom()])
+    │         
+
+Because in the expression's type:
+  fun((atom()) ->
+    Here the type is:     string()
+    Context expects type: boolean() | [atom()]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((atom()) -> string()) is not compatible with fun((atom()) -> boolean() | [atom()])
+  because
+  string() is not compatible with boolean() | [atom()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:900:9
+    │
+900 │         fun atom_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:atom_to_list/1.
+Expression has type:   fun((atom()) -> string())
+Context expected type: fun((dynamic(atom())) -> boolean() | [dynamic(atom())])
+    │         
+
+Because in the expression's type:
+  fun((atom()) ->
+    Here the type is:     string()
+    Context expects type: boolean() | [dynamic(atom())]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((atom()) -> string()) is not compatible with fun((dynamic(atom())) -> boolean() | [dynamic(atom())])
+  because
+  string() is not compatible with boolean() | [dynamic(atom())]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:909:9
+    │
+909 │         fun atom_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:atom_to_list/1.
+Expression has type:   fun((atom()) -> string())
+Context expected type: fun((atom()) -> boolean() | [atom()])
+    │         
+
+Because in the expression's type:
+  fun((atom()) ->
+    Here the type is:     string()
+    Context expects type: boolean() | [atom()]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((atom()) -> string()) is not compatible with fun((atom()) -> boolean() | [atom()])
+  because
+  string() is not compatible with boolean() | [atom()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:909:9
+    │
+909 │         fun atom_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:atom_to_list/1.
+Expression has type:   fun((atom()) -> string())
+Context expected type: fun((dynamic(atom())) -> boolean() | [dynamic(atom())])
+    │         
+
+Because in the expression's type:
+  fun((atom()) ->
+    Here the type is:     string()
+    Context expects type: boolean() | [dynamic(atom())]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((atom()) -> string()) is not compatible with fun((dynamic(atom())) -> boolean() | [dynamic(atom())])
+  because
+  string() is not compatible with boolean() | [dynamic(atom())]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:919:9
+    │
+919 │         fun atom_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:atom_to_list/1.
+Expression has type:   fun((atom()) -> string())
+Context expected type: fun((atom()) -> boolean() | [atom()])
+    │         
+
+Because in the expression's type:
+  fun((atom()) ->
+    Here the type is:     string()
+    Context expects type: boolean() | [atom()]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((atom()) -> string()) is not compatible with fun((atom()) -> boolean() | [atom()])
+  because
+  string() is not compatible with boolean() | [atom()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:919:9
+    │
+919 │         fun atom_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:atom_to_list/1.
+Expression has type:   fun((atom()) -> string())
+Context expected type: fun((dynamic(atom())) -> boolean() | [dynamic(atom())])
+    │         
+
+Because in the expression's type:
+  fun((atom()) ->
+    Here the type is:     string()
+    Context expects type: boolean() | [dynamic(atom())]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((atom()) -> string()) is not compatible with fun((dynamic(atom())) -> boolean() | [dynamic(atom())])
+  because
+  string() is not compatible with boolean() | [dynamic(atom())]
+
+error: clause_not_covered (See https://fb.me/eqwalizer_errors#clause_not_covered)
+    ┌─ check/src/custom.erl:925:1
+    │  
+925 │ ╭ queue_filter_13_neg(Q) ->
+926 │ │     queue:filter(
+927 │ │         fun atom_to_list/1,
+928 │ │         Q
+929 │ │     ),
+930 │ │     ok.
+    │ ╰──────^ Clause is not covered by spec
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:927:9
+    │
+927 │         fun atom_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:atom_to_list/1.
+Expression has type:   fun((atom()) -> string())
+Context expected type: fun((atom()) -> boolean() | [atom()])
+    │         
+
+Because in the expression's type:
+  fun((atom()) ->
+    Here the type is:     string()
+    Context expects type: boolean() | [atom()]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((atom()) -> string()) is not compatible with fun((atom()) -> boolean() | [atom()])
+  because
+  string() is not compatible with boolean() | [atom()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:927:9
+    │
+927 │         fun atom_to_list/1,
+    │         ^^^^^^^^^^^^^^^^^^
+    │         │
+    │         erlang:atom_to_list/1.
+Expression has type:   fun((atom()) -> string())
+Context expected type: fun((dynamic(atom())) -> boolean() | [dynamic(atom())])
+    │         
+
+Because in the expression's type:
+  fun((atom()) ->
+    Here the type is:     string()
+    Context expects type: boolean() | [dynamic(atom())]
+  )
+
+------------------------------ Detailed message ------------------------------
+
+  fun((atom()) -> string()) is not compatible with fun((dynamic(atom())) -> boolean() | [dynamic(atom())])
+  because
+  string() is not compatible with boolean() | [dynamic(atom())]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:955:5
+    │  
+955 │ ╭     lists:keystore(
+956 │ │         a, 1,
+957 │ │         [{foo, b}, {c, d}],
+958 │ │         non_tuple
+959 │ │     ).
+    │ ╰─────^ lists:keystore('a', 1, [{'foo', 'b'}, {'c', 'd'}], 'non_tuple').
+Expression has type:   [{'foo', 'b'} | {'c', 'd'} | dynamic()]
+Context expected type: 'nok'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:958:9
+    │
+958 │         non_tuple
+    │         ^^^^^^^^^ 'non_tuple'.
+Expression has type:   'non_tuple'
+Context expected type: tuple()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:966:5
+    │  
+966 │ ╭     lists:keystore(
+967 │ │         a, 1,
+968 │ │         [non_tuple],
+969 │ │         {replacement}
+970 │ │     ).
+    │ ╰─────^ lists:keystore('a', 1, ['non_tuple'], {'replacement'}).
+Expression has type:   [dynamic() | {'replacement'}]
+Context expected type: 'nok'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:968:9
+    │
+968 │         [non_tuple],
+    │         ^^^^^^^^^^^
+    │         │
+    │         ['non_tuple'].
+Expression has type:   ['non_tuple']
+Context expected type: [tuple()]
+    │         
+
+Because in the expression's type:
+  [
+    Here the type is:     'non_tuple'
+    Context expects type: tuple()
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  ['non_tuple'] is not compatible with [tuple()]
+  because
+  'non_tuple' is not compatible with tuple()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:975:5
+    │  
+975 │ ╭     lists:keystore(
+976 │ │         a, 1,
+977 │ │         non_list,
+978 │ │         {replacement}
+979 │ │     ).
+    │ ╰─────^ lists:keystore('a', 1, 'non_list', {'replacement'}).
+Expression has type:   [dynamic() | {'replacement'}]
+Context expected type: 'nok'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+    ┌─ check/src/custom.erl:977:9
+    │
+977 │         non_list,
+    │         ^^^^^^^^ 'non_list'.
+Expression has type:   'non_list'
+Context expected type: [tuple()]
+
+error: clause_not_covered (See https://fb.me/eqwalizer_errors#clause_not_covered)
+    ┌─ check/src/custom.erl:983:1
+    │  
+983 │ ╭ keystore_7(None) ->
+984 │ │     lists:keystore(
+985 │ │         a, 1,
+986 │ │         None,
+987 │ │         {replacement}
+988 │ │     ).
+    │ ╰─────^ Clause is not covered by spec
+
+error: clause_not_covered (See https://fb.me/eqwalizer_errors#clause_not_covered)
+    ┌─ check/src/custom.erl:991:1
+    │  
+991 │ ╭ keystore_8(None) ->
+992 │ │     lists:keystore(
+993 │ │         a, 1,
+994 │ │         None,
+995 │ │         None
+996 │ │     ).
+    │ ╰─────^ Clause is not covered by spec
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1011:25
+     │
+1011 │     lists:keytake(a, 1, non_tup),
+     │                         ^^^^^^^ 'non_tup'.
+Expression has type:   'non_tup'
+Context expected type: [Tuple]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1011:25
+     │
+1011 │     lists:keytake(a, 1, non_tup),
+     │                         ^^^^^^^ 'non_tup'.
+Expression has type:   'non_tup'
+Context expected type: [dynamic()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1016:25
+     │
+1016 │     lists:keytake(a, 1, non_list),
+     │                         ^^^^^^^^ 'non_list'.
+Expression has type:   'non_list'
+Context expected type: [Tuple]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1016:25
+     │
+1016 │     lists:keytake(a, 1, non_list),
+     │                         ^^^^^^^^ 'non_list'.
+Expression has type:   'non_list'
+Context expected type: [dynamic()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1021:22
+     │
+1021 │     lists:keytake(a, non_num, []),
+     │                      ^^^^^^^ 'non_num'.
+Expression has type:   'non_num'
+Context expected type: number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1038:15
+     │
+1038 │     lists:sum([a, 1]).
+     │               ^^^^^^
+     │               │
+     │               ['a', 1].
+Expression has type:   ['a' | number()]
+Context expected type: [number()]
+     │               
+
+Because in the expression's type:
+  [
+    Here the type is a union type with some valid candidates: number()
+    However the following candidate: 'a'
+    Differs from the expected type:  number()
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  ['a' | number()] is not compatible with [number()]
+  because
+  'a' | number() is not compatible with number()
+  because
+  'a' is not compatible with number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1042:15
+     │
+1042 │     lists:sum(not_a_list).
+     │               ^^^^^^^^^^ 'not_a_list'.
+Expression has type:   'not_a_list'
+Context expected type: [number()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1062:15
+     │
+1062 │     lists:max(not_a_list).
+     │               ^^^^^^^^^^ 'not_a_list'.
+Expression has type:   'not_a_list'
+Context expected type: [T]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1062:15
+     │
+1062 │     lists:max(not_a_list).
+     │               ^^^^^^^^^^ 'not_a_list'.
+Expression has type:   'not_a_list'
+Context expected type: [dynamic()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1082:15
+     │
+1082 │     lists:min(not_a_list).
+     │               ^^^^^^^^^^ 'not_a_list'.
+Expression has type:   'not_a_list'
+Context expected type: [T]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1082:15
+     │
+1082 │     lists:min(not_a_list).
+     │               ^^^^^^^^^^ 'not_a_list'.
+Expression has type:   'not_a_list'
+Context expected type: [dynamic()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1100:5
+     │
+1100 │     proplists:get_value(k, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value('k', L).
+Expression has type:   term()
+Context expected type: pid() | 'undefined'
+     │     
+
+  term() is not compatible with pid() | 'undefined'
+  because
+  term() is not compatible with pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1106:5
+     │
+1106 │     proplists:get_value(k, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value('k', L).
+Expression has type:   term()
+Context expected type: pid() | 'undefined' | 'v'
+     │     
+
+  term() is not compatible with pid() | 'undefined' | 'v'
+  because
+  term() is not compatible with pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1111:5
+     │
+1111 │     proplists:get_value(k, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^ proplists:get_value('k', L).
+Expression has type:   term()
+Context expected type: pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1117:5
+     │
+1117 │     proplists:get_value(k, L, 3).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value('k', L, 3).
+Expression has type:   term()
+Context expected type: pid() | number()
+     │     
+
+  term() is not compatible with pid() | number()
+  because
+  term() is not compatible with pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1123:5
+     │
+1123 │     proplists:get_value(k, L, my_default).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value('k', L, 'my_default').
+Expression has type:   term()
+Context expected type: 'v1' | 'v2' | 'my_default'
+     │     
+
+  term() is not compatible with 'v1' | 'v2' | 'my_default'
+  because
+  term() is not compatible with 'v1'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1129:5
+     │
+1129 │     proplists:get_value(k, L, my_default).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ proplists:get_value('k', L, 'my_default').
+Expression has type:   term()
+Context expected type: 'v'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1134:28
+     │
+1134 │     proplists:get_value(k, b).
+     │                            ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1139:5
+     │
+1139 │     proplists:get_value(k, []).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^ proplists:get_value('k', []).
+Expression has type:   term()
+Context expected type: 'default'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1144:1
+     │
+1144 │ proplists:get_value(k, [], my_default).
+     │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ proplists:get_value('k', [], 'my_default').
+Expression has type:   term()
+Context expected type: 'my_default'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1149:28
+     │
+1149 │     proplists:get_value(k, b, my_default).
+     │                            ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1154:5
+     │
+1154 │     proplists:get_bool(b, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^ proplists:get_bool('b', L).
+Expression has type:   boolean()
+Context expected type: 'true'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1160:5
+     │
+1160 │     proplists:get_all_values(k, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_all_values('k', L).
+Expression has type:   [term()]
+Context expected type: [pid() | 'default']
+     │     
+
+Because in the expression's type:
+  [
+    Here the type is:     term()
+    Context expects type: pid() | 'default'
+    No candidate matches in the expected union.
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [term()] is not compatible with [pid() | 'default']
+  because
+  term() is not compatible with pid() | 'default'
+  because
+  term() is not compatible with pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1166:5
+     │
+1166 │     proplists:get_all_values(k, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_all_values('k', L).
+Expression has type:   [term()]
+Context expected type: [pid() | 'default' | 'v']
+     │     
+
+Because in the expression's type:
+  [
+    Here the type is:     term()
+    Context expects type: pid() | 'default' | 'v'
+    No candidate matches in the expected union.
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [term()] is not compatible with [pid() | 'default' | 'v']
+  because
+  term() is not compatible with pid() | 'default' | 'v'
+  because
+  term() is not compatible with pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1171:5
+     │
+1171 │     proplists:get_all_values(k, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_all_values('k', L).
+Expression has type:   [term()]
+Context expected type: [pid()]
+     │     
+
+Because in the expression's type:
+  [
+    Here the type is:     term()
+    Context expects type: pid()
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [term()] is not compatible with [pid()]
+  because
+  term() is not compatible with pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1176:5
+     │
+1176 │     proplists:get_all_values(k, []).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_all_values('k', []).
+Expression has type:   [term()]
+Context expected type: []
+     │     
+
+Because in the expression's type:
+  [
+    Here the type is:     term()
+    Context expects type: none()
+  ]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1181:5
+     │
+1181 │     proplists:get_all_values(k, b).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_all_values('k', 'b').
+Expression has type:   [term()]
+Context expected type: []
+     │     
+
+Because in the expression's type:
+  [
+    Here the type is:     term()
+    Context expects type: none()
+  ]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1181:33
+     │
+1181 │     proplists:get_all_values(k, b).
+     │                                 ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1186:27
+     │
+1186 │     proplists:get_bool(b, b).
+     │                           ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1191:5
+     │
+1191 │     proplists:get_keys(L).
+     │     ^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_keys(L).
+Expression has type:   [term()]
+Context expected type: ['c']
+     │     
+
+Because in the expression's type:
+  [
+    Here the type is:     term()
+    Context expects type: 'c'
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [term()] is not compatible with ['c']
+  because
+  term() is not compatible with 'c'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1197:5
+     │
+1197 │     proplists:get_keys(L).
+     │     ^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_keys(L).
+Expression has type:   [term()]
+Context expected type: ['a' | 'b' | 'c']
+     │     
+
+Because in the expression's type:
+  [
+    Here the type is:     term()
+    Context expects type: 'a' | 'b' | 'c'
+    No candidate matches in the expected union.
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [term()] is not compatible with ['a' | 'b' | 'c']
+  because
+  term() is not compatible with 'a' | 'b' | 'c'
+  because
+  term() is not compatible with 'a'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1202:24
+     │
+1202 │     proplists:get_keys(a).
+     │                        ^ 'a'.
+Expression has type:   'a'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1207:5
+     │    
+1207 │ ╭ ╭     proplists:get_keys(
+1208 │ │ │         [{a, b, c}]
+1209 │ │ │     ).
+     │ ╰─│─────^ proplists:get_keys([{'a', 'b', 'c'}]).
+Expression has type:   [term()]
+Context expected type: ['a']
+     │   ╰─────' 
+
+Because in the expression's type:
+  [
+    Here the type is:     term()
+    Context expects type: 'a'
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [term()] is not compatible with ['a']
+  because
+  term() is not compatible with 'a'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1215:5
+     │
+1215 │     proplists:get_value(k, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value('k', L).
+Expression has type:   term()
+Context expected type: 'a' | pid()
+     │     
+
+  term() is not compatible with 'a' | pid()
+  because
+  term() is not compatible with 'a'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1220:5
+     │
+1220 │     proplists:get_value(k, b).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value('k', 'b').
+Expression has type:   term()
+Context expected type: 'a' | pid()
+     │     
+
+  term() is not compatible with 'a' | pid()
+  because
+  term() is not compatible with 'a'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1220:28
+     │
+1220 │     proplists:get_value(k, b).
+     │                            ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1225:1
+     │
+1225 │ proplists:lookup(self(), [a, {b, true}]).
+     │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │ │
+     │ proplists:lookup(erlang:self(), ['a', {'b', 'true'}]).
+Expression has type:   'none' | tuple()
+Context expected type: {'b', 'true'}
+     │ 
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: tuple()
+  However the following candidate: 'none'
+  Differs from the expected type:  {'b', 'true'}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1229:25
+     │
+1229 │     proplists:lookup(a, b).
+     │                         ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1239:5
+     │
+1239 │     proplists:lookup(k, []).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:lookup('k', []).
+Expression has type:   'none' | tuple()
+Context expected type: 'none'
+     │     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: 'none'
+  However the following candidate: tuple()
+  Differs from the expected type:  'none'
+
+------------------------------ Detailed message ------------------------------
+
+  'none' | tuple() is not compatible with 'none'
+  because
+  tuple() is not compatible with 'none'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1252:29
+     │
+1252 │     proplists:lookup_all(a, b).
+     │                             ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1265:5
+     │    
+1265 │ ╭ ╭     proplists:lookup_all(
+1266 │ │ │         self(),
+1267 │ │ │         []
+1268 │ │ │     ).
+     │ ╰─│─────^ proplists:lookup_all(erlang:self(), []).
+Expression has type:   [tuple()]
+Context expected type: []
+     │   ╰─────' 
+
+Because in the expression's type:
+  [
+    Here the type is:     tuple()
+    Context expects type: none()
+  ]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1291:34
+     │
+1291 │     proplists:is_defined(self(), b).
+     │                                  ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1295:25
+     │
+1295 │     proplists:delete(k, b).
+     │                         ^ 'b'.
+Expression has type:   'b'
+Context expected type: [A]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1295:25
+     │
+1295 │     proplists:delete(k, b).
+     │                         ^ 'b'.
+Expression has type:   'b'
+Context expected type: [dynamic()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1311:5
+     │
+1311 │     proplists:split(L, Ks).
+     │     ^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:split(L, Ks).
+Expression has type:   {[[term()]], [term()]}
+Context expected type: {[plist('a', 'b')], plist('a', 'b')}
+     │     
+
+Because in the expression's type:
+  { 
+    [
+      [
+        Here the type is:     term()
+        Context expects type: 'a' | {'a', 'b'}
+        No candidate matches in the expected union.
+      ]
+    ]
+  , [term()]}
+
+------------------------------ Detailed message ------------------------------
+
+  at tuple index 1:
+  {[[term()]], [term()]} is not compatible with {[plist('a', 'b')], plist('a', 'b')}
+  because
+  [[term()]] is not compatible with [plist('a', 'b')]
+  because
+  [term()] is not compatible with plist('a', 'b')
+  because
+  [term()] is not compatible with ['a' | {'a', 'b'}]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1315:21
+     │
+1315 │     proplists:split(b, []).
+     │                     ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1319:25
+     │
+1319 │     proplists:split([], b).
+     │                         ^ 'b'.
+Expression has type:   'b'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1324:22
+     │
+1324 │     proplists:to_map(b).
+     │                      ^ 'b'.
+Expression has type:   'b'
+Context expected type: [atom() | {term(), term()} | term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1358:24
+     │
+1358 │     proplists:from_map(b).
+     │                        ^ 'b'.
+Expression has type:   'b'
+Context expected type: #{K => V}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1358:24
+     │
+1358 │     proplists:from_map(b).
+     │                        ^ 'b'.
+Expression has type:   'b'
+Context expected type: #{dynamic() => dynamic()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1363:5
+     │
+1363 │     proplists:get_value(a, [a]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value('a', ['a']).
+Expression has type:   term()
+Context expected type: 'true' | 'undefined'
+     │     
+
+  term() is not compatible with 'true' | 'undefined'
+  because
+  term() is not compatible with 'true'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1368:5
+     │
+1368 │     proplists:get_value(X, [a]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value(X, ['a']).
+Expression has type:   term()
+Context expected type: 'true' | 'undefined'
+     │     
+
+  term() is not compatible with 'true' | 'undefined'
+  because
+  term() is not compatible with 'true'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1373:5
+     │
+1373 │     proplists:get_value(a, [a], b).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     proplists:get_value('a', ['a'], 'b').
+Expression has type:   term()
+Context expected type: 'true' | 'b'
+     │     
+
+  term() is not compatible with 'true' | 'b'
+  because
+  term() is not compatible with 'true'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1416:5
+     │
+1416 │     file:consult(some_file).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^ file:consult('some_file').
+Expression has type:   {'ok', [dynamic()]} | {'error', {number(), atom(), term()} | 'terminated' | 'badarg' | file:posix() | 'system_limit'}
+Context expected type: 'nok'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1428:5
+     │
+1428 │     lists:keysort(2, [{a, c}, {b, d}]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ lists:keysort(2, [{'a', 'c'}, {'b', 'd'}]).
+Expression has type:   [{'a', 'c'} | {'b', 'd'}]
+Context expected type: none()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1432:22
+     │
+1432 │     lists:keysort(1, [3]).
+     │                      ^^^
+     │                      │
+     │                      [3].
+Expression has type:   [number()]
+Context expected type: [tuple()]
+     │                      
+
+Because in the expression's type:
+  [
+    Here the type is:     number()
+    Context expects type: tuple()
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [number()] is not compatible with [tuple()]
+  because
+  number() is not compatible with tuple()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1448:5
+     │    
+1448 │ ╭ ╭     lists:filtermap(
+1449 │ │ │         fun(X) when X div 2 =:= 0 ->
+1450 │ │ │             {true, integer_to_list(X)};
+1451 │ │ │         (X) ->
+     · │ │
+1454 │ │ │         [1, 2, 3, 4]
+1455 │ │ │     ).
+     │ ╰─│─────^ lists:filtermap(fun, [1, 2, 3, 4]).
+Expression has type:   [string() | number()]
+Context expected type: [number()]
+     │   ╰─────' 
+
+Because in the expression's type:
+  [
+    Here the type is a union type with some valid candidates: number()
+    However the following candidate: string()
+    Differs from the expected type:  number()
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [string() | number()] is not compatible with [number()]
+  because
+  string() | number() is not compatible with number()
+  because
+  string() is not compatible with number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1482:5
+     │
+1482 │     erlang:min(X, Y).
+     │     ^^^^^^^^^^^^^^^^ erlang:min(X, Y).
+Expression has type:   number()
+Context expected type: none()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1497:5
+     │
+1497 │     erlang:max(X, Y).
+     │     ^^^^^^^^^^^^^^^^ erlang:max(X, Y).
+Expression has type:   atom() | number()
+Context expected type: none()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1523:9
+     │
+1523 │     abs(Atom).
+     │         ^^^^ Atom.
+Expression has type:   'a'
+Context expected type: number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1536:31
+     │
+1536 │ seq3_4_wip_neg() -> lists:seq(a, 2, 1).
+     │                               ^ 'a'.
+Expression has type:   'a'
+Context expected type: number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1539:30
+     │
+1539 │ seq3_5_neg() -> lists:seq(1, a, 1).
+     │                              ^ 'a'.
+Expression has type:   'a'
+Context expected type: number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1542:33
+     │
+1542 │ seq3_6_neg() -> lists:seq(1, 2, a).
+     │                                 ^ 'a'.
+Expression has type:   'a'
+Context expected type: number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1570:31
+     │
+1570 │ seq2_4_wip_neg() -> lists:seq(a, 2).
+     │                               ^ 'a'.
+Expression has type:   'a'
+Context expected type: number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1573:30
+     │
+1573 │ seq2_5_neg() -> lists:seq(1, a).
+     │                              ^ 'a'.
+Expression has type:   'a'
+Context expected type: number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1622:5
+     │  
+1622 │ ╭     timer:tc(
+1623 │ │         fun() ->
+1624 │ │             err
+1625 │ │         end
+1626 │ │     ).
+     │ ╰─────^ timer:tc(fun).
+Expression has type:   {number(), 'err'}
+Context expected type: pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1635:5
+     │
+1635 │     ets:lookup(tab, Any).
+     │     ^^^^^^^^^^^^^^^^^^^^ ets:lookup('tab', Any).
+Expression has type:   [dynamic()]
+Context expected type: pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1639:5
+     │
+1639 │     ets:lookup("not atom", Any).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ ets:lookup(string_lit, Any).
+Expression has type:   [dynamic()]
+Context expected type: pid()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1639:16
+     │
+1639 │     ets:lookup("not atom", Any).
+     │                ^^^^^^^^^^ string_lit.
+Expression has type:   string()
+Context expected type: ets:tab()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1663:18
+     │
+1663 │     ets:tab2list("not atom").
+     │                  ^^^^^^^^^^ string_lit.
+Expression has type:   string()
+Context expected type: ets:tab()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1702:23
+     │
+1702 │     lists:flatten([], 1).
+     │                       ^ 1.
+Expression has type:   number()
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1711:19
+     │
+1711 │     lists:flatten(3).
+     │                   ^ 3.
+Expression has type:   number()
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1724:8
+     │
+1724 │     -> lists:flatten(X).
+     │        ^^^^^^^^^^^^^^^^
+     │        │
+     │        lists:flatten(X).
+Expression has type:   [{A, B} | {B, A}]
+Context expected type: [{A, B}]
+     │        
+
+Because in the expression's type:
+  [
+    { 
+      Here the type is:     B
+      Context expects type: A
+    , A}
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [{A, B} | {B, A}] is not compatible with [{A, B}]
+  because
+  {A, B} | {B, A} is not compatible with {A, B}
+  because
+  at tuple index 1:
+  {B, A} is not compatible with {A, B}
+  because
+  B is not compatible with A
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1757:5
+     │    
+1757 │ ╭ ╭     maps:without(
+1758 │ │ │         [a, c, DOrE],
+1759 │ │ │         #{
+1760 │ │ │             a => ka,
+     · │ │
+1764 │ │ │         }
+1765 │ │ │     ).
+     │ ╰─│─────^ maps:without(['a', 'c', DOrE], #{..}).
+Expression has type:   #{a => 'ka', b => atom(), c => pid(), d => 'kd'}
+Context expected type: #{b => atom()}
+     │   ╰─────' 
+
+Because in the expression's type:
+  Here the type is:     #{a => ...}
+  Context expects type: #{...}
+  The expected map has no corresponding key for: a.
+
+------------------------------ Detailed message ------------------------------
+
+key `a` is declared in the former but not in the latter and the latter map has no default association
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1769:18
+     │
+1769 │     maps:without(non_list, #{}).
+     │                  ^^^^^^^^ 'non_list'.
+Expression has type:   'non_list'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1773:22
+     │
+1773 │     maps:without([], non_map).
+     │                      ^^^^^^^ 'non_map'.
+Expression has type:   'non_map'
+Context expected type: #{term() => term()}
+
+error: clause_not_covered (See https://fb.me/eqwalizer_errors#clause_not_covered)
+     ┌─ check/src/custom.erl:1808:1
+     │  
+1808 │ ╭ maps_without_12_neg(None) ->
+1809 │ │     maps:without(
+1810 │ │         [a, b],
+1811 │ │         None
+1812 │ │     ).
+     │ ╰─────^ Clause is not covered by spec
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1818:5
+     │    
+1818 │ ╭ ╭     maps:without(
+1819 │ │ │         Keys,
+1820 │ │ │         #{a => self(), b => self()}
+1821 │ │ │     ).
+     │ ╰─│─────^ maps:without(Keys, #{..}).
+Expression has type:   #{a => pid(), b => pid()}
+Context expected type: #{b := pid()}
+     │   ╰─────' 
+
+Because in the expression's type:
+  Here the type is:     #{b => ..., ...}
+  Context expects type: #{b := ..., ...}
+  The type of the expression is missing the following required keys: b.
+
+------------------------------ Detailed message ------------------------------
+
+key `b` is declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1826:5
+     │    
+1826 │ ╭ ╭     maps:without(
+1827 │ │ │         [a | improper_tail],
+1828 │ │ │         #{a => self(), b => self()}
+1829 │ │ │     ).
+     │ ╰─│─────^ maps:without(['a' | 'improper_tail'], #{..}).
+Expression has type:   #{a => pid(), b => pid()}
+Context expected type: #{b := pid()}
+     │   ╰─────' 
+
+Because in the expression's type:
+  Here the type is:     #{b => ..., ...}
+  Context expects type: #{b := ..., ...}
+  The type of the expression is missing the following required keys: b.
+
+------------------------------ Detailed message ------------------------------
+
+key `b` is declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1827:12
+     │
+1827 │         [a | improper_tail],
+     │            ^^^^^^^^^^^^^^^^ 'improper_tail'.
+Expression has type:   'improper_tail'
+Context expected type: [term()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1837:5
+     │    
+1837 │ ╭ ╭     maps:without(
+1838 │ │ │         Keys,
+1839 │ │ │         #{a => ka, b => self()}
+1840 │ │ │     ).
+     │ ╰─│─────^ maps:without(Keys, #{..}).
+Expression has type:   #{a => 'ka', b => pid()}
+Context expected type: #{b := pid()}
+     │   ╰─────' 
+
+Because in the expression's type:
+  Here the type is:     #{b => ..., ...}
+  Context expects type: #{b := ..., ...}
+  The type of the expression is missing the following required keys: b.
+
+------------------------------ Detailed message ------------------------------
+
+key `b` is declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1854:5
+     │
+1854 │     maps:without([a, b], M).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     maps:without(['a', 'b'], M).
+Expression has type:   #{c := 'cv', d := 'dv'} | #{c := 'cv', e => 'ev'}
+Context expected type: #{c := atom()}
+     │     
+
+Because in the expression's type:
+  Here the type is:     #{d := ...}
+  Context expects type: #{...}
+  The expected map has no corresponding key for: d.
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1916:23
+     │
+1916 │     custom_overloaded(X).
+     │                       ^
+     │                       │
+     │                       X.
+Expression has type:   term()
+Context expected type: atom() | binary()
+     │                       
+
+  term() is not compatible with atom() | binary()
+  because
+  term() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:1939:5
+     │
+1939 │     {A, N}.
+     │     ^^^^^^
+     │     │
+     │     {A, N}.
+Expression has type:   {atom(), number() | pid()}
+Context expected type: {atom(), number()}
+     │     
+
+Because in the expression's type:
+  { atom(), 
+    Here the type is a union type with some valid candidates: number()
+    However the following candidate: pid()
+    Differs from the expected type:  number()
+  }
+
+------------------------------ Detailed message ------------------------------
+
+  at tuple index 2:
+  {atom(), number() | pid()} is not compatible with {atom(), number()}
+  because
+  number() | pid() is not compatible with number()
+  because
+  pid() is not compatible with number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2041:5
+     │
+2041 │     filename:join(["server", "erl"]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     filename:join([string_lit, string_lit]).
+Expression has type:   file:filename_all()
+Context expected type: file:filename()
+     │     
+
+Because in the expression's type:
+  Here the type is:     string() | binary()
+  Context expects type: string()
+
+------------------------------ Detailed message ------------------------------
+
+  file:filename_all() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2046:5
+     │
+2046 │     filename:join(["server", <<>>]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     filename:join([string_lit, <<..>>]).
+Expression has type:   file:filename_all()
+Context expected type: file:filename()
+     │     
+
+Because in the expression's type:
+  Here the type is:     string() | binary()
+  Context expects type: string()
+
+------------------------------ Detailed message ------------------------------
+
+  file:filename_all() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2051:5
+     │
+2051 │     filename:join([<<>>, ""]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     filename:join([<<..>>, string_lit]).
+Expression has type:   file:filename_all()
+Context expected type: file:filename()
+     │     
+
+Because in the expression's type:
+  Here the type is:     string() | binary()
+  Context expects type: string()
+
+------------------------------ Detailed message ------------------------------
+
+  file:filename_all() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2066:5
+     │
+2066 │     filename:join([<<>>, <<>>]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     filename:join([<<..>>, <<..>>]).
+Expression has type:   file:filename_all()
+Context expected type: binary()
+     │     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: binary()
+  However the following candidate: string()
+  Differs from the expected type:  binary()
+
+------------------------------ Detailed message ------------------------------
+
+  file:filename_all() is not compatible with binary()
+  because
+  string() | binary() is not compatible with binary()
+  because
+  string() is not compatible with binary()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2081:19
+     │
+2081 │     filename:join([<<>>, self()]).
+     │                   ^^^^^^^^^^^^^^
+     │                   │
+     │                   [<<..>>, erlang:self()].
+Expression has type:   [binary() | pid()]
+Context expected type: [file:name_all()]
+     │                   
+
+Because in the expression's type:
+  [
+    Here the type is a union type with some valid candidates: binary()
+    However the following candidate: pid()
+    Differs from the expected type:  string() | atom() | file:deep_list() | binary()
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [binary() | pid()] is not compatible with [file:name_all()]
+  because
+  binary() | pid() is not compatible with file:name_all()
+  because
+  binary() | pid() is not compatible with string() | atom() | file:deep_list() | binary()
+  because
+  pid() is not compatible with string() | atom() | file:deep_list() | binary()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2086:5
+     │
+2086 │     filename:join("server", "erl").
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     filename:join(string_lit, string_lit).
+Expression has type:   file:filename_all()
+Context expected type: file:filename()
+     │     
+
+Because in the expression's type:
+  Here the type is:     string() | binary()
+  Context expects type: string()
+
+------------------------------ Detailed message ------------------------------
+
+  file:filename_all() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2091:5
+     │
+2091 │     filename:join("server", <<>>).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     filename:join(string_lit, <<..>>).
+Expression has type:   file:filename_all()
+Context expected type: file:filename()
+     │     
+
+Because in the expression's type:
+  Here the type is:     string() | binary()
+  Context expects type: string()
+
+------------------------------ Detailed message ------------------------------
+
+  file:filename_all() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2096:5
+     │
+2096 │     filename:join(<<>>, "").
+     │     ^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     filename:join(<<..>>, string_lit).
+Expression has type:   file:filename_all()
+Context expected type: file:filename()
+     │     
+
+Because in the expression's type:
+  Here the type is:     string() | binary()
+  Context expects type: string()
+
+------------------------------ Detailed message ------------------------------
+
+  file:filename_all() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with file:filename()
+  because
+  string() | binary() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2111:5
+     │
+2111 │     filename:join(atom, <<>>).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     filename:join('atom', <<..>>).
+Expression has type:   file:filename_all()
+Context expected type: binary()
+     │     
+
+Because in the expression's type:
+  Here the type is a union type with some valid candidates: binary()
+  However the following candidate: string()
+  Differs from the expected type:  binary()
+
+------------------------------ Detailed message ------------------------------
+
+  file:filename_all() is not compatible with binary()
+  because
+  string() | binary() is not compatible with binary()
+  because
+  string() is not compatible with binary()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2121:25
+     │
+2121 │     filename:join(<<>>, self()).
+     │                         ^^^^^^
+     │                         │
+     │                         erlang:self().
+Expression has type:   pid()
+Context expected type: file:name_all()
+     │                         
+
+Because in the expression's type:
+  Here the type is:     pid()
+  Context expects type: string() | atom() | file:deep_list() | binary()
+  No candidate matches in the expected union.
+
+------------------------------ Detailed message ------------------------------
+
+  pid() is not compatible with file:name_all()
+  because
+  pid() is not compatible with string() | atom() | file:deep_list() | binary()
+  because
+  pid() is not compatible with string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2150:5
+     │    
+2150 │ ╭ ╭     queue:filter(
+2151 │ │ │         fun my_filter1/1,
+2152 │ │ │         Q
+2153 │ │ │     ).
+     │ ╰─│─────^ queue:filter(my_filter1/1, Q).
+Expression has type:   queue:queue(atom() | number())
+Context expected type: queue:queue(number())
+     │   ╰─────' 
+
+Because in the expression's type:
+  { 
+    [
+      Here the type is a union type with some valid candidates: number()
+      However the following candidate: atom()
+      Differs from the expected type:  number()
+    ]
+  , [atom() | number()]}
+
+------------------------------ Detailed message ------------------------------
+
+  queue:queue(atom() | number()) is not compatible with queue:queue(number())
+  because
+  {[atom() | number()], [atom() | number()]} is not compatible with queue:queue(number())
+  because
+  at tuple index 1:
+  {[atom() | number()], [atom() | number()]} is not compatible with {[number()], [number()]}
+  because
+  [atom() | number()] is not compatible with [number()]
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2191:5
+     │
+2191 │     M3.
+     │     ^^
+     │     │
+     │     M3.
+Expression has type:   #{count := number(), module := 'foo'} | #{module := 'foo'}
+Context expected type: state1()
+     │     
+
+Because in the expression's type:
+  The type is a union type with some valid candidates: #{count := number(), module := 'foo'}
+  However, the following candidate doesn't match:
+  Here the type is:     #{...}
+  Context expects type: #{count := ..., ...}
+  The type of the expression is missing the following required keys: count.
+
+------------------------------ Detailed message ------------------------------
+
+  #{count := number(), module := 'foo'} | #{module := 'foo'} is not compatible with state1()
+  because
+  #{count := number(), module := 'foo'} | #{module := 'foo'} is not compatible with #{count := number(), module := atom()}
+  because
+  #{module := 'foo'} is not compatible with #{count := number(), module := atom()}
+  key `count` is declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2223:13
+     │
+2223 │             Atom + Sum
+     │             ^^^^ Atom.
+Expression has type:   atom()
+Context expected type: number()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2279:5
+     │
+2279 │     maps:remove(A, M).
+     │     ^^^^^^^^^^^^^^^^^
+     │     │
+     │     maps:remove(A, M).
+Expression has type:   #{a => number()}
+Context expected type: #{a := number()}
+     │     
+
+Because in the expression's type:
+  Here the type is:     #{a => ..., ...}
+  Context expects type: #{a := ..., ...}
+  The type of the expression is missing the following required keys: a.
+
+------------------------------ Detailed message ------------------------------
+
+key `a` is declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2320:5
+     │    
+2320 │ ╭ ╭     maps:filtermap(
+2321 │ │ │         fun
+2322 │ │ │             (a, V) -> true;
+2323 │ │ │             (b, V) -> {true, atom_to_binary(V)};
+     · │ │
+2326 │ │ │         M
+2327 │ │ │     ).
+     │ ╰─│─────^ maps:filtermap(fun, M).
+Expression has type:   #{a => atom() | binary(), b => atom() | binary(), c => atom() | binary()}
+Context expected type: #{a := atom(), b := binary()}
+     │   ╰─────' 
+
+Because in the expression's type:
+  Here the type is:     #{a => ..., b => ..., ...}
+  Context expects type: #{a := ..., b := ..., ...}
+  The type of the expression is missing the following required keys: a, b.
+
+------------------------------ Detailed message ------------------------------
+
+keys `a`, `b` are declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2342:5
+     │    
+2342 │ ╭ ╭     maps:filtermap(
+2343 │ │ │         fun (_, V) ->
+2344 │ │ │             {true, atom_to_binary(V)}
+2345 │ │ │         end,
+2346 │ │ │         M
+2347 │ │ │     ).
+     │ ╰─│─────^ maps:filtermap(fun, M).
+Expression has type:   #{atom() => binary()}
+Context expected type: #{atom() => atom()}
+     │   ╰─────' 
+
+Because in the expression's type:
+  #{ atom() =>
+    Here the type is:     binary()
+    Context expects type: atom()
+  , ... }
+
+------------------------------ Detailed message ------------------------------
+
+  #{atom() => binary()} is not compatible with #{atom() => atom()}
+  the default associations are not compatible
+  because
+  binary() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2354:23
+     │
+2354 │         fun (_, _) -> err end,
+     │                       ^^^
+     │                       │
+     │                       'err'.
+Expression has type:   'err'
+Context expected type: boolean() | {'true', term()}
+     │                       
+
+Because in the expression's type:
+  Here the type is:     'err'
+  Context expects type: 'false' | 'true' | {'true', term()}
+  No candidate matches in the expected union.
+
+------------------------------ Detailed message ------------------------------
+
+  'err' is not compatible with boolean() | {'true', term()}
+  because
+  'err' is not compatible with 'false'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2362:5
+     │    
+2362 │ ╭ ╭     maps:filtermap(
+2363 │ │ │         fun (_, V) -> {true, atom_to_binary(V)} end,
+2364 │ │ │         M
+2365 │ │ │     ).
+     │ ╰─│─────^ maps:filtermap(fun, M).
+Expression has type:   #{atom() => binary()}
+Context expected type: #{atom() => atom()}
+     │   ╰─────' 
+
+Because in the expression's type:
+  #{ atom() =>
+    Here the type is:     binary()
+    Context expects type: atom()
+  , ... }
+
+------------------------------ Detailed message ------------------------------
+
+  #{atom() => binary()} is not compatible with #{atom() => atom()}
+  the default associations are not compatible
+  because
+  binary() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2363:45
+     │
+2363 │         fun (_, V) -> {true, atom_to_binary(V)} end,
+     │                                             ^ V.
+Expression has type:   binary()
+Context expected type: atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2377:5
+     │
+2377 │     re:replace(Subj, "+", "-", [{return, binary}]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ re:replace(Subj, string_lit, string_lit, [{'return', 'binary'}]).
+Expression has type:   binary()
+Context expected type: string()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2381:5
+     │
+2381 │     re:replace(Subj, "+", "-", [{return, list}]).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ re:replace(Subj, string_lit, string_lit, [{'return', 'list'}]).
+Expression has type:   string()
+Context expected type: binary()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2385:22
+     │
+2385 │     Res = re:replace(Subj, "+", "-", [{return, list}]),
+     │                      ^^^^
+     │                      │
+     │                      Subj.
+Expression has type:   atom()
+Context expected type: iodata() | unicode:charlist()
+     │                      
+
+Because in the expression's type:
+  Here the type is:     atom()
+  Context expects type: iolist() | binary()
+  No candidate matches in the expected union.
+
+------------------------------ Detailed message ------------------------------
+
+  atom() is not compatible with iodata() | unicode:charlist()
+  because
+  atom() is not compatible with iolist()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2386:5
+     │
+2386 │     Res.
+     │     ^^^ Res.
+Expression has type:   string()
+Context expected type: binary()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2390:38
+     │
+2390 │     Res = re:replace(Subj, "+", "-", [{return, something}]),
+     │                                      ^^^^^^^^^^^^^^^^^^^^^
+     │                                      │
+     │                                      [{'return', 'something'}].
+Expression has type:   [{'return', 'something'}]
+Context expected type: ['notempty_atstart' | 'noteol' | 'notbol' | 'global' | {'match_limit_recursion', number()} | re:compile_option() | {'match_limit', number()} | {'offset', number()} | 'notempty' | {'return', 'iodata' | 'list' | 'binary'} | 'anchored']
+     │                                      
+
+Because in the expression's type:
+  [
+    { 'return', 
+      Here the type is:     'something'
+      Context expects type: 'iodata' | 'list' | 'binary'
+      No candidate matches in the expected union.
+    }
+  ]
+
+------------------------------ Detailed message ------------------------------
+
+  [{'return', 'something'}] is not compatible with ['notempty_atstart' | 'noteol' | 'notbol' | 'global' | {'match_limit_recursion', number()} | re:compile_option() | {'match_limit', number()} | {'offset', number()} | 'notempty' | {'return', 'iodata' | 'list' | 'binary'} | 'anchored']
+  because
+  {'return', 'something'} is not compatible with 'notempty_atstart' | 'noteol' | 'notbol' | 'global' | {'match_limit_recursion', number()} | re:compile_option() | {'match_limit', number()} | {'offset', number()} | 'notempty' | {'return', 'iodata' | 'list' | 'binary'} | 'anchored'
+  because
+  at tuple index 2:
+  {'return', 'something'} is not compatible with {'return', 'iodata' | 'list' | 'binary'}
+  because
+  'something' is not compatible with 'iodata' | 'list' | 'binary'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2506:5
+     │
+2506 │     lists:partition(fun is_number/1, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     lists:partition(fun, L).
+Expression has type:   {[number()], [atom()]}
+Context expected type: {[atom()], [number()]}
+     │     
+
+Because in the expression's type:
+  { 
+    [
+      Here the type is:     number()
+      Context expects type: atom()
+    ]
+  , [atom()]}
+
+------------------------------ Detailed message ------------------------------
+
+  at tuple index 1:
+  {[number()], [atom()]} is not compatible with {[atom()], [number()]}
+  because
+  [number()] is not compatible with [atom()]
+  because
+  number() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2518:5
+     │
+2518 │     lists:partition(fun({_Term, V}) -> is_number(V) end, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     lists:partition(fun, L).
+Expression has type:   {[{term(), number()}], [{term(), atom()}]}
+Context expected type: {[{term(), atom()}], [{term(), number()}]}
+     │     
+
+Because in the expression's type:
+  { 
+    [
+      { term(), 
+        Here the type is:     number()
+        Context expects type: atom()
+      }
+    ]
+  , [{term(), atom()}]}
+
+------------------------------ Detailed message ------------------------------
+
+  at tuple index 1:
+  {[{term(), number()}], [{term(), atom()}]} is not compatible with {[{term(), atom()}], [{term(), number()}]}
+  because
+  [{term(), number()}] is not compatible with [{term(), atom()}]
+  because
+  at tuple index 2:
+  {term(), number()} is not compatible with {term(), atom()}
+  because
+  number() is not compatible with atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2536:5
+     │
+2536 │     lists:partition(fun({ok, _}) -> true; (_) -> false end, L).
+     │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     │     │
+     │     lists:partition(fun, L).
+Expression has type:   {[{'ok', atom()}], [{'ok', atom()} | {'error', term()}]}
+Context expected type: {[{'ok', atom()}], [{'error', term()}]}
+     │     
+
+Because in the expression's type:
+  { [{'ok', atom()}], 
+    [
+      { 
+        Here the type is:     'ok'
+        Context expects type: 'error'
+      , atom()}
+    ]
+  }
+
+------------------------------ Detailed message ------------------------------
+
+  at tuple index 2:
+  {[{'ok', atom()}], [{'ok', atom()} | {'error', term()}]} is not compatible with {[{'ok', atom()}], [{'error', term()}]}
+  because
+  [{'ok', atom()} | {'error', term()}] is not compatible with [{'error', term()}]
+  because
+  {'ok', atom()} | {'error', term()} is not compatible with {'error', term()}
+  because
+  at tuple index 1:
+  {'ok', atom()} is not compatible with {'error', term()}
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2576:33
+     │
+2576 │ maps_intersect_2_neg(M1, M2) -> maps:intersect(M1, M2).
+     │                                 ^^^^^^^^^^^^^^^^^^^^^^
+     │                                 │
+     │                                 maps:intersect(M1, M2).
+Expression has type:   #{a => number()}
+Context expected type: #{a := number()}
+     │                                 
+
+Because in the expression's type:
+  Here the type is:     #{a => ..., ...}
+  Context expects type: #{a := ..., ...}
+  The type of the expression is missing the following required keys: a.
+
+------------------------------ Detailed message ------------------------------
+
+key `a` is declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2586:33
+     │
+2586 │ maps_intersect_4_neg(M1, M2) -> maps:intersect(M1, M2).
+     │                                 ^^^^^^^^^^^^^^^^^^^^^^
+     │                                 │
+     │                                 maps:intersect(M1, M2).
+Expression has type:   #{a => number()}
+Context expected type: #{a => 'true'}
+     │                                 
+
+Because in the expression's type:
+  #{ a =>
+    Here the type is:     number()
+    Context expects type: 'true'
+  , ... }
+
+------------------------------ Detailed message ------------------------------
+
+  #{a => number()} is not compatible with #{a => 'true'}
+  because
+  at key `a`:
+  #{a => number()} is not compatible with #{a => 'true'}
+  because
+  number() is not compatible with 'true'
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2596:33
+     │
+2596 │ maps_intersect_6_neg(M1, M2) -> maps:intersect(M1, M2).
+     │                                 ^^^^^^^^^^^^^^^^^^^^^^
+     │                                 │
+     │                                 maps:intersect(M1, M2).
+Expression has type:   #{a => number()}
+Context expected type: #{a := number()}
+     │                                 
+
+Because in the expression's type:
+  Here the type is:     #{a => ..., ...}
+  Context expects type: #{a := ..., ...}
+  The type of the expression is missing the following required keys: a.
+
+------------------------------ Detailed message ------------------------------
+
+key `a` is declared as required in the latter but not in the former
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2709:40
+     │
+2709 │             (foo, A) -> binary_to_atom(A);
+     │                                        ^ A.
+Expression has type:   atom()
+Context expected type: binary()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2710:40
+     │
+2710 │             (bar, B) -> atom_to_binary(B);
+     │                                        ^ B.
+Expression has type:   binary()
+Context expected type: atom()
+
+error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
+     ┌─ check/src/custom.erl:2711:50
+     │
+2711 │             ({foo, bar}, I) -> binary_to_integer(I);
+     │                                                  ^ I.
+Expression has type:   number()
+Context expected type: binary()
+
+202 ERRORS
diff --git a/crates/elp/src/resources/test/eqwalizer_tests/eqwater/eqwater_maps.pretty b/crates/elp/src/resources/test/eqwalizer_tests/eqwater/eqwater_maps.pretty
index b5f637ead3..037e6b14a6 100644
--- a/crates/elp/src/resources/test/eqwalizer_tests/eqwater/eqwater_maps.pretty
+++ b/crates/elp/src/resources/test/eqwalizer_tests/eqwater/eqwater_maps.pretty
@@ -70,20 +70,4 @@ error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types
 Expression has type:   #{a := dynamic(), dynamic() => dynamic()}
 Context expected type: 'err'
 
-error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
-   ┌─ eqwater/src/eqwater_maps.erl:70:29
-   │
-70 │     (_, #{a := V}) -> is_ok(V)
-   │                             ^
-   │                             │
-   │                             V.
-Expression has type:   'ok' | 'err'
-Context expected type: 'ok'
-   │                             
-
-Because in the expression's type:
-  Here the type is a union type with some valid candidates: 'ok'
-  However the following candidate: 'err'
-  Differs from the expected type:  'ok'
-
-6 ERRORS
+5 ERRORS
diff --git a/crates/elp/src/resources/test/hierarchical_config/basic.stdout b/crates/elp/src/resources/test/hierarchical_config/basic.stdout
index de8cb63308..b0ccc8796b 100644
--- a/crates/elp/src/resources/test/hierarchical_config/basic.stdout
+++ b/crates/elp/src/resources/test/hierarchical_config/basic.stdout
@@ -1,5 +1,6 @@
 Diagnostics reported:
 Reporting all diagnostics codes
+app_a/src/app_a.erl:4:9-4:16::[Warning] [W0002] Unused macro (MACRO_B)
 app_a/src/app_a.erl:6:1-6:5::[Warning] [L1230] function main/0 is unused
 app_b/src/app_b.erl:4:9-4:16::[Warning] [W0002] Unused macro (MACRO_B)
-app_b/src/app_b.erl:6:1-6:5::[Warning] [L1230] function main/0 is unused
+app_b/src/app_b.erl:6:1-6:5::[Warning] [L1230] function main/0 is unused
\ No newline at end of file
diff --git a/crates/elp/src/resources/test/linter/parse_elp_lint_ignore_apps_b.stdout b/crates/elp/src/resources/test/linter/parse_elp_lint_ignore_apps_b.stdout
index 5a42009118..3d59c453e3 100644
--- a/crates/elp/src/resources/test/linter/parse_elp_lint_ignore_apps_b.stdout
+++ b/crates/elp/src/resources/test/linter/parse_elp_lint_ignore_apps_b.stdout
@@ -1,3 +1,3 @@
 Diagnostics reported:
-app_a/src/app_a.erl:9:6-9:7::[Warning] [W0010] this variable is unused
 app_a/src/app_a_unused_param.erl:5:5-5:6::[Warning] [W0010] this variable is unused
+app_a/src/app_a.erl:9:6-9:7::[Warning] [W0010] this variable is unused
diff --git a/crates/elp/src/resources/test/linter/parse_elp_no_lint_specified_json_output.stdout b/crates/elp/src/resources/test/linter/parse_elp_no_lint_specified_json_output.stdout
index 7b6a1e705c..6e07ea2bba 100644
--- a/crates/elp/src/resources/test/linter/parse_elp_no_lint_specified_json_output.stdout
+++ b/crates/elp/src/resources/test/linter/parse_elp_no_lint_specified_json_output.stdout
@@ -5,8 +5,6 @@
 {"path":"app_a/src/app_a.erl","line":5,"char":5,"code":"ELP","severity":"warning","name":"W0011 (application_get_env)","original":null,"replacement":null,"description":"module `app_a` belongs to app `app_a`, but reads env for `misc`\n\nFor more information see: /erlang-error-index/w/W0011","docPath":"website/docs/erlang-error-index/w/W0011.md"}
 {"path":"app_a/src/app_a.erl","line":8,"char":7,"code":"ELP","severity":"warning","name":"W0018 (unexpected_semi_or_dot)","original":null,"replacement":null,"description":"Unexpected ';'\n\nFor more information see: /erlang-error-index/w/W0018","docPath":"website/docs/erlang-error-index/w/W0018.md"}
 {"path":"app_a/src/app_a.erl","line":9,"char":1,"code":"ELP","severity":"error","name":"P1700 (head_mismatch)","original":null,"replacement":null,"description":"head mismatch 'fooX' vs 'food'\n\nFor more information see: /erlang-error-index/p/P1700","docPath":null}
-{"path":"app_a/src/app_a_ssr.erl","line":7,"char":6,"code":"ELP","severity":"warning","name":"W0060 (bound_var_in_lhs)","original":null,"replacement":null,"description":"Match on a bound variable\n\nFor more information see: /erlang-error-index/w/W0060","docPath":"website/docs/erlang-error-index/w/W0060.md"}
-{"path":"app_a/src/app_a_ssr.erl","line":8,"char":6,"code":"ELP","severity":"warning","name":"W0060 (bound_var_in_lhs)","original":null,"replacement":null,"description":"Match on a bound variable\n\nFor more information see: /erlang-error-index/w/W0060","docPath":"website/docs/erlang-error-index/w/W0060.md"}
 {"path":"app_a/src/app_a_unused_param.erl","line":5,"char":5,"code":"ELP","severity":"warning","name":"L1268 (L1268)","original":null,"replacement":null,"description":"variable 'X' is unused\n\nFor more information see: /erlang-error-index/l/L1268","docPath":null}
 {"path":"app_a/src/custom_function_matches.erl","line":13,"char":5,"code":"ELP","severity":"warning","name":"W0017 (undefined_function)","original":null,"replacement":null,"description":"Function 'excluded:function/0' is undefined.\n\nFor more information see: /erlang-error-index/w/W0017","docPath":"website/docs/erlang-error-index/w/W0017.md"}
 {"path":"app_a/src/custom_function_matches.erl","line":14,"char":5,"code":"ELP","severity":"warning","name":"W0017 (undefined_function)","original":null,"replacement":null,"description":"Function 'not_excluded:function/0' is undefined.\n\nFor more information see: /erlang-error-index/w/W0017","docPath":"website/docs/erlang-error-index/w/W0017.md"}
diff --git a/crates/elp/src/resources/test/linter/parse_elp_no_lint_specified_output.stdout b/crates/elp/src/resources/test/linter/parse_elp_no_lint_specified_output.stdout
index 5bcd503e10..9f7a5405b4 100644
--- a/crates/elp/src/resources/test/linter/parse_elp_no_lint_specified_output.stdout
+++ b/crates/elp/src/resources/test/linter/parse_elp_no_lint_specified_output.stdout
@@ -8,8 +8,6 @@ app_a/src/app_a.erl:20:1-20:4::[Warning] [L1230] function bat/2 is unused
 app_a/src/app_a.erl:5:5-5:35::[Warning] [W0011] module `app_a` belongs to app `app_a`, but reads env for `misc`
 app_a/src/app_a.erl:8:7-8:8::[Warning] [W0018] Unexpected ';'
 app_a/src/app_a.erl:9:1-9:5::[Error] [P1700] head mismatch 'fooX' vs 'food'
-app_a/src/app_a_ssr.erl:7:6-7:7::[Warning] [W0060] Match on a bound variable
-app_a/src/app_a_ssr.erl:8:6-8:7::[Warning] [W0060] Match on a bound variable
 app_a/src/app_a_unused_param.erl:5:5-5:6::[Warning] [L1268] variable 'X' is unused
 app_a/src/custom_function_matches.erl:13:5-13:22::[Warning] [W0017] Function 'excluded:function/0' is undefined.
 app_a/src/custom_function_matches.erl:14:5-14:26::[Warning] [W0017] Function 'not_excluded:function/0' is undefined.
diff --git a/crates/elp/src/resources/test/linter/warnings_as_errors.stdout b/crates/elp/src/resources/test/linter/warnings_as_errors.stdout
index 01007e94c4..00d8506230 100644
--- a/crates/elp/src/resources/test/linter/warnings_as_errors.stdout
+++ b/crates/elp/src/resources/test/linter/warnings_as_errors.stdout
@@ -8,8 +8,6 @@ app_a/src/app_a.erl:20:1-20:4::[Error] [L1230] function bat/2 is unused
 app_a/src/app_a.erl:5:5-5:35::[Warning] [W0011] module `app_a` belongs to app `app_a`, but reads env for `misc`
 app_a/src/app_a.erl:8:7-8:8::[Warning] [W0018] Unexpected ';'
 app_a/src/app_a.erl:9:1-9:5::[Error] [P1700] head mismatch 'fooX' vs 'food'
-app_a/src/app_a_ssr.erl:7:6-7:7::[Warning] [W0060] Match on a bound variable
-app_a/src/app_a_ssr.erl:8:6-8:7::[Warning] [W0060] Match on a bound variable
 app_a/src/app_a_unused_param.erl:5:5-5:6::[Error] [L1268] variable 'X' is unused
 app_a/src/custom_function_matches.erl:13:5-13:22::[Warning] [W0017] Function 'excluded:function/0' is undefined.
 app_a/src/custom_function_matches.erl:14:5-14:26::[Warning] [W0017] Function 'not_excluded:function/0' is undefined.
diff --git a/crates/elp/src/resources/test/linter_config/basic.stdout b/crates/elp/src/resources/test/linter_config/basic.stdout
deleted file mode 100644
index 946fd7dc9a..0000000000
--- a/crates/elp/src/resources/test/linter_config/basic.stdout
+++ /dev/null
@@ -1,5 +0,0 @@
-Diagnostics reported:
-Reporting all diagnostics codes
-app_a/src/app_a.erl:3:9-3:16::[Warning] [W0002] Unused macro (MACRO_A)
-app_a/src/app_a.erl:4:9-4:14::[Warning] [L1260] record rec_a is unused
-app_b/src/app_b.erl:3:9-3:16::[Warning] [W0002] Unused macro (MACRO_B)
\ No newline at end of file
diff --git a/crates/elp/src/resources/test/parse_elp_help.stdout b/crates/elp/src/resources/test/parse_elp_help.stdout
index 75cc38354e..1457aed5c5 100644
--- a/crates/elp/src/resources/test/parse_elp_help.stdout
+++ b/crates/elp/src/resources/test/parse_elp_help.stdout
@@ -1,4 +1,4 @@
-Usage: [--project PROJECT] [--module MODULE] [--file ARG] [--to TO] [--no-diags] [--experimental] [--as PROFILE] [--dump-includes] [--rebar] [--include-generated] [--serial] [--use-cli-severity] [[--format FORMAT]] [--report-system-stats] [[--severity SEVERITY]]
+Usage: [--project PROJECT] [--module MODULE] [--file ARG] [--to TO] [--no-diags] [--experimental] [--as PROFILE] [--dump-includes] [--rebar] [--include-generated] [--serial] [--use-cli-severity] [[--format FORMAT]] [--report-system-stats]
 
 Available options:
         --project <PROJECT>    Path to directory with project, or to a JSON file (defaults to `.`)
@@ -15,5 +15,4 @@ Available options:
         --use-cli-severity     If specified, use the provided CLI severity mapping instead of the default one
         --format <FORMAT>      Show diagnostics in JSON format
         --report-system-stats  Report system memory usage and other statistics
-        --severity <SEVERITY>  Minimum severity level to report. Valid values: error, warning, weak_warning, information
     -h, --help                 Prints help information
diff --git a/crates/elp/src/resources/test/standard/eqwalize_all_bail_on_error_failure.pretty b/crates/elp/src/resources/test/standard/eqwalize_all_bail_on_error_failure.pretty
index 1d868bbbc6..bfbe45f508 100644
--- a/crates/elp/src/resources/test/standard/eqwalize_all_bail_on_error_failure.pretty
+++ b/crates/elp/src/resources/test/standard/eqwalize_all_bail_on_error_failure.pretty
@@ -192,14 +192,6 @@ error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types
 Expression has type:   'wrong_ret'
 Context expected type: 'error'
 
-error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
-  ┌─ app_a/test/app_a_test_helpers_not_opted_in.erl:5:11
-  │
-5 │ fail() -> error.
-  │           ^^^^^ 'error'.
-Expression has type:   'error'
-Context expected type: 'ok'
-
 error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
    ┌─ app_b/src/app_b.erl:16:5
    │
@@ -208,4 +200,4 @@ error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types
 Expression has type:   [T]
 Context expected type: T
 
-21 ERRORS
+20 ERRORS
diff --git a/crates/elp/src/resources/test/standard/eqwalize_all_diagnostics.jsonl b/crates/elp/src/resources/test/standard/eqwalize_all_diagnostics.jsonl
index b311705d68..8636389098 100644
--- a/crates/elp/src/resources/test/standard/eqwalize_all_diagnostics.jsonl
+++ b/crates/elp/src/resources/test/standard/eqwalize_all_diagnostics.jsonl
@@ -17,5 +17,4 @@
 {"path":"app_a/src/app_a_mod2.erl","line":22,"char":1,"code":"ELP","severity":"error","name":"eqWAlizer: type_alias_is_non_productive","original":null,"replacement":null,"description":"```lang=error,counterexample\n\nrecursive type invalid/0 is not productive\n```\n\n> [docs on `type_alias_is_non_productive`](https://fb.me/eqwalizer_errors#type_alias_is_non_productive)","docPath":null}
 {"path":"app_a/src/app_a_mod2.erl","line":31,"char":9,"code":"ELP","severity":"error","name":"eqWAlizer: incompatible_types","original":"'an_atom'","replacement":null,"description":"```lang=error,counterexample\n`'an_atom'`.\n\nExpression has type:   'an_atom'\nContext expected type: number()\n```\n\n> [docs on `incompatible_types`](https://fb.me/eqwalizer_errors#incompatible_types)","docPath":null}
 {"path":"app_a/test/app_a_test_helpers.erl","line":6,"char":11,"code":"ELP","severity":"error","name":"eqWAlizer: incompatible_types","original":"'wrong_ret'","replacement":null,"description":"```lang=error,counterexample\n`'wrong_ret'`.\n\nExpression has type:   'wrong_ret'\nContext expected type: 'error'\n```\n\n> [docs on `incompatible_types`](https://fb.me/eqwalizer_errors#incompatible_types)","docPath":null}
-{"path":"app_a/test/app_a_test_helpers_not_opted_in.erl","line":5,"char":11,"code":"ELP","severity":"error","name":"eqWAlizer: incompatible_types","original":"'error'","replacement":null,"description":"```lang=error,counterexample\n`'error'`.\n\nExpression has type:   'error'\nContext expected type: 'ok'\n```\n\n> [docs on `incompatible_types`](https://fb.me/eqwalizer_errors#incompatible_types)","docPath":null}
 {"path":"app_b/src/app_b.erl","line":16,"char":5,"code":"ELP","severity":"error","name":"eqWAlizer: incompatible_types","original":"L","replacement":null,"description":"```lang=error,counterexample\n`L`.\n\nExpression has type:   [T]\nContext expected type: T\n```\n\n> [docs on `incompatible_types`](https://fb.me/eqwalizer_errors#incompatible_types)","docPath":null}
diff --git a/crates/elp/src/resources/test/standard/eqwalize_all_diagnostics.pretty b/crates/elp/src/resources/test/standard/eqwalize_all_diagnostics.pretty
index 1d868bbbc6..bfbe45f508 100644
--- a/crates/elp/src/resources/test/standard/eqwalize_all_diagnostics.pretty
+++ b/crates/elp/src/resources/test/standard/eqwalize_all_diagnostics.pretty
@@ -192,14 +192,6 @@ error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types
 Expression has type:   'wrong_ret'
 Context expected type: 'error'
 
-error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
-  ┌─ app_a/test/app_a_test_helpers_not_opted_in.erl:5:11
-  │
-5 │ fail() -> error.
-  │           ^^^^^ 'error'.
-Expression has type:   'error'
-Context expected type: 'ok'
-
 error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
    ┌─ app_b/src/app_b.erl:16:5
    │
@@ -208,4 +200,4 @@ error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types
 Expression has type:   [T]
 Context expected type: T
 
-21 ERRORS
+20 ERRORS
diff --git a/crates/elp/src/resources/test/standard/eqwalize_all_diagnostics_gen.jsonl b/crates/elp/src/resources/test/standard/eqwalize_all_diagnostics_gen.jsonl
index b311705d68..8636389098 100644
--- a/crates/elp/src/resources/test/standard/eqwalize_all_diagnostics_gen.jsonl
+++ b/crates/elp/src/resources/test/standard/eqwalize_all_diagnostics_gen.jsonl
@@ -17,5 +17,4 @@
 {"path":"app_a/src/app_a_mod2.erl","line":22,"char":1,"code":"ELP","severity":"error","name":"eqWAlizer: type_alias_is_non_productive","original":null,"replacement":null,"description":"```lang=error,counterexample\n\nrecursive type invalid/0 is not productive\n```\n\n> [docs on `type_alias_is_non_productive`](https://fb.me/eqwalizer_errors#type_alias_is_non_productive)","docPath":null}
 {"path":"app_a/src/app_a_mod2.erl","line":31,"char":9,"code":"ELP","severity":"error","name":"eqWAlizer: incompatible_types","original":"'an_atom'","replacement":null,"description":"```lang=error,counterexample\n`'an_atom'`.\n\nExpression has type:   'an_atom'\nContext expected type: number()\n```\n\n> [docs on `incompatible_types`](https://fb.me/eqwalizer_errors#incompatible_types)","docPath":null}
 {"path":"app_a/test/app_a_test_helpers.erl","line":6,"char":11,"code":"ELP","severity":"error","name":"eqWAlizer: incompatible_types","original":"'wrong_ret'","replacement":null,"description":"```lang=error,counterexample\n`'wrong_ret'`.\n\nExpression has type:   'wrong_ret'\nContext expected type: 'error'\n```\n\n> [docs on `incompatible_types`](https://fb.me/eqwalizer_errors#incompatible_types)","docPath":null}
-{"path":"app_a/test/app_a_test_helpers_not_opted_in.erl","line":5,"char":11,"code":"ELP","severity":"error","name":"eqWAlizer: incompatible_types","original":"'error'","replacement":null,"description":"```lang=error,counterexample\n`'error'`.\n\nExpression has type:   'error'\nContext expected type: 'ok'\n```\n\n> [docs on `incompatible_types`](https://fb.me/eqwalizer_errors#incompatible_types)","docPath":null}
 {"path":"app_b/src/app_b.erl","line":16,"char":5,"code":"ELP","severity":"error","name":"eqWAlizer: incompatible_types","original":"L","replacement":null,"description":"```lang=error,counterexample\n`L`.\n\nExpression has type:   [T]\nContext expected type: T\n```\n\n> [docs on `incompatible_types`](https://fb.me/eqwalizer_errors#incompatible_types)","docPath":null}
diff --git a/crates/elp/src/resources/test/standard/eqwalize_app_diagnostics_gen_rebar.pretty b/crates/elp/src/resources/test/standard/eqwalize_app_diagnostics_gen_rebar.pretty
index 043aa00af0..67d78913b6 100644
--- a/crates/elp/src/resources/test/standard/eqwalize_app_diagnostics_gen_rebar.pretty
+++ b/crates/elp/src/resources/test/standard/eqwalize_app_diagnostics_gen_rebar.pretty
@@ -192,12 +192,4 @@ error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types
 Expression has type:   'wrong_ret'
 Context expected type: 'error'
 
-error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
-  ┌─ app_a/test/app_a_test_helpers_not_opted_in.erl:5:11
-  │
-5 │ fail() -> error.
-  │           ^^^^^ 'error'.
-Expression has type:   'error'
-Context expected type: 'ok'
-
-20 ERRORS
+19 ERRORS
diff --git a/crates/elp/src/resources/test/standard/eqwalize_app_diagnostics_rebar.pretty b/crates/elp/src/resources/test/standard/eqwalize_app_diagnostics_rebar.pretty
index 043aa00af0..67d78913b6 100644
--- a/crates/elp/src/resources/test/standard/eqwalize_app_diagnostics_rebar.pretty
+++ b/crates/elp/src/resources/test/standard/eqwalize_app_diagnostics_rebar.pretty
@@ -192,12 +192,4 @@ error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types
 Expression has type:   'wrong_ret'
 Context expected type: 'error'
 
-error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types)
-  ┌─ app_a/test/app_a_test_helpers_not_opted_in.erl:5:11
-  │
-5 │ fail() -> error.
-  │           ^^^^^ 'error'.
-Expression has type:   'error'
-Context expected type: 'ok'
-
-20 ERRORS
+19 ERRORS
diff --git a/crates/elp/src/resources/test/xref/unavailable_type.stdout b/crates/elp/src/resources/test/xref/unavailable_type.stdout
index 688be17de3..7064c359ff 100644
--- a/crates/elp/src/resources/test/xref/unavailable_type.stdout
+++ b/crates/elp/src/resources/test/xref/unavailable_type.stdout
@@ -1,5 +1,5 @@
 Reporting all diagnostics codes
 module specified: unavailable_type
 Diagnostics reported:
-app_a/src/unavailable_type.erl:10:43-10:58::[Warning] [W0059] The type 'app_c:my_type_c/0' is defined in application 'app_c', but the application is not a dependency of 'app_a' (defined in 'root//xref:app_a').
-app_a/src/unavailable_type.erl:6:16-6:31::[Warning] [W0059] The type 'app_c:my_type_c/0' is defined in application 'app_c', but the application is not a dependency of 'app_a' (defined in 'root//xref:app_a').
+app_a/src/unavailable_type.erl:10:43-10:58::[Warning] [W0059] The type 'app_c:my_type_c/0' is defined in application 'app_c', but the application is not a dependency of 'app_a' (defined in 'fbcode//whatsapp/elp/test_projects/xref:app_a').
+app_a/src/unavailable_type.erl:6:16-6:31::[Warning] [W0059] The type 'app_c:my_type_c/0' is defined in application 'app_c', but the application is not a dependency of 'app_a' (defined in 'fbcode//whatsapp/elp/test_projects/xref:app_a').
diff --git a/crates/elp/src/server.rs b/crates/elp/src/server.rs
index 98890640bc..65c75a1bbc 100644
--- a/crates/elp/src/server.rs
+++ b/crates/elp/src/server.rs
@@ -2073,7 +2073,7 @@ impl Server {
             };
 
             for (_, _, file_id) in module_index.iter_own() {
-                match snapshot.analysis.should_eqwalize(file_id) {
+                match snapshot.analysis.should_eqwalize(file_id, false) {
                     Ok(true) => {
                         files.push(file_id);
                     }
diff --git a/crates/elp/src/server/setup.rs b/crates/elp/src/server/setup.rs
index 4b8615e07c..8dba975e73 100644
--- a/crates/elp/src/server/setup.rs
+++ b/crates/elp/src/server/setup.rs
@@ -33,7 +33,7 @@ use super::FILE_WATCH_LOGGER_NAME;
 use super::logger::LspLogger;
 use crate::config::Config;
 use crate::from_json;
-// @fb-only: use crate::meta_only::get_log_dir;
+// @fb-only
 use crate::server::Handle;
 use crate::server::LOGGER_NAME;
 use crate::server::Server;
@@ -126,7 +126,7 @@ impl ServerSetup {
 
         // Set up a logger for tracking down why we are seeing stale
         // results when branches are switched, as per T218973130
-        // @fb-only: let log_dir = get_log_dir();
+        // @fb-only
         let log_dir = format!("{}/elp", std::env::temp_dir().display()); // @oss-only
         let _ = fs::create_dir_all(&log_dir);
         let log_file = format!(
diff --git a/crates/elp/src/snapshot.rs b/crates/elp/src/snapshot.rs
index 69ea6b97e0..e79251f73a 100644
--- a/crates/elp/src/snapshot.rs
+++ b/crates/elp/src/snapshot.rs
@@ -36,11 +36,9 @@ use parking_lot::Mutex;
 use parking_lot::RwLock;
 use serde::Deserialize;
 use serde::Serialize;
-use vfs::AnchoredPathBuf;
 
 use crate::config::Config;
 use crate::convert;
-use crate::convert::url_from_abs_path;
 use crate::line_endings::LineEndings;
 use crate::mem_docs::MemDocs;
 use crate::server::EqwalizerTypes;
@@ -188,14 +186,6 @@ impl Snapshot {
         self.line_ending_map.read()[&id]
     }
 
-    pub(crate) fn anchored_path(&self, path: &AnchoredPathBuf) -> Option<Url> {
-        let mut base = self.vfs.read().file_path(path.anchor).clone();
-        base.pop();
-        let path = base.join(&path.path)?;
-        let path = path.as_path()?;
-        Some(url_from_abs_path(path))
-    }
-
     pub fn update_cache_for_file(
         &self,
         file_id: FileId,
@@ -203,7 +193,7 @@ impl Snapshot {
     ) -> Result<()> {
         let _ = self.analysis.def_map(file_id)?;
         if optimize_for_eqwalizer {
-            let should_eqwalize = self.analysis.should_eqwalize(file_id)?;
+            let should_eqwalize = self.analysis.should_eqwalize(file_id, false)?;
             if should_eqwalize {
                 let _ = self.analysis.module_ast(file_id)?;
             }
@@ -252,7 +242,7 @@ impl Snapshot {
         let file_ids: Vec<FileId> = module_index
             .iter_own()
             .filter_map(|(_, _, file_id)| {
-                if let Ok(true) = self.analysis.should_eqwalize(file_id) {
+                if let Ok(true) = self.analysis.should_eqwalize(file_id, false) {
                     Some(file_id)
                 } else {
                     None
diff --git a/crates/elp/src/to_proto.rs b/crates/elp/src/to_proto.rs
index 3e5b1fd1e1..70d316d5c6 100644
--- a/crates/elp/src/to_proto.rs
+++ b/crates/elp/src/to_proto.rs
@@ -10,7 +10,6 @@
 
 //! Conversion of rust-analyzer specific types to lsp_types equivalents.
 
-use std::mem;
 use std::sync::atomic::AtomicU32;
 use std::sync::atomic::Ordering;
 
@@ -48,7 +47,6 @@ use elp_ide::elp_ide_db::elp_base_db::FileId;
 use elp_ide::elp_ide_db::elp_base_db::FilePosition;
 use elp_ide::elp_ide_db::elp_base_db::FileRange;
 use elp_ide::elp_ide_db::rename::RenameError;
-use elp_ide::elp_ide_db::source_change::FileSystemEdit;
 use elp_ide::elp_ide_db::source_change::SourceChange;
 use elp_ide_db::text_edit::Indel;
 use elp_ide_db::text_edit::TextEdit;
@@ -123,9 +121,9 @@ pub(crate) fn optional_versioned_text_document_identifier(
 pub(crate) fn text_document_edit(
     snap: &Snapshot,
     file_id: FileId,
-    text_document: lsp_types::OptionalVersionedTextDocumentIdentifier,
     edit: TextEdit,
 ) -> Result<lsp_types::TextDocumentEdit> {
+    let text_document = optional_versioned_text_document_identifier(snap, file_id);
     let line_index = snap.analysis.line_index(file_id)?;
     let line_endings = snap.line_endings(file_id);
     let edits: Vec<lsp_types::OneOf<lsp_types::TextEdit, lsp_types::AnnotatedTextEdit>> = edit
@@ -133,131 +131,34 @@ pub(crate) fn text_document_edit(
         .map(|it| lsp_types::OneOf::Left(text_edit(&line_index, line_endings, it)))
         .collect();
 
+    // if snap.analysis.is_library_file(file_id)? && snap.config.change_annotation_support() {
+    //     for edit in &mut edits {
+    //         edit.annotation_id = Some(outside_workspace_annotation_id())
+    //     }
+    // }
     Ok(lsp_types::TextDocumentEdit {
         text_document,
         edits,
     })
 }
 
-pub(crate) fn text_document_ops(
-    snap: &Snapshot,
-    file_system_edit: FileSystemEdit,
-) -> Cancellable<Vec<lsp_types::DocumentChangeOperation>> {
-    let mut ops = Vec::new();
-    match file_system_edit {
-        FileSystemEdit::CreateFile {
-            dst,
-            initial_contents,
-        } => {
-            if let Some(uri) = snap.anchored_path(&dst) {
-                let create_file = lsp_types::ResourceOp::Create(lsp_types::CreateFile {
-                    uri: uri.clone(),
-                    options: None,
-                    annotation_id: None,
-                });
-                ops.push(lsp_types::DocumentChangeOperation::Op(create_file));
-                if !initial_contents.is_empty() {
-                    let text_document =
-                        lsp_types::OptionalVersionedTextDocumentIdentifier { uri, version: None };
-                    let text_edit = lsp_types::TextEdit {
-                        range: lsp_types::Range::default(),
-                        new_text: initial_contents,
-                    };
-                    let edit_file = lsp_types::TextDocumentEdit {
-                        text_document,
-                        edits: vec![lsp_types::OneOf::Left(text_edit)],
-                    };
-                    ops.push(lsp_types::DocumentChangeOperation::Edit(edit_file));
-                }
-            } else {
-                log::warn!("create file failed: {:?}", dst);
-            }
-        }
-        FileSystemEdit::MoveFile { src, dst } => {
-            if let Some(new_uri) = snap.anchored_path(&dst) {
-                let old_uri = snap.file_id_to_url(src);
-                let rename_file = lsp_types::RenameFile {
-                    old_uri,
-                    new_uri,
-                    options: None,
-                    annotation_id: None,
-                };
-                ops.push(lsp_types::DocumentChangeOperation::Op(
-                    lsp_types::ResourceOp::Rename(rename_file),
-                ))
-            } else {
-                log::warn!("rename file failed: {:?} -> {:?}", src, dst);
-            }
-        }
-    }
-    Ok(ops)
-}
-
 pub(crate) fn workspace_edit(
     snap: &Snapshot,
-    mut source_change: SourceChange,
+    source_change: SourceChange,
 ) -> Result<lsp_types::WorkspaceEdit> {
-    let mut document_changes: Vec<lsp_types::DocumentChangeOperation> = Vec::new();
-
-    // This is copying RA's order of operations, first file creates,
-    // then edits, then file moves.
-
-    // This allows us to apply edits to the file once it has
-    // moved. Except we have no FileId at that point
-    for op in &mut source_change.file_system_edits {
-        if let FileSystemEdit::CreateFile {
-            dst,
-            initial_contents,
-        } = op
-        {
-            // replace with a placeholder to avoid cloning the edit
-            let op = FileSystemEdit::CreateFile {
-                dst: dst.clone(),
-                initial_contents: mem::take(initial_contents),
-            };
-            let ops = text_document_ops(snap, op)?;
-            document_changes.extend_from_slice(&ops);
-        }
-    }
-
-    for op in source_change.file_system_edits {
-        if !matches!(op, FileSystemEdit::CreateFile { .. }) {
-            let ops = text_document_ops(snap, op)?;
-            document_changes.extend_from_slice(&ops);
-        }
-    }
-
+    let mut edits: Vec<_> = vec![];
     for (file_id, edit) in source_change.source_file_edits {
-        let text_document = optional_versioned_text_document_identifier(snap, file_id);
-        let edit = text_document_edit(snap, file_id, text_document, edit)?;
-        document_changes.push(lsp_types::DocumentChangeOperation::Edit(
-            lsp_types::TextDocumentEdit {
-                text_document: edit.text_document,
-                edits: edit.edits.into_iter().collect(),
-            },
-        ));
+        // let edit = snippet_text_document_edit(snap, source_change.is_snippet, file_id, edit)?;
+        let edit = text_document_edit(snap, file_id, edit)?;
+        edits.push(lsp_types::TextDocumentEdit {
+            text_document: edit.text_document,
+            edits: edit.edits.into_iter().collect(),
+        });
     }
-
-    // Edits on renamed files.  The LineIndex from the original can be used.
-    for (file_ref, edit) in source_change.new_file_edits {
-        if let Some(uri) = snap.anchored_path(&file_ref.clone().into()) {
-            let version = snap.url_file_version(&uri);
-            let text_document = lsp_types::OptionalVersionedTextDocumentIdentifier { uri, version };
-            let edit = text_document_edit(snap, file_ref.anchor, text_document, edit)?;
-            document_changes.push(lsp_types::DocumentChangeOperation::Edit(
-                lsp_types::TextDocumentEdit {
-                    text_document: edit.text_document,
-                    edits: edit.edits.into_iter().collect(),
-                },
-            ));
-        } else {
-            log::warn!("new file edit failed: {:?}", file_ref);
-        }
-    }
-
+    let document_changes = lsp_types::DocumentChanges::Edits(edits);
     let workspace_edit = lsp_types::WorkspaceEdit {
         changes: None,
-        document_changes: Some(lsp_types::DocumentChanges::Operations(document_changes)),
+        document_changes: Some(document_changes),
         change_annotations: None,
     };
     Ok(workspace_edit)
@@ -281,6 +182,10 @@ pub(crate) fn code_action(
 ) -> Result<lsp_types::CodeActionOrCommand> {
     let mut res = lsp_types::CodeAction {
         title: assist.label.to_string(),
+        // group: assist
+        //     .group
+        //     .filter(|_| snap.config.code_action_group())
+        //     .map(|gr| gr.0),
         kind: Some(code_action_kind(assist.id.1)),
         edit: None,
         is_preferred: None,
diff --git a/crates/elp/tests/slow-tests/buck_tests.rs b/crates/elp/tests/slow-tests/buck_tests.rs
index 91f2b234d9..e76fdb8bad 100644
--- a/crates/elp/tests/slow-tests/buck_tests.rs
+++ b/crates/elp/tests/slow-tests/buck_tests.rs
@@ -31,7 +31,7 @@ mod tests {
     #[test]
     #[ignore]
     fn test_success_case() {
-        let path_str = "../../test/test_projects/buck_tests";
+        let path_str = "../../test_projects/buck_tests";
         let path: PathBuf = path_str.into();
         let cli = Fake::default();
 
@@ -65,7 +65,7 @@ mod tests {
             let ast = analysis.module_ast(file_id).unwrap();
             assert_eq!(ast.errors, vec![]);
             let eq_enabled = analysis
-                .is_eqwalizer_enabled(file_id)
+                .is_eqwalizer_enabled(file_id, false)
                 .unwrap_or_else(|_| panic!("Failed to check if eqwalizer enabled for {module}"));
             assert_eq!(eq_enabled, eqwalizer_enabled);
             let project_data = analysis.project_data(file_id).unwrap();
@@ -76,7 +76,7 @@ mod tests {
     #[test]
     #[ignore]
     fn test_load_buck_targets() {
-        let path_str = "../../test/test_projects/buck_tests";
+        let path_str = "../../test_projects/buck_tests";
         let path: PathBuf = path_str.into();
 
         let (elp_config, buck_config) =
diff --git a/crates/elp/tests/slow-tests/main.rs b/crates/elp/tests/slow-tests/main.rs
index e256ce2c62..60167593fd 100644
--- a/crates/elp/tests/slow-tests/main.rs
+++ b/crates/elp/tests/slow-tests/main.rs
@@ -36,7 +36,7 @@ use crate::support::diagnostic_project;
 fn test_run_mock_lsp() {
     if cfg!(feature = "buck") {
         let workspace_root = AbsPathBuf::assert(
-            Utf8Path::new(env!("CARGO_WORKSPACE_DIR")).join("test/test_projects/end_to_end"),
+            Utf8Path::new(env!("CARGO_WORKSPACE_DIR")).join("test_projects/end_to_end"),
         );
 
         // Sanity check
@@ -70,7 +70,7 @@ fn test_run_mock_lsp() {
                             }
                           ],
                           "textDocument": {
-                            "uri": "file:///[..]/test/test_projects/end_to_end/assist_examples/src/head_mismatch.erl",
+                            "uri": "file:///[..]/test_projects/end_to_end/assist_examples/src/head_mismatch.erl",
                             "version": 0
                           }
                         }
@@ -99,7 +99,7 @@ fn test_run_mock_lsp() {
                             }
                           ],
                           "textDocument": {
-                            "uri": "file:///[..]/test/test_projects/end_to_end/assist_examples/src/head_mismatch.erl",
+                            "uri": "file:///[..]/test_projects/end_to_end/assist_examples/src/head_mismatch.erl",
                             "version": 0
                           }
                         }
@@ -128,7 +128,7 @@ fn test_run_mock_lsp() {
                             }
                           ],
                           "textDocument": {
-                            "uri": "file:///[..]/test/test_projects/end_to_end/assist_examples/src/head_mismatch.erl",
+                            "uri": "file:///[..]/test_projects/end_to_end/assist_examples/src/head_mismatch.erl",
                             "version": 0
                           }
                         }
@@ -157,7 +157,7 @@ fn test_run_mock_lsp() {
                             }
                           ],
                           "textDocument": {
-                            "uri": "file:///[..]/test/test_projects/end_to_end/assist_examples/src/head_mismatch.erl",
+                            "uri": "file:///[..]/test_projects/end_to_end/assist_examples/src/head_mismatch.erl",
                             "version": 0
                           }
                         }
@@ -175,7 +175,7 @@ fn test_run_mock_lsp() {
 fn test_e2e_eqwalizer_module() {
     if cfg!(feature = "buck") {
         let workspace_root = AbsPathBuf::assert(
-            Utf8Path::new(env!("CARGO_WORKSPACE_DIR")).join("test/test_projects/standard"),
+            Utf8Path::new(env!("CARGO_WORKSPACE_DIR")).join("test_projects/standard"),
         );
 
         // Sanity check
@@ -321,7 +321,7 @@ fn test_e2e_eqwalizer_module() {
                       "source": "eqWAlizer"
                     }
                   ],
-                  "uri": "file:///[..]/test/test_projects/standard/app_a/src/app_a.erl",
+                  "uri": "file:///[..]/test_projects/standard/app_a/src/app_a.erl",
                   "version": 0
                 }"#]],
         );
@@ -334,7 +334,7 @@ fn test_e2e_eqwalizer_module() {
 // #[test]
 // fn test_e2e_eqwalizer_header() {
 //     let workspace_root =
-//         AbsPathBuf::assert(Path::new(env!("CARGO_WORKSPACE_DIR")).join("test/test_projects/standard"));
+//         AbsPathBuf::assert(Path::new(env!("CARGO_WORKSPACE_DIR")).join("test_projects/standard"));
 
 //     // Sanity check
 //     assert!(std::fs::metadata(&workspace_root).is_ok());
diff --git a/crates/hir/src/body/scope.rs b/crates/hir/src/body/scope.rs
index 4ac4e366d8..dd1da23e94 100644
--- a/crates/hir/src/body/scope.rs
+++ b/crates/hir/src/body/scope.rs
@@ -865,7 +865,7 @@ mod tests {
             f() ->
               As = [1,2,3],
               Bs = [4,5,6],
-              [{X,Y, ~} || X <- As && Y <- Bs]
+              [{X,Y}~ || X <- As && Y <- Bs]
               .
             ",
             &["Y", "X", "As", "Bs"],
diff --git a/crates/hir/src/body/tests.rs b/crates/hir/src/body/tests.rs
index eab603a76d..c616df812d 100644
--- a/crates/hir/src/body/tests.rs
+++ b/crates/hir/src/body/tests.rs
@@ -448,7 +448,6 @@ foo(#record.field) -> #record.field.
 fn record() {
     check(
         r#"
-//- expect_parse_errors
 foo1(#record{field = 1}) -> #record{field = A + B}.
 foo2(#record{field}) -> #record{field = }.
 "#,
@@ -474,7 +473,6 @@ foo2(#record{field}) -> #record{field = }.
 fn record_update() {
     check(
         r#"
-//- expect_parse_errors
 foo1() -> Expr#record{field = undefined}.
 foo2() -> Expr#record{field = ok, missing = }.
 "#,
@@ -559,7 +557,7 @@ fn case() {
         r#"
 foo() ->
     case 1 + 2 of
-        X when X andalso true; X =< 100, X >= 5 -> ok;
+        X when X andalso true; X <= 100, X >= 5 -> ok;
         _ -> error
     end.
 "#,
@@ -568,7 +566,7 @@ foo() ->
                 case (1 + 2) of
                     X when
                         (X andalso true);
-                        (X =< 100),
+                        (X < 100),
                         (X >= 5)
                     ->
                         ok;
@@ -838,7 +836,6 @@ foo() ->
 fn parens() {
     check(
         r#"
-//- expect_parse_errors
 foo((ok), ()) ->
     (ok),
     ().
@@ -998,7 +995,6 @@ foo(fun() -> ok end) -> ok.
 fn invalid_comprehension() {
     check(
         r#"
-//- expect_parse_errors
 foo(<<Byte || Byte <- List>>, [Byte || Byte <- List]]) -> ok.
 "#,
         expect![[r#"
@@ -1396,7 +1392,6 @@ fn call_type_erlang_bif() {
 fn record_type() {
     check(
         r#"
-//- expect_parse_errors
 -type foo1() :: #record{}.
 -type foo2(B) :: #record{a :: integer(), b :: B}.
 -type foo3() :: #record{a ::}.
@@ -1534,7 +1529,6 @@ fn record_definition() {
 fn simple_term() {
     check(
         r#"
-//- expect_parse_errors
 -foo(ok).
 -missing_value().
 "#,
@@ -2699,7 +2693,6 @@ fn verbatim_binary_sigil_in_type() {
     // Note: \~ gets replaced by ~ in the fixture parsing
     check(
         r#"
-        //- expect_parse_errors
         -type foo() :: \~B"ab\"c\"\d").
         -type bar() :: "hello").
         "#,
@@ -2730,7 +2723,6 @@ fn verbatim_binary_sigil_in_term() {
 fn lowering_with_error_nodes() {
     check(
         r#"
-         //- expect_parse_errors
             f(1a) -> ok begin 1 end.
         "#,
         expect![[r#"
@@ -2997,10 +2989,8 @@ fn tree_print_record() {
 
 #[test]
 fn tree_print_attribute() {
-    // TODO: fix wild attribute parsing, T246546041, to remove expect_parse_errors
     check_ast(
         r#"
-        //- expect_parse_errors
          -wild(foo, []).
          -compile({inline, [foo/1]}).
          -compile({a/a, 1/1}).
diff --git a/crates/hir/src/body/tree_print.rs b/crates/hir/src/body/tree_print.rs
index d6b956690f..4aa6591d84 100644
--- a/crates/hir/src/body/tree_print.rs
+++ b/crates/hir/src/body/tree_print.rs
@@ -2340,7 +2340,7 @@ mod tests {
             r#"
              foo() ->
                  case 1 + 2 of
-                     X when X andalso true; X =< 100, X >= 5 -> ok;
+                     X when X andalso true; X <= 100, X >= 5 -> ok;
                      _ -> error
                  end.
             "#,
@@ -2381,7 +2381,7 @@ mod tests {
                                                 rhs
                                                     Expr<8>:Literal(Integer(100))
                                                 op
-                                                    CompOp(Ord { ordering: Less, strict: false }),
+                                                    CompOp(Ord { ordering: Less, strict: true }),
                                             },
                                             Expr<12>:Expr::BinaryOp {
                                                 lhs
@@ -3114,7 +3114,6 @@ mod tests {
     fn type_record() {
         check(
             r#"
-            //- expect_parse_errors
             -type foo1() :: #record{}.
             -type foo2(B) :: #record{a :: integer(), b :: B}.
             -type foo3() :: #record{a ::}.
@@ -3499,7 +3498,6 @@ mod tests {
     fn top_level_forms() {
         check(
             r#"
-            //- expect_parse_errors
              -module(main).
              bug
              -compile([export_all]).
diff --git a/crates/hir/src/fold.rs b/crates/hir/src/fold.rs
index 59b12be6fd..78cd442592 100644
--- a/crates/hir/src/fold.rs
+++ b/crates/hir/src/fold.rs
@@ -339,7 +339,7 @@ pub enum ParentId {
 
 #[derive(Debug)]
 pub struct AnyCallBackCtx<'a> {
-    pub in_macro: Option<(HirIdx, Option<InFile<DefineId>>)>,
+    pub in_macro: Option<HirIdx>,
     pub parents: &'a Vec<ParentId>,
     pub item_id: AnyExprId,
     pub item: AnyExpr,
@@ -426,7 +426,7 @@ pub struct FoldCtx<'a, T> {
     body_origin: BodyOrigin,
     body: &'a FoldBody<'a>,
     strategy: Strategy,
-    macro_stack: Vec<(HirIdx, Option<InFile<DefineId>>)>,
+    macro_stack: Vec<HirIdx>,
     parents: Vec<ParentId>,
     callback: AnyCallBack<'a, T>,
 }
@@ -594,7 +594,7 @@ impl<'a, T> FoldCtx<'a, T> {
             .do_fold_pat(pat_id, initial)
     }
 
-    fn in_macro(&self) -> Option<(HirIdx, Option<InFile<DefineId>>)> {
+    fn in_macro(&self) -> Option<HirIdx> {
         self.macro_stack.first().copied()
     }
 
@@ -752,19 +752,16 @@ impl<'a, T> FoldCtx<'a, T> {
             crate::Expr::MacroCall {
                 expansion,
                 args,
-                macro_def,
+                macro_def: _,
                 macro_name: _,
             } => {
                 if self.strategy.macros == MacroStrategy::DoNotExpand {
                     self.do_fold_exprs(args, acc)
                 } else {
-                    self.macro_stack.push((
-                        HirIdx {
-                            body_origin: self.body_origin,
-                            idx: AnyExprId::Expr(expr_id),
-                        },
-                        *macro_def,
-                    ));
+                    self.macro_stack.push(HirIdx {
+                        body_origin: self.body_origin,
+                        idx: AnyExprId::Expr(expr_id),
+                    });
                     let e = self.do_fold_expr(*expansion, acc);
                     self.macro_stack.pop();
                     e
@@ -953,19 +950,16 @@ impl<'a, T> FoldCtx<'a, T> {
             crate::Pat::MacroCall {
                 expansion,
                 args,
-                macro_def,
+                macro_def: _,
                 macro_name: _,
             } => {
                 if self.strategy.macros == MacroStrategy::DoNotExpand {
                     self.do_fold_exprs(args, acc)
                 } else {
-                    self.macro_stack.push((
-                        HirIdx {
-                            body_origin: self.body_origin,
-                            idx: AnyExprId::Pat(pat_id),
-                        },
-                        *macro_def,
-                    ));
+                    self.macro_stack.push(HirIdx {
+                        body_origin: self.body_origin,
+                        idx: AnyExprId::Pat(pat_id),
+                    });
                     let e = self.do_fold_pat(*expansion, acc);
                     self.macro_stack.pop();
                     e
@@ -1171,19 +1165,16 @@ impl<'a, T> FoldCtx<'a, T> {
             TypeExpr::MacroCall {
                 expansion,
                 args,
-                macro_def,
+                macro_def: _,
                 macro_name: _,
             } => {
                 if self.strategy.macros == MacroStrategy::DoNotExpand {
                     self.do_fold_exprs(args, acc)
                 } else {
-                    self.macro_stack.push((
-                        HirIdx {
-                            body_origin: self.body_origin,
-                            idx: AnyExprId::TypeExpr(type_expr_id),
-                        },
-                        *macro_def,
-                    ));
+                    self.macro_stack.push(HirIdx {
+                        body_origin: self.body_origin,
+                        idx: AnyExprId::TypeExpr(type_expr_id),
+                    });
                     let e = self.do_fold_type_expr(*expansion, acc);
                     self.macro_stack.pop();
                     e
@@ -2221,9 +2212,7 @@ bar() ->
 
     #[test]
     fn traverse_attribute() {
-        // TODO: fix wild attribute parsing, T246546041, to remove expect_parse_errors
         let fixture_str = r#"
-               //- expect_parse_errors
                -module(foo).
                -wild(r1, {f1, f~oo}).
                "#;
diff --git a/crates/hir/src/form_list/tests.rs b/crates/hir/src/form_list/tests.rs
index 79f542fd0d..00a5ec4020 100644
--- a/crates/hir/src/form_list/tests.rs
+++ b/crates/hir/src/form_list/tests.rs
@@ -318,7 +318,6 @@ fn export() {
 fn import() {
     check(
         r#"
-//- expect_parse_errors
 -import(, []).
 -import(foo, []).
 -import(foo, [foo/1]).
diff --git a/crates/hir/src/lib.rs b/crates/hir/src/lib.rs
index 751a2f4907..1ec75fd25e 100644
--- a/crates/hir/src/lib.rs
+++ b/crates/hir/src/lib.rs
@@ -155,7 +155,7 @@ pub use name::MacroName;
 pub use name::Name;
 pub use name::NameArity;
 pub use name::known;
-// @fb-only: pub use name::meta_only;
+// @fb-only
 pub use sema::AtomDef;
 pub use sema::CallDef;
 pub use sema::DefinitionOrReference;
@@ -232,10 +232,6 @@ impl HirIdx {
         }
     }
 
-    pub fn file_id(&self) -> FileId {
-        self.body_origin.file_id()
-    }
-
     /// This function is used to print a representation of the HIR AST
     /// corresponding to the given `HirIdx`.  It is used for debugging
     /// and testing.
diff --git a/crates/hir/src/name.rs b/crates/hir/src/name.rs
index f94f139d38..00ce2f89f1 100644
--- a/crates/hir/src/name.rs
+++ b/crates/hir/src/name.rs
@@ -10,7 +10,7 @@
 
 //! See [`Name`].
 
-// @fb-only: pub mod meta_only;
+// @fb-only
 
 use std::borrow::Cow;
 use std::collections::HashSet;
diff --git a/crates/hir/src/sema.rs b/crates/hir/src/sema.rs
index 68577d2a2e..78a7db7c3c 100644
--- a/crates/hir/src/sema.rs
+++ b/crates/hir/src/sema.rs
@@ -102,7 +102,7 @@ use crate::resolver::Resolution;
 use crate::resolver::Resolver;
 
 mod find;
-// @fb-only: pub mod meta_only;
+// @fb-only
 pub mod to_def;
 
 pub struct ModuleIter(Arc<ModuleIndex>);
@@ -1006,28 +1006,6 @@ impl Semantic<'_> {
     // Folds end
     // -----------------------------------------------------------------
 
-    pub fn bound_vars_by_function(
-        &self,
-        file_id: FileId,
-    ) -> FxHashMap<FunctionClauseId, FxHashSet<PatId>> {
-        let bound_vars = self.bound_vars_in_pattern_diagnostic(file_id);
-        let mut bound_vars_by_function: FxHashMap<FunctionClauseId, FxHashSet<PatId>> =
-            FxHashMap::default();
-        bound_vars.iter().for_each(|(function_id, pat_id, _var)| {
-            bound_vars_by_function
-                .entry(function_id.value)
-                .and_modify(|vars| {
-                    vars.insert(*pat_id);
-                })
-                .or_insert_with(|| {
-                    let mut vars = FxHashSet::default();
-                    vars.insert(*pat_id);
-                    vars
-                });
-        });
-        bound_vars_by_function
-    }
-
     pub fn bound_vars_in_pattern_diagnostic(
         &self,
         file_id: FileId,
diff --git a/crates/hir/src/sema/to_def.rs b/crates/hir/src/sema/to_def.rs
index 01d17278a2..5918054fc5 100644
--- a/crates/hir/src/sema/to_def.rs
+++ b/crates/hir/src/sema/to_def.rs
@@ -42,7 +42,7 @@ use crate::macro_exp;
 use crate::macro_exp::BuiltInMacro;
 use crate::macro_exp::MacroExpCtx;
 use crate::resolver::Resolver;
-// @fb-only: use crate::sema::meta_only;
+// @fb-only
 
 pub trait ToDef: Clone {
     type Def;
@@ -567,7 +567,7 @@ pub fn resolve_call_target(
             let fn_name: Name = sema.db.lookup_atom(body[*name].as_atom()?);
             let mo =
                 None; // @oss-only
-                // @fb-only: meta_only::resolve_handle_call_target(sema, arity, file_id, &module_name, &fn_name);
+                // @fb-only
             if let Some(r) = mo {
                 r
             } else {
@@ -885,183 +885,12 @@ fn add_dynamic_call_patterns(patterns: &mut FxHashMap<PatternKey, DynamicCallPat
     );
 }
 
-/// Specifies what forms a module argument can take.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum ModuleArgType {
-    /// The argument must be a single module atom (e.g., `apply(Mod, Fun, Args)`)
-    Atom,
-    /// The argument must be a list of module atoms (e.g., some batch operations)
-    List,
-    /// The argument can be either a single module atom or a list of modules
-    /// (e.g., `meck:new(Mod | [Mod], Opts)`)
-    AtomOrList,
-}
-
-/// Pattern for matching module argument positions in function calls.
-/// Used by rename operations to identify which argument contains a module name.
-#[derive(Debug, Clone, Copy)]
-pub struct ModuleArgPattern {
-    /// Index of the argument containing the module name (0-based)
-    pub index: usize,
-    /// The type of the module argument (atom, list, or either)
-    pub arg_type: ModuleArgType,
-}
-
-impl ModuleArgPattern {
-    /// Creates a pattern where the argument is a single module atom.
-    pub const fn atom(index: usize) -> Self {
-        Self {
-            index,
-            arg_type: ModuleArgType::Atom,
-        }
-    }
-
-    /// Creates a pattern where the argument is a list of module atoms.
-    pub const fn list(index: usize) -> Self {
-        Self {
-            index,
-            arg_type: ModuleArgType::List,
-        }
-    }
-
-    /// Creates a pattern where the argument can be either a single atom or a list.
-    pub const fn atom_or_list(index: usize) -> Self {
-        Self {
-            index,
-            arg_type: ModuleArgType::AtomOrList,
-        }
-    }
-
-    /// Returns true if this pattern accepts a single atom.
-    pub const fn accepts_atom(&self) -> bool {
-        matches!(
-            self.arg_type,
-            ModuleArgType::Atom | ModuleArgType::AtomOrList
-        )
-    }
-
-    /// Returns true if this pattern accepts a list of atoms.
-    pub const fn accepts_list(&self) -> bool {
-        matches!(
-            self.arg_type,
-            ModuleArgType::List | ModuleArgType::AtomOrList
-        )
-    }
-}
-
-fn add_module_argument_patterns(patterns: &mut FxHashMap<PatternKey, ModuleArgPattern>) {
-    // Each entry follows the format:
-    // (module, function, arity) -> ModuleArgPattern
-    //
-    // Where:
-    // module:           Module name (Some("meck"), Some("application"), etc.)
-    // function:         Function name as string literal (e.g., "new", "get_env")
-    // arity:            Number of arguments this function pattern expects
-    // ModuleArgPattern: Contains the argument index and the expected type
-    //
-    // All indexes are 0-based.
-
-    // meck - mocking library
-    // meck:new/2 accepts either a single module atom or a list of modules
-    patterns.insert((Some("meck"), "called", 3), ModuleArgPattern::atom(0));
-    patterns.insert((Some("meck"), "called", 4), ModuleArgPattern::atom(0));
-    patterns.insert((Some("meck"), "capture", 5), ModuleArgPattern::atom(1));
-    patterns.insert((Some("meck"), "capture", 6), ModuleArgPattern::atom(1));
-    patterns.insert(
-        (Some("meck"), "delete", 3),
-        ModuleArgPattern::atom_or_list(0),
-    );
-    patterns.insert(
-        (Some("meck"), "delete", 4),
-        ModuleArgPattern::atom_or_list(0),
-    );
-    patterns.insert(
-        (Some("meck"), "expect", 3),
-        ModuleArgPattern::atom_or_list(0),
-    );
-    patterns.insert(
-        (Some("meck"), "expect", 4),
-        ModuleArgPattern::atom_or_list(0),
-    );
-    patterns.insert(
-        (Some("meck"), "expects", 2),
-        ModuleArgPattern::atom_or_list(0),
-    );
-    patterns.insert((Some("meck"), "history", 1), ModuleArgPattern::atom(0));
-    patterns.insert((Some("meck"), "history", 2), ModuleArgPattern::atom(0));
-    patterns.insert((Some("meck"), "loop", 4), ModuleArgPattern::atom_or_list(0));
-    patterns.insert((Some("meck"), "new", 1), ModuleArgPattern::atom_or_list(0));
-    patterns.insert((Some("meck"), "new", 2), ModuleArgPattern::atom_or_list(0));
-    patterns.insert((Some("meck"), "num_calls", 3), ModuleArgPattern::atom(0));
-    patterns.insert((Some("meck"), "num_calls", 4), ModuleArgPattern::atom(0));
-    patterns.insert(
-        (Some("meck"), "reset", 1),
-        ModuleArgPattern::atom_or_list(0),
-    );
-    patterns.insert(
-        (Some("meck"), "sequence", 4),
-        ModuleArgPattern::atom_or_list(0),
-    );
-    patterns.insert(
-        (Some("meck"), "unload", 1),
-        ModuleArgPattern::atom_or_list(0),
-    );
-    patterns.insert(
-        (Some("meck"), "validate", 1),
-        ModuleArgPattern::atom_or_list(0),
-    );
-    patterns.insert((Some("meck"), "wait", 4), ModuleArgPattern::atom(0));
-    patterns.insert((Some("meck"), "wait", 5), ModuleArgPattern::atom(1));
-    patterns.insert((Some("meck"), "wait", 6), ModuleArgPattern::atom(1));
-
-    // code module - module loading and management
-    // These functions from the Erlang stdlib take module() as their argument
-    patterns.insert((Some("code"), "load_file", 1), ModuleArgPattern::atom(0));
-    patterns.insert(
-        (Some("code"), "ensure_loaded", 1),
-        ModuleArgPattern::atom(0),
-    );
-    patterns.insert((Some("code"), "delete", 1), ModuleArgPattern::atom(0));
-    patterns.insert((Some("code"), "purge", 1), ModuleArgPattern::atom(0));
-    patterns.insert((Some("code"), "soft_purge", 1), ModuleArgPattern::atom(0));
-    patterns.insert((Some("code"), "is_loaded", 1), ModuleArgPattern::atom(0));
-    patterns.insert(
-        (Some("code"), "get_object_code", 1),
-        ModuleArgPattern::atom(0),
-    );
-    patterns.insert((Some("code"), "module_md5", 1), ModuleArgPattern::atom(0));
-    patterns.insert((Some("code"), "is_sticky", 1), ModuleArgPattern::atom(0));
-}
-
-// Lazy static initialization for the patterns maps
+// Lazy static initialization for the patterns map
 lazy_static! {
     static ref DYNAMIC_CALL_PATTERNS: FxHashMap<PatternKey, DynamicCallPattern> = {
         let mut patterns = FxHashMap::default();
         add_dynamic_call_patterns(&mut patterns);
-        // @fb-only: meta_only::add_dynamic_call_patterns(&mut patterns);
-        patterns
-    };
-    static ref MODULE_ARGUMENT_PATTERNS: FxHashMap<PatternKey, ModuleArgPattern> = {
-        let mut patterns = FxHashMap::default();
-        add_module_argument_patterns(&mut patterns);
-        // @fb-only: meta_only::add_module_argument_patterns(&mut patterns);
-        patterns
-    };
-    /// Combined patterns for module argument positions.
-    /// Merges dynamic call patterns (that have module_arg_index) with simple module argument patterns.
-    /// Used by rename operations where we only care about the module argument position.
-    static ref COMBINED_MODULE_ARG_PATTERNS: FxHashMap<PatternKey, ModuleArgPattern> = {
-        let mut patterns: FxHashMap<PatternKey, ModuleArgPattern> = FxHashMap::default();
-        // Add module_arg_index from dynamic call patterns (where present)
-        for (key, pattern) in DYNAMIC_CALL_PATTERNS.iter() {
-            if let Some(module_idx) = pattern.module_arg_index {
-                patterns.insert(*key, ModuleArgPattern::atom(module_idx));
-            }
-        }
-        // Add from simple module argument patterns
-        for (key, module_arg_pattern) in MODULE_ARGUMENT_PATTERNS.iter() {
-            patterns.insert(*key, *module_arg_pattern);
-        }
+        // @fb-only
         patterns
     };
 }
@@ -1070,10 +899,6 @@ fn get_dynamic_call_patterns() -> &'static FxHashMap<PatternKey, DynamicCallPatt
     &DYNAMIC_CALL_PATTERNS
 }
 
-pub fn get_module_arg_patterns() -> &'static FxHashMap<PatternKey, ModuleArgPattern> {
-    &COMBINED_MODULE_ARG_PATTERNS
-}
-
 fn look_for_dynamic_call(
     sema: &Semantic,
     file_id: FileId,
diff --git a/crates/ide/src/annotations.rs b/crates/ide/src/annotations.rs
index d0ae18c158..6cbdd3469c 100644
--- a/crates/ide/src/annotations.rs
+++ b/crates/ide/src/annotations.rs
@@ -17,7 +17,7 @@ use elp_syntax::TextRange;
 use fxhash::FxHashMap;
 use fxhash::FxHashSet;
 
-// @fb-only: use crate::meta_only;
+// @fb-only
 use crate::runnables::Runnable;
 use crate::runnables::runnables;
 
@@ -57,11 +57,11 @@ pub struct Link {
 }
 
 #[rustfmt::skip]
-// @fb-only: pub(crate) fn annotations(db: &RootDatabase, file_id: FileId) -> Vec<Annotation> {
+// @fb-only
 pub(crate) fn annotations(_db: &RootDatabase, _file_id: FileId) -> Vec<Annotation> { // @oss-only
-    // @fb-only: let mut annotations = Vec::default();
+    // @fb-only
     let annotations = Vec::default(); // @oss-only
-    // @fb-only: meta_only::annotations(db, file_id, &mut annotations);
+    // @fb-only
     annotations
 }
 
diff --git a/crates/ide/src/codemod_helpers.rs b/crates/ide/src/codemod_helpers.rs
index 2ecd21e82c..e06ceafd61 100644
--- a/crates/ide/src/codemod_helpers.rs
+++ b/crates/ide/src/codemod_helpers.rs
@@ -573,8 +573,8 @@ pub(crate) fn find_call_in_function<CallCtx, MakeCtx, Res>(
                 };
                 if let Some(extra) = check_call(context) {
                     // Got one.
-                    let call_expr_id = if let Some((hir_idx, _macro_def)) = ctx.in_macro {
-                        hir_idx.idx
+                    let call_expr_id = if let Some(expr_id) = ctx.in_macro {
+                        expr_id.idx
                     } else {
                         ctx.item_id
                     };
diff --git a/crates/ide/src/diagnostics.rs b/crates/ide/src/diagnostics.rs
index eb6bae611b..f9373e25b4 100644
--- a/crates/ide/src/diagnostics.rs
+++ b/crates/ide/src/diagnostics.rs
@@ -50,7 +50,6 @@ use elp_ide_db::text_edit::TextEdit;
 use elp_ide_ssr::Match;
 use elp_ide_ssr::SsrSearchScope;
 use elp_ide_ssr::match_pattern;
-use elp_project_model::AppName;
 use elp_syntax::NodeOrToken;
 use elp_syntax::Parse;
 use elp_syntax::SourceFile;
@@ -97,13 +96,13 @@ mod application_env;
 mod atoms_exhaustion;
 mod binary_string_to_sigil;
 mod boolean_precedence;
-mod bound_variable;
 mod could_be_a_string_literal;
 mod cross_node_eval;
 mod debugging_function;
 mod dependent_header;
 mod deprecated_function;
 mod duplicate_module;
+mod edoc;
 mod effect_free_statement;
 mod equality_check_with_unnecessary_operator;
 mod eqwalizer_assists;
@@ -118,7 +117,7 @@ mod macro_precedence_suprise;
 mod map_find_to_syntax;
 mod map_insertion_to_syntax;
 mod meck;
-// @fb-only: mod meta_only;
+// @fb-only
 mod missing_compile_warn_missing_spec;
 mod missing_module;
 mod missing_separator;
@@ -132,7 +131,6 @@ mod no_garbage_collect;
 mod no_nowarn_suppressions;
 mod no_size;
 mod nonstandard_integer_formatting;
-mod old_edoc_syntax;
 mod record_tuple_match;
 mod redundant_assignment;
 mod replace_call;
@@ -551,37 +549,12 @@ pub(crate) trait Linter {
     }
 }
 
-fn should_process_app(
-    app_name: &Option<AppName>,
-    config: &DiagnosticsConfig,
-    diagnostic_code: &DiagnosticCode,
-) -> bool {
-    let app = match app_name {
-        Some(app) => app.to_string(),
-        None => return true,
-    };
-
-    if let Some(lint_config) = config.lint_config.as_ref()
-        && let Some(linter_config) = lint_config.linters.get(diagnostic_code)
-        && let Some(ref excluded) = linter_config.exclude_apps
-        && excluded.contains(&app)
-    {
-        return false;
-    }
-
-    true
-}
-
 fn should_run(
     linter: &dyn Linter,
     config: &DiagnosticsConfig,
-    app_name: &Option<AppName>,
     is_generated: bool,
     is_test: bool,
 ) -> bool {
-    if !should_process_app(app_name, config, &linter.id()) {
-        return false;
-    }
     let is_enabled = if let Some(lint_config) = config.lint_config.as_ref() {
         lint_config
             .get_is_enabled_override(&linter.id())
@@ -892,7 +865,6 @@ pub(crate) trait GenericLinter: Linter {
     fn fixes(
         &self,
         _context: &Self::Context,
-        _range: TextRange,
         _sema: &Semantic,
         _file_id: FileId,
     ) -> Option<Vec<Assist>> {
@@ -926,7 +898,7 @@ impl<T: GenericLinter> GenericDiagnostics for T {
         if let Some(matches) = self.matches(sema, file_id) {
             for matched in matches {
                 let message = self.match_description(&matched.context);
-                let fixes = self.fixes(&matched.context, matched.range, sema, file_id);
+                let fixes = self.fixes(&matched.context, sema, file_id);
                 let tag = self.tag(&matched.context);
                 let mut d = Diagnostic::new(self.id(), message, matched.range)
                     .with_fixes(fixes)
@@ -1244,16 +1216,6 @@ impl LintConfig {
         self.linters.get(diagnostic_code)?.experimental
     }
 
-    /// Get the exclude_apps override for a linter based on its diagnostic code.
-    pub fn get_exclude_apps_override(
-        &self,
-        diagnostic_code: &DiagnosticCode,
-    ) -> Option<Vec<String>> {
-        self.linters
-            .get(diagnostic_code)
-            .and_then(|c| c.exclude_apps.clone())
-    }
-
     pub fn get_function_call_linter_config(
         &self,
         diagnostic_code: &DiagnosticCode,
@@ -1377,7 +1339,6 @@ pub struct LinterConfig {
     pub include_tests: Option<bool>,
     pub include_generated: Option<bool>,
     pub experimental: Option<bool>,
-    pub exclude_apps: Option<Vec<String>>,
     #[serde(flatten)]
     pub config: Option<LinterTraitConfig>,
 }
@@ -1398,7 +1359,6 @@ impl LinterConfig {
             include_tests: other.include_tests.or(self.include_tests),
             include_generated: other.include_generated.or(self.include_generated),
             experimental: other.experimental.or(self.experimental),
-            exclude_apps: other.exclude_apps.or(self.exclude_apps),
             config: merged_config,
         }
     }
@@ -1564,7 +1524,7 @@ pub fn native_diagnostics(
         config
             .lints_from_config
             .get_diagnostics(&mut res, &sema, file_id);
-        // @fb-only: meta_only::diagnostics(&mut res, &sema, file_id, file_kind, config);
+        // @fb-only
         syntax_diagnostics(&sema, &parse, &mut res, file_id);
         diagnostics_from_descriptors(
             &mut res,
@@ -1593,7 +1553,6 @@ pub fn native_diagnostics(
     } else {
         FxHashMap::default()
     };
-    let app_name = db.file_app_name(file_id);
     let metadata = db.elp_metadata(file_id);
     // TODO: can we  ever disable DiagnosticCode::SyntaxError?
     //       In which case we must check labeled_syntax_errors
@@ -1602,7 +1561,6 @@ pub fn native_diagnostics(
             && (config.experimental && d.has_category(Category::Experimental)
                 || !d.has_category(Category::Experimental))
             && !d.should_be_suppressed(&metadata, config)
-            && should_process_app(&app_name, config, &d.code)
     });
 
     LabeledDiagnostics {
@@ -1653,20 +1611,20 @@ pub fn diagnostics_from_descriptors(
         .db
         .is_test_suite_or_test_helper(file_id)
         .unwrap_or(false);
-    let app_name = sema.db.file_app_name(file_id);
     descriptors.iter().for_each(|descriptor| {
         if descriptor.conditions.enabled(config, is_generated, is_test) {
-            let mut diags: Vec<Diagnostic> = Vec::default();
-            (descriptor.checker)(&mut diags, sema, file_id, file_kind);
-            for diag in diags {
-                // Check if this diagnostic is enabled (for default_disabled descriptors)
-                // and if the app is not excluded for this diagnostic code
-                let is_enabled =
-                    !descriptor.conditions.default_disabled || config.enabled.contains(&diag.code);
-                let app_allowed = should_process_app(&app_name, config, &diag.code);
-                if is_enabled && app_allowed {
-                    res.push(diag);
+            if descriptor.conditions.default_disabled {
+                // Filter the returned diagnostics to ensure they are
+                // enabled
+                let mut diags: Vec<Diagnostic> = Vec::default();
+                (descriptor.checker)(&mut diags, sema, file_id, file_kind);
+                for diag in diags {
+                    if config.enabled.contains(&diag.code) {
+                        res.push(diag);
+                    }
                 }
+            } else {
+                (descriptor.checker)(res, sema, file_id, file_kind);
             }
         }
     });
@@ -1723,12 +1681,11 @@ const GENERIC_LINTERS: &[&dyn GenericDiagnostics] = &[
     &duplicate_module::LINTER,
     &no_nowarn_suppressions::LINTER,
     &macro_precedence_suprise::LINTER,
-    &old_edoc_syntax::LINTER,
+    &edoc::LINTER,
     &missing_module::LINTER,
     &unused_include::LINTER,
     &misspelled_attribute::LINTER,
     &boolean_precedence::LINTER,
-    &bound_variable::LINTER,
 ];
 
 /// Unified registry for all types of linters
@@ -1757,7 +1714,7 @@ pub(crate) fn linters() -> Vec<DiagnosticLinter> {
     );
 
     // Add meta-only linters
-    // @fb-only: all_linters.extend(meta_only::linters());
+    // @fb-only
 
     all_linters
 }
@@ -1774,12 +1731,11 @@ fn diagnostics_from_linters(
         .db
         .is_test_suite_or_test_helper(file_id)
         .unwrap_or(false);
-    let app_name = sema.db.file_app_name(file_id);
 
     for l in linters {
         let linter = l.as_linter();
         if linter.should_process_file_id(sema, file_id)
-            && should_run(linter, config, &app_name, is_generated, is_test)
+            && should_run(linter, config, is_generated, is_test)
         {
             let severity = if let Some(lint_config) = config.lint_config.as_ref() {
                 lint_config
@@ -2341,14 +2297,11 @@ pub fn erlang_service_diagnostics(
             diags
         };
 
-        let app_name = db.file_app_name(file_id);
         let metadata = db.elp_metadata(file_id);
         let diags = diags
             .into_iter()
             .filter(|(_file_id, d)| {
-                !d.should_be_suppressed(&metadata, config)
-                    && !config.disabled.contains(&d.code)
-                    && should_process_app(&app_name, config, &d.code)
+                !d.should_be_suppressed(&metadata, config) && !config.disabled.contains(&d.code)
             })
             .map(|(file_id, d)| {
                 (
@@ -2639,7 +2592,7 @@ pub fn ct_diagnostics(
         CommonTestInfo::Result { all, groups } => {
             let testcases = common_test::runnable_names(&sema, file_id, all, groups).ok();
             common_test::unreachable_test(&mut res, &sema, file_id, &testcases);
-            // @fb-only: meta_only::ct_diagnostics(&mut res, &sema, file_id, testcases);
+            // @fb-only
         }
         CommonTestInfo::EvalError(_error) => {
             // The error currently does not contain anything useful, so we ignore it
@@ -3236,7 +3189,6 @@ mod tests {
     fn syntax_error() {
         check_diagnostics(
             r#"
-//- expect_parse_errors
 -module(main).
 foo() -> XX 3.0.
     %%   ^^ error: P1711: Syntax Error
@@ -3414,7 +3366,6 @@ main(X) ->
     #[test]
     fn label_syntax_error_not_function() {
         let fixture_str = r#"
-  //- expect_parse_errors
     -module(main).
     -record(person, {(name + XXX)}).
   %%                 ^^^^^^^ error: P1711: Syntax Error
@@ -3430,7 +3381,7 @@ main(X) ->
         expect![[r#"
             Some(
                 Range(
-                    5..45,
+                    24..56,
                 ),
             )
         "#]]
@@ -3589,7 +3540,6 @@ main(X) ->
             config,
             &extra_diags,
             r#"
-             //- expect_parse_errors
              -module(main).
 
              -export([foo/0,bar/0]).
@@ -3610,7 +3560,7 @@ main(X) ->
     #[test]
     fn group_related_diagnostics_elp_only() {
         // Demonstrate that ELP does not pick up a syntax error in the
-        // spec, same code as in test/test_projects/diagnostics/app_a/src/syntax.erl
+        // spec, same code as in test_projects/diagnostics/app_a/src/syntax.erl
         check_diagnostics(
             r#"
              -module(main).
@@ -3627,7 +3577,6 @@ main(X) ->
         check_diagnostics(
             r#"
              //- erlang_service
-             //- expect_parse_errors
              //- /src/a_mod.erl app:app_a
              -module(a_mod).
              -export([foo/0]).
@@ -3646,7 +3595,6 @@ main(X) ->
         check_diagnostics(
             r#"
              //- erlang_service
-             //- expect_parse_errors
              //- native
              //- /src/a_mod.erl app:app_a
              -module(a_mod).
@@ -3725,7 +3673,6 @@ main(X) ->
     fn test_nested_syntax_errors() {
         check_diagnostics(
             r#"
-            //- expect_parse_errors
             -module(main).
             run() ->
                 ExitCode =
@@ -4039,7 +3986,6 @@ main(X) ->
                 include_tests: None,
                 include_generated: None,
                 experimental: None,
-                exclude_apps: None,
                 config: None,
             },
         );
@@ -4082,7 +4028,6 @@ main(X) ->
                 include_tests: Some(true),
                 include_generated: None,
                 experimental: None,
-                exclude_apps: None,
                 config: None,
             },
         );
@@ -4124,7 +4069,6 @@ main(X) ->
                 include_tests: None,
                 include_generated: Some(true),
                 experimental: None,
-                exclude_apps: None,
                 config: None,
             },
         );
@@ -4167,7 +4111,6 @@ main(X) ->
                 include_tests: None,
                 include_generated: None,
                 experimental: Some(true),
-                exclude_apps: None,
                 config: None,
             },
         );
@@ -4212,7 +4155,6 @@ main(X) ->
                 include_tests: None,
                 include_generated: None,
                 experimental: None,
-                exclude_apps: None,
                 config: None,
             },
         );
@@ -4243,47 +4185,6 @@ main(X) ->
         );
     }
 
-    #[test]
-    fn test_linter_exclude_apps_override() {
-        let mut lint_config = LintConfig::default();
-        lint_config.linters.insert(
-            DiagnosticCode::NoGarbageCollect,
-            LinterConfig {
-                is_enabled: Some(false),
-                severity: None,
-                include_tests: None,
-                include_generated: None,
-                experimental: None,
-                exclude_apps: Some(vec!["my_app".to_string()]),
-                config: None,
-            },
-        );
-
-        let config = DiagnosticsConfig::default()
-            .configure_diagnostics(
-                &lint_config,
-                &Some("no_garbage_collect".to_string()),
-                &None,
-                FallBackToAll::No,
-            )
-            .unwrap();
-        check_diagnostics_with_config(
-            config,
-            r#"
-            //- /src/main.erl app:my_app
-            -module(main).
-            -export([warning/0]).
-
-            warning() ->
-                erlang:garbage_collect().
-            //- /opt/lib/stdlib-3.17/src/erlang.erl otp_app:/opt/lib/stdlib-3.17
-            -module(erlang).
-            -export([garbage_collect/0]).
-            garbage_collect() -> ok.
-            "#,
-        );
-    }
-
     #[test]
     fn no_unused_macro_in_macro_rhs_for_function_name() {
         let config = DiagnosticsConfig::default()
@@ -4331,7 +4232,6 @@ main(X) ->
                 include_tests: None,
                 include_generated: None,
                 experimental: None,
-                exclude_apps: None,
                 config: Some(LinterTraitConfig::FunctionCallLinterConfig(
                     FunctionCallLinterConfig {
                         include: Some(vec![FunctionMatch::mf("mod_a", "func_a")]),
@@ -4364,7 +4264,6 @@ main(X) ->
                 include_tests: Some(true),
                 include_generated: None,
                 experimental: None,
-                exclude_apps: None,
                 config: Some(LinterTraitConfig::FunctionCallLinterConfig(
                     FunctionCallLinterConfig {
                         include: Some(vec![FunctionMatch::mf("mod_b", "func_b")]),
@@ -4382,7 +4281,6 @@ main(X) ->
                 include_tests: None,
                 include_generated: Some(true),
                 experimental: None,
-                exclude_apps: None,
                 config: None,
             },
         );
diff --git a/crates/ide/src/diagnostics/application_env.rs b/crates/ide/src/diagnostics/application_env.rs
index 615b7801f9..1e4fe7c4cf 100644
--- a/crates/ide/src/diagnostics/application_env.rs
+++ b/crates/ide/src/diagnostics/application_env.rs
@@ -28,7 +28,7 @@ use crate::codemod_helpers::CheckCallCtx;
 use crate::codemod_helpers::FunctionMatch;
 use crate::codemod_helpers::MatchCtx;
 use crate::codemod_helpers::find_call_in_function;
-// @fb-only: use crate::diagnostics;
+// @fb-only
 use crate::diagnostics::DiagnosticCode;
 use crate::diagnostics::Severity;
 
@@ -36,7 +36,7 @@ pub(crate) static DESCRIPTOR: DiagnosticDescriptor = DiagnosticDescriptor {
     conditions: DiagnosticConditions {
         experimental: false,
         include_generated: true,
-        include_tests: false,
+        include_tests: true,
         default_disabled: false,
     },
     checker: &|diags, sema, file_id, _ext| {
@@ -108,7 +108,7 @@ fn check_function(diags: &mut Vec<Diagnostic>, sema: &Semantic, def: &FunctionDe
                 vec![2, 3],
                 BadEnvCallAction::AppArg(0),
             ),
-            // @fb-only: diagnostics::meta_only::application_env_bad_matches(),
+            // @fb-only
         ]
         .into_iter()
         .flatten()
diff --git a/crates/ide/src/diagnostics/atoms_exhaustion.rs b/crates/ide/src/diagnostics/atoms_exhaustion.rs
index 56a43a50ca..4708e35b1f 100644
--- a/crates/ide/src/diagnostics/atoms_exhaustion.rs
+++ b/crates/ide/src/diagnostics/atoms_exhaustion.rs
@@ -13,7 +13,7 @@ use hir::Semantic;
 
 use crate::FunctionMatch;
 use crate::codemod_helpers::CheckCallCtx;
-// @fb-only: use crate::diagnostics;
+// @fb-only
 use crate::diagnostics::DiagnosticCode;
 use crate::diagnostics::FunctionCallLinter;
 use crate::diagnostics::Linter;
@@ -35,9 +35,9 @@ impl Linter for AtomsExhaustionLinter {
         false
     }
     #[rustfmt::skip]
-    // @fb-only: fn should_process_file_id(&self, sema: &Semantic, file_id: FileId) -> bool {
+    // @fb-only
     fn should_process_file_id(&self, _sema: &Semantic, _file_id: FileId) -> bool { // @oss-only
-        // @fb-only: diagnostics::meta_only::is_relevant_file(sema.db.upcast(), file_id)
+        // @fb-only
         true // @oss-only
     }
 }
@@ -56,16 +56,16 @@ impl FunctionCallLinter for AtomsExhaustionLinter {
                 // FunctionMatch::mfa("erlang", "binary_to_term", 2),
             ]
             .into_iter()
-            // @fb-only: .chain(diagnostics::meta_only::atoms_exhaustion_matches().into_iter())
+            // @fb-only
             .collect::<Vec<_>>()
         ]
     }
 
     fn check_match(&self, context: &CheckCallCtx<'_, ()>) -> Option<Self::Context> {
         #[rustfmt::skip]
-        // @fb-only: let sema = context.in_clause.sema;
-        // @fb-only: let is_safe =
-            // @fb-only: diagnostics::meta_only::atoms_exhaustion_is_safe(sema, context.in_clause, context.parents);
+        // @fb-only
+        // @fb-only
+            // @fb-only
         let is_safe = false; // @oss-only
         if !is_safe {
             match context.args.as_slice() {
diff --git a/crates/ide/src/diagnostics/boolean_precedence.rs b/crates/ide/src/diagnostics/boolean_precedence.rs
index f8f7851f8a..21e374a4f5 100644
--- a/crates/ide/src/diagnostics/boolean_precedence.rs
+++ b/crates/ide/src/diagnostics/boolean_precedence.rs
@@ -66,6 +66,7 @@ impl Linter for BooleanPrecedenceLinter {
 
 #[derive(Debug, Clone, PartialEq, Eq, Default)]
 pub struct Context {
+    range: TextRange,
     preceding_ws_range: TextRange,
     op: Op,
     lhs_complex: bool,
@@ -100,7 +101,6 @@ impl GenericLinter for BooleanPrecedenceLinter {
     fn fixes(
         &self,
         context: &Self::Context,
-        range: TextRange,
         _sema: &Semantic,
         file_id: FileId,
     ) -> Option<Vec<Assist>> {
@@ -109,36 +109,36 @@ impl GenericLinter for BooleanPrecedenceLinter {
         // Add "replace with preferred operator" fix
         let assist_message = format!("Replace '{}' with '{}'", context.op, context.op.preferred());
         let edit = TextEdit::replace(
-            context.op.range(range, context.preceding_ws_range),
+            context.op.range(context.range, context.preceding_ws_range),
             context.op.preferred().to_string(),
         );
         fixes.push(fix(
             "replace_boolean_operator",
             &assist_message,
             SourceChange::from_text_edit(file_id, edit),
-            range,
+            context.range,
         ));
 
         // Add "add parens" fixes if applicable
         if context.lhs_complex {
-            fixes.push(parens_fix("LHS", file_id, context, range));
+            fixes.push(parens_fix("LHS", file_id, context));
         }
         if context.rhs_complex {
-            fixes.push(parens_fix("RHS", file_id, context, range));
+            fixes.push(parens_fix("RHS", file_id, context));
         }
 
         Some(fixes)
     }
 }
 
-fn parens_fix(side: &str, file_id: FileId, context: &Context, range: TextRange) -> Assist {
+fn parens_fix(side: &str, file_id: FileId, context: &Context) -> Assist {
     let assist_message = format!("Add parens to {side}");
     let edit = add_parens_edit(&context.add_parens_range);
     fix(
         "replace_boolean_operator_add_parens",
         &assist_message,
         SourceChange::from_text_edit(file_id, edit),
-        range,
+        context.range,
     )
 }
 
@@ -231,6 +231,7 @@ fn collect_match(
             matches.push(GenericLinterMatchContext {
                 range,
                 context: Context {
+                    range,
                     preceding_ws_range,
                     op: binop,
                     lhs_complex,
diff --git a/crates/ide/src/diagnostics/bound_variable.rs b/crates/ide/src/diagnostics/bound_variable.rs
deleted file mode 100644
index 92f0edadfa..0000000000
--- a/crates/ide/src/diagnostics/bound_variable.rs
+++ /dev/null
@@ -1,178 +0,0 @@
-/*
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is dual-licensed under either the MIT license found in the
- * LICENSE-MIT file in the root directory of this source tree or the Apache
- * License, Version 2.0 found in the LICENSE-APACHE file in the root directory
- * of this source tree. You may select, at your option, one of the
- * above-listed licenses.
- */
-
-// Diagnostic: bound_variable
-//
-// Return a warning if the LHS of a match already contains a bound variable.
-//
-
-use elp_ide_db::elp_base_db::FileId;
-use hir::AnyExpr;
-use hir::Expr;
-use hir::Semantic;
-use hir::Strategy;
-use hir::fold::MacroStrategy;
-use hir::fold::ParenStrategy;
-
-use crate::diagnostics::DiagnosticCode;
-use crate::diagnostics::GenericLinter;
-use crate::diagnostics::GenericLinterMatchContext;
-use crate::diagnostics::Linter;
-
-pub(crate) struct BoundVariableLinter;
-
-impl Linter for BoundVariableLinter {
-    fn id(&self) -> DiagnosticCode {
-        DiagnosticCode::BoundVarInLhs
-    }
-
-    fn description(&self) -> &'static str {
-        "Match on a bound variable"
-    }
-}
-
-impl GenericLinter for BoundVariableLinter {
-    type Context = ();
-
-    fn matches(
-        &self,
-        sema: &Semantic,
-        file_id: FileId,
-    ) -> Option<Vec<GenericLinterMatchContext<Self::Context>>> {
-        let bound_vars_by_function = sema.bound_vars_by_function(file_id);
-        let mut res = Vec::new();
-        sema.def_map(file_id)
-            .get_function_clauses()
-            .for_each(|(_, def)| {
-                if def.file.file_id == file_id
-                    && let Some(bound_vars) = bound_vars_by_function.get(&def.function_clause_id)
-                {
-                    let in_clause = def.in_clause(sema, def);
-                    in_clause.fold_clause(
-                        Strategy {
-                            macros: MacroStrategy::ExpandButIncludeMacroCall,
-                            parens: ParenStrategy::InvisibleParens,
-                        },
-                        (),
-                        &mut |acc, ctx| {
-                            if let AnyExpr::Expr(Expr::Match { lhs, rhs: _ }) = ctx.item
-                                && bound_vars.contains(&lhs)
-                                && let Some(range) = in_clause.range_for_pat(lhs)
-                                && range.file_id == def.file.file_id
-                                && ctx.in_macro.is_none()
-                            {
-                                res.push(GenericLinterMatchContext {
-                                    range: range.range,
-                                    context: (),
-                                });
-                            };
-                            acc
-                        },
-                    );
-                }
-            });
-
-        Some(res)
-    }
-}
-
-pub static LINTER: BoundVariableLinter = BoundVariableLinter;
-
-#[cfg(test)]
-mod test {
-    use elp_ide_db::DiagnosticCode;
-    use expect_test::Expect;
-
-    use crate::diagnostics::DiagnosticsConfig;
-    use crate::tests::check_diagnostics_with_config;
-    use crate::tests::check_fix_with_config;
-
-    #[track_caller]
-    pub(crate) fn check_diagnostics(fixture: &str) {
-        let config = DiagnosticsConfig::default().disable(DiagnosticCode::UndefinedFunction);
-        check_diagnostics_with_config(config, fixture)
-    }
-
-    #[track_caller]
-    pub(crate) fn check_fix(fixture_before: &str, fixture_after: Expect) {
-        let config = DiagnosticsConfig::default().disable(DiagnosticCode::UndefinedFunction);
-        check_fix_with_config(config, fixture_before, fixture_after)
-    }
-    #[test]
-    fn bound_variable() {
-        check_diagnostics(
-            r#"
-             //- /src/bound.erl
-             -module(bound).
-
-             foo() ->
-                 AA = bar(),
-                 AA = bar().
-              %% ^^ 💡 warning: W0060: Match on a bound variable
-
-            "#,
-        )
-    }
-
-    #[test]
-    fn bound_variable_not_reported_in_case() {
-        check_diagnostics(
-            r#"
-             //- /src/bound.erl
-             -module(bound).
-
-             foo(Val) ->
-                 case Val of
-                    undefined -> ok;
-                    Val when is_list(Val) -> ok
-                 end.
-
-            "#,
-        )
-    }
-
-    #[test]
-    fn bound_variable_not_reported_in_macro() {
-        check_diagnostics(
-            r#"
-             //- /src/bound.erl
-             -module(bound).
-             -include("inc.hrl").
-
-             foo(Val) ->
-                 ?A_MACRO(Val).
-             //- /src/inc.hrl
-             -define(A_MACRO(X), X=X).
-            "#,
-        )
-    }
-
-    #[test]
-    fn bound_variable_ignore_fix() {
-        check_fix(
-            r#"
-             //- /src/bound.erl
-             -module(bound).
-
-             foo() ->
-                 AA = bar(),
-                 A~A = bar().
-            "#,
-            expect_test::expect![[r#"
-                -module(bound).
-
-                foo() ->
-                    AA = bar(),
-                    % elp:ignore W0060 (bound_var_in_lhs)
-                    AA = bar().
-            "#]],
-        )
-    }
-}
diff --git a/crates/ide/src/diagnostics/debugging_function.rs b/crates/ide/src/diagnostics/debugging_function.rs
index 1f0099781d..94c3d11364 100644
--- a/crates/ide/src/diagnostics/debugging_function.rs
+++ b/crates/ide/src/diagnostics/debugging_function.rs
@@ -22,7 +22,7 @@ use crate::diagnostics::DiagnosticCode;
 use crate::diagnostics::FunctionCallLinter;
 use crate::diagnostics::Linter;
 use crate::diagnostics::Severity;
-// @fb-only: use crate::diagnostics::meta_only;
+// @fb-only
 use crate::lazy_function_matches;
 
 pub(crate) struct NoDebuggingFunctionLinter;
@@ -52,7 +52,7 @@ impl FunctionCallLinter for NoDebuggingFunctionLinter {
         lazy_function_matches![
             vec![FunctionMatch::m("redbug")]
                 .into_iter()
-                // @fb-only: .chain(meta_only::debugging_function_matches().into_iter())
+                // @fb-only
                 .collect::<Vec<_>>()
         ]
     }
diff --git a/crates/ide/src/diagnostics/deprecated_function.rs b/crates/ide/src/diagnostics/deprecated_function.rs
index b353d824d2..540edfcca3 100644
--- a/crates/ide/src/diagnostics/deprecated_function.rs
+++ b/crates/ide/src/diagnostics/deprecated_function.rs
@@ -41,7 +41,7 @@ use super::DiagnosticDescriptor;
 use super::Severity;
 use crate::codemod_helpers::FunctionMatch;
 use crate::codemod_helpers::FunctionMatcher;
-// @fb-only: use crate::diagnostics;
+// @fb-only
 use crate::fix;
 
 pub(crate) static DESCRIPTOR: DiagnosticDescriptor = DiagnosticDescriptor {
@@ -88,7 +88,7 @@ fn deprecated_function(diagnostics: &mut Vec<Diagnostic>, sema: &Semantic, file_
     lazy_static! {
         static ref DEPRECATED_FUNCTIONS: Vec<(FunctionMatch, DeprecationDetails)> = {
             let matches: Vec<Vec<(FunctionMatch, DeprecationDetails)>>  = vec![
-                // @fb-only: diagnostics::meta_only::deprecated_function_matches(),
+                // @fb-only
             ];
             matches.into_iter()
         .flatten()
@@ -134,8 +134,8 @@ fn check_function(
                     );
                     let details = match_result.map(|(_match, details)| details.clone());
                     if target_def.deprecated || match_result.is_some() {
-                        let expr_id = if let Some((hir_idx, _macro_def)) = ctx.in_macro {
-                            hir_idx.idx
+                        let expr_id = if let Some(expr_id) = ctx.in_macro {
+                            expr_id.idx
                         } else {
                             ctx.item_id
                         };
diff --git a/crates/ide/src/diagnostics/old_edoc_syntax.rs b/crates/ide/src/diagnostics/edoc.rs
similarity index 97%
rename from crates/ide/src/diagnostics/old_edoc_syntax.rs
rename to crates/ide/src/diagnostics/edoc.rs
index da4c3f2430..ead44d7331 100644
--- a/crates/ide/src/diagnostics/old_edoc_syntax.rs
+++ b/crates/ide/src/diagnostics/edoc.rs
@@ -8,7 +8,7 @@
  * above-listed licenses.
  */
 
-// Diagnostic: old_edoc_syntax
+// Diagnostic: edoc
 
 use elp_ide_assists::Assist;
 use elp_ide_assists::helpers;
@@ -31,10 +31,11 @@ use super::DiagnosticCode;
 use super::GenericLinter;
 use super::GenericLinterMatchContext;
 use super::Linter;
+use super::Severity;
 
-pub(crate) struct OldEdocSyntaxLinter;
+pub(crate) struct EdocLinter;
 
-impl Linter for OldEdocSyntaxLinter {
+impl Linter for EdocLinter {
     fn id(&self) -> DiagnosticCode {
         DiagnosticCode::OldEdocSyntax
     }
@@ -43,8 +44,11 @@ impl Linter for OldEdocSyntaxLinter {
         "EDoc style comments are deprecated. Please use Markdown instead."
     }
 
-    fn should_process_test_files(&self) -> bool {
-        false
+    fn severity(&self, sema: &Semantic, file_id: FileId) -> Severity {
+        match sema.db.is_test_suite_or_test_helper(file_id) {
+            Some(true) => Severity::WeakWarning,
+            _ => Severity::Warning,
+        }
     }
 }
 
@@ -52,9 +56,10 @@ impl Linter for OldEdocSyntaxLinter {
 pub struct Context {
     header_ptr: Option<InFileAstPtr<ast::Form>>,
     doc_start: TextSize,
+    range: TextRange,
 }
 
-impl GenericLinter for OldEdocSyntaxLinter {
+impl GenericLinter for EdocLinter {
     type Context = Context;
 
     fn matches(
@@ -72,6 +77,7 @@ impl GenericLinter for OldEdocSyntaxLinter {
                             context: Context {
                                 header_ptr: Some(*header_ptr),
                                 doc_start,
+                                range: doc.range,
                             },
                         });
                     }
@@ -82,6 +88,7 @@ impl GenericLinter for OldEdocSyntaxLinter {
                             context: Context {
                                 header_ptr: Some(*header_ptr),
                                 doc_start,
+                                range: equiv.range,
                             },
                         });
                     }
@@ -92,6 +99,7 @@ impl GenericLinter for OldEdocSyntaxLinter {
                             context: Context {
                                 header_ptr: Some(*header_ptr),
                                 doc_start,
+                                range: deprecated.range,
                             },
                         });
                     }
@@ -103,6 +111,7 @@ impl GenericLinter for OldEdocSyntaxLinter {
                         context: Context {
                             header_ptr: Some(*header_ptr),
                             doc_start,
+                            range: hidden.range,
                         },
                     });
                 }
@@ -114,7 +123,6 @@ impl GenericLinter for OldEdocSyntaxLinter {
     fn fixes(
         &self,
         context: &Self::Context,
-        range: TextRange,
         sema: &Semantic,
         file_id: FileId,
     ) -> Option<Vec<Assist>> {
@@ -126,12 +134,12 @@ impl GenericLinter for OldEdocSyntaxLinter {
             file_id,
             header,
             context.doc_start,
-            range,
+            context.range,
         )])
     }
 }
 
-pub static LINTER: OldEdocSyntaxLinter = OldEdocSyntaxLinter;
+pub static LINTER: EdocLinter = EdocLinter;
 
 fn old_edoc_syntax_fix(
     sema: &Semantic,
@@ -294,6 +302,22 @@ mod tests {
         )
     }
 
+    #[test]
+    fn test_function_doc_in_test_file() {
+        check_diagnostics(
+            r#"
+    //- /test/main_SUITE.erl extra:test
+    -module(main_SUITE).
+    %% @doc This is the main function documentation.
+    %% ^^^^ 💡 weak: W0038: EDoc style comments are deprecated. Please use Markdown instead.
+    main() ->
+      dep().
+
+    dep() -> ok.
+        "#,
+        )
+    }
+
     #[test]
     fn test_function_doc_different_arities() {
         check_diagnostics(
diff --git a/crates/ide/src/diagnostics/macro_precedence_suprise.rs b/crates/ide/src/diagnostics/macro_precedence_suprise.rs
index 6cd5fe2429..838ddb3d9c 100644
--- a/crates/ide/src/diagnostics/macro_precedence_suprise.rs
+++ b/crates/ide/src/diagnostics/macro_precedence_suprise.rs
@@ -35,7 +35,9 @@ use crate::diagnostics::Linter;
 use crate::fix;
 
 #[derive(Debug, Default, Clone, PartialEq)]
-pub(crate) struct MacroPrecedenceContext;
+pub(crate) struct MacroPrecedenceContext {
+    range: TextRange,
+}
 
 pub(crate) struct MacroPrecedenceSupriseLinter;
 
@@ -94,9 +96,10 @@ impl GenericLinter for MacroPrecedenceSupriseLinter {
                             {
                                 let range = ast.range();
                                 if range.file_id == file_id {
+                                    let context = MacroPrecedenceContext { range: range.range };
                                     res.push(GenericLinterMatchContext {
                                         range: range.range,
-                                        context: MacroPrecedenceContext,
+                                        context,
                                     });
                                 }
                             }
@@ -110,17 +113,16 @@ impl GenericLinter for MacroPrecedenceSupriseLinter {
 
     fn fixes(
         &self,
-        _context: &Self::Context,
-        range: TextRange,
+        context: &Self::Context,
         _sema: &Semantic,
         file_id: FileId,
     ) -> Option<Vec<Assist>> {
-        let edit = add_parens_edit(&range);
+        let edit = add_parens_edit(&context.range);
         let fix = fix(
             "macro_precedence_add_parens",
             "Add parens to macro call",
             SourceChange::from_text_edit(file_id, edit),
-            range,
+            context.range,
         );
         Some(vec![fix])
     }
diff --git a/crates/ide/src/diagnostics/missing_compile_warn_missing_spec.rs b/crates/ide/src/diagnostics/missing_compile_warn_missing_spec.rs
index dd0b677dce..b1f24eb60f 100644
--- a/crates/ide/src/diagnostics/missing_compile_warn_missing_spec.rs
+++ b/crates/ide/src/diagnostics/missing_compile_warn_missing_spec.rs
@@ -75,6 +75,7 @@ impl Linter for MissingCompileWarnMissingSpec {
 pub struct Context {
     found: Found,
     compile_option_id: Option<CompileOptionId>,
+    target_range: TextRange,
 }
 
 impl GenericLinter for MissingCompileWarnMissingSpec {
@@ -93,6 +94,7 @@ impl GenericLinter for MissingCompileWarnMissingSpec {
                 context: Context {
                     found: Found::No,
                     compile_option_id: None,
+                    target_range: DIAGNOSTIC_WHOLE_FILE_RANGE,
                 },
             });
         }
@@ -147,6 +149,7 @@ impl GenericLinter for MissingCompileWarnMissingSpec {
                     context: Context {
                         found: what.0,
                         compile_option_id: what.1,
+                        target_range: range,
                     },
                 });
             }
@@ -157,7 +160,6 @@ impl GenericLinter for MissingCompileWarnMissingSpec {
     fn fixes(
         &self,
         context: &Self::Context,
-        range: TextRange,
         sema: &Semantic,
         file_id: FileId,
     ) -> Option<Vec<elp_ide_assists::Assist>> {
@@ -182,7 +184,7 @@ impl GenericLinter for MissingCompileWarnMissingSpec {
             "add_warn_missing_spec_all",
             "Add compile option 'warn_missing_spec_all'",
             edit,
-            range,
+            context.target_range,
         )])
     }
 }
diff --git a/crates/ide/src/diagnostics/misspelled_attribute.rs b/crates/ide/src/diagnostics/misspelled_attribute.rs
index 15ad1dd9d8..f328f57b20 100644
--- a/crates/ide/src/diagnostics/misspelled_attribute.rs
+++ b/crates/ide/src/diagnostics/misspelled_attribute.rs
@@ -55,6 +55,7 @@ impl Linter for MisspelledAttributeLinter {
 
 #[derive(Debug, Clone, PartialEq, Eq, Default)]
 pub struct Context {
+    range: TextRange,
     attr_name: String,
     suggested_rename: String,
 }
@@ -87,6 +88,7 @@ impl GenericLinter for MisspelledAttributeLinter {
                     res.push(GenericLinterMatchContext {
                         range: attr_name_range,
                         context: Context {
+                            range: attr_name_range,
                             attr_name: attr.name.to_string(),
                             suggested_rename: suggested_rename.to_string(),
                         },
@@ -108,17 +110,16 @@ impl GenericLinter for MisspelledAttributeLinter {
     fn fixes(
         &self,
         context: &Self::Context,
-        range: TextRange,
         _sema: &Semantic,
         file_id: FileId,
     ) -> Option<Vec<Assist>> {
-        let edit = TextEdit::replace(range, context.suggested_rename.clone());
+        let edit = TextEdit::replace(context.range, context.suggested_rename.clone());
         let msg = format!("Change to '{}'", context.suggested_rename);
         Some(vec![fix(
             "fix_misspelled_attribute",
             &msg,
             SourceChange::from_text_edit(file_id, edit),
-            range,
+            context.range,
         )])
     }
 }
diff --git a/crates/ide/src/diagnostics/mutable_variable.rs b/crates/ide/src/diagnostics/mutable_variable.rs
index 6878c90d57..52fe32eccf 100644
--- a/crates/ide/src/diagnostics/mutable_variable.rs
+++ b/crates/ide/src/diagnostics/mutable_variable.rs
@@ -27,8 +27,12 @@
 //
 
 use elp_ide_db::elp_base_db::FileId;
+use fxhash::FxHashMap;
+use fxhash::FxHashSet;
 use hir::AnyExpr;
 use hir::Expr;
+use hir::FunctionClauseId;
+use hir::PatId;
 use hir::Semantic;
 use hir::Strategy;
 use hir::fold::MacroStrategy;
@@ -56,7 +60,21 @@ fn mutable_variable_bug(
     sema: &Semantic,
     file_id: FileId,
 ) -> Option<()> {
-    let bound_vars_by_function = sema.bound_vars_by_function(file_id);
+    let mut bound_vars_by_function: FxHashMap<FunctionClauseId, FxHashSet<&PatId>> =
+        FxHashMap::default();
+    let bound_vars = sema.bound_vars_in_pattern_diagnostic(file_id);
+    bound_vars.iter().for_each(|(function_id, pat_id, _var)| {
+        bound_vars_by_function
+            .entry(function_id.value)
+            .and_modify(|vars| {
+                vars.insert(pat_id);
+            })
+            .or_insert_with(|| {
+                let mut vars = FxHashSet::default();
+                vars.insert(pat_id);
+                vars
+            });
+    });
     sema.def_map(file_id)
         .get_function_clauses()
         .for_each(|(_, def)| {
diff --git a/crates/ide/src/diagnostics/no_error_logger.rs b/crates/ide/src/diagnostics/no_error_logger.rs
index 46f3d15e3e..d587d3f3c7 100644
--- a/crates/ide/src/diagnostics/no_error_logger.rs
+++ b/crates/ide/src/diagnostics/no_error_logger.rs
@@ -29,9 +29,6 @@ impl Linter for NoErrorLoggerLinter {
     fn severity(&self, _sema: &Semantic, _file_id: FileId) -> Severity {
         Severity::Error
     }
-    fn should_process_test_files(&self) -> bool {
-        false
-    }
 }
 
 impl FunctionCallLinter for NoErrorLoggerLinter {
diff --git a/crates/ide/src/diagnostics/undefined_function.rs b/crates/ide/src/diagnostics/undefined_function.rs
index 52fa2cfa3c..189edf06f5 100644
--- a/crates/ide/src/diagnostics/undefined_function.rs
+++ b/crates/ide/src/diagnostics/undefined_function.rs
@@ -43,13 +43,6 @@ impl Linter for UndefinedFunctionLinter {
     fn should_process_generated_files(&self) -> bool {
         true
     }
-    // Ideally, we would like to report undefined functions in all files, but
-    // there are too many false positives in test files to do so.
-    // This is often due to mocked modules and test suite cleverness.
-    // We can revisit this decision in the future. See T249044930.
-    fn should_process_test_files(&self) -> bool {
-        false
-    }
 }
 
 impl FunctionCallLinter for UndefinedFunctionLinter {
diff --git a/crates/ide/src/diagnostics/undocumented_module.rs b/crates/ide/src/diagnostics/undocumented_module.rs
index 1b2c80cfc9..eeb4caf7b1 100644
--- a/crates/ide/src/diagnostics/undocumented_module.rs
+++ b/crates/ide/src/diagnostics/undocumented_module.rs
@@ -48,7 +48,9 @@ impl Linter for UndocumentedModuleLinter {
 }
 
 #[derive(Debug, Default, Clone, PartialEq, Eq)]
-pub struct Context;
+pub struct Context {
+    module_name_range: TextRange,
+}
 
 impl GenericLinter for UndocumentedModuleLinter {
     type Context = Context;
@@ -69,21 +71,16 @@ impl GenericLinter for UndocumentedModuleLinter {
         if module_has_no_docs {
             let module_name = module_attribute.name()?;
             let module_name_range = module_name.syntax().text_range();
+            let context = Context { module_name_range };
             res.push(GenericLinterMatchContext {
                 range: module_name_range,
-                context: Context,
+                context,
             });
         }
         Some(res)
     }
 
-    fn fixes(
-        &self,
-        _context: &Context,
-        range: TextRange,
-        sema: &Semantic,
-        file_id: FileId,
-    ) -> Option<Vec<Assist>> {
+    fn fixes(&self, context: &Context, sema: &Semantic, file_id: FileId) -> Option<Vec<Assist>> {
         let insert_offset = helpers::moduledoc_insert_offset(sema, file_id)?;
         let mut builder = SourceChangeBuilder::new(file_id);
         builder.insert(insert_offset, "-moduledoc false.\n");
@@ -92,7 +89,7 @@ impl GenericLinter for UndocumentedModuleLinter {
             "add_moduledoc_false",
             "Add `-moduledoc false.` attribute",
             source_change,
-            range,
+            context.module_name_range,
         );
         Some(vec![fix])
     }
diff --git a/crates/ide/src/diagnostics/unexported_function.rs b/crates/ide/src/diagnostics/unexported_function.rs
index 2e1ebf7f54..7aae73a9f1 100644
--- a/crates/ide/src/diagnostics/unexported_function.rs
+++ b/crates/ide/src/diagnostics/unexported_function.rs
@@ -27,7 +27,7 @@ use crate::codemod_helpers::CheckCallCtx;
 use crate::codemod_helpers::MatchCtx;
 use crate::diagnostics::FunctionCallLinter;
 use crate::diagnostics::Linter;
-// @fb-only: use crate::diagnostics::meta_only;
+// @fb-only
 use crate::fix;
 use crate::lazy_function_matches;
 
@@ -45,9 +45,9 @@ impl Linter for UnexportedFunctionLinter {
     }
     #[rustfmt::skip]
     fn should_process_file_id(&self, _sema: &Semantic, _file_id: FileId) -> bool { // @oss-only
-    // @fb-only: fn should_process_file_id(&self, sema: &Semantic, file_id: FileId) -> bool {
+    // @fb-only
         true // @oss-only
-        // @fb-only: meta_only::should_check_for_unexported(sema, file_id)
+        // @fb-only
     }
 }
 
diff --git a/crates/ide/src/diagnostics/unspecific_include.rs b/crates/ide/src/diagnostics/unspecific_include.rs
index 431740c085..f7405c798a 100644
--- a/crates/ide/src/diagnostics/unspecific_include.rs
+++ b/crates/ide/src/diagnostics/unspecific_include.rs
@@ -152,7 +152,7 @@ fn replace_include_path(
 #[cfg(test)]
 mod tests {
     use elp_ide_db::DiagnosticCode;
-    // @fb-only: use elp_ide_db::meta_only::MetaOnlyDiagnosticCode;
+    // @fb-only
     use expect_test::Expect;
     use expect_test::expect;
 
@@ -173,7 +173,7 @@ mod tests {
     #[track_caller]
     fn check_fix(fixture_before: &str, fixture_after: Expect) {
         let config = DiagnosticsConfig::default()
-            // @fb-only: .disable(DiagnosticCode::MetaOnly(MetaOnlyDiagnosticCode::MalformedInclude))
+            // @fb-only
             .disable(DiagnosticCode::UnusedInclude);
         tests::check_fix_with_config(config, fixture_before, fixture_after)
     }
diff --git a/crates/ide/src/diagnostics/unused_include.rs b/crates/ide/src/diagnostics/unused_include.rs
index eb26bcd923..eed17b3c5c 100644
--- a/crates/ide/src/diagnostics/unused_include.rs
+++ b/crates/ide/src/diagnostics/unused_include.rs
@@ -137,7 +137,6 @@ impl GenericLinter for UnusedIncludeLinter {
     fn fixes(
         &self,
         context: &Self::Context,
-        _range: TextRange,
         _sema: &Semantic,
         file_id: FileId,
     ) -> Option<Vec<Assist>> {
diff --git a/crates/ide/src/diagnostics/unused_macro.rs b/crates/ide/src/diagnostics/unused_macro.rs
index 6ea8756b91..089371f85b 100644
--- a/crates/ide/src/diagnostics/unused_macro.rs
+++ b/crates/ide/src/diagnostics/unused_macro.rs
@@ -88,13 +88,7 @@ impl GenericLinter for UnusedMacroLinter {
         Some(DiagnosticTag::Unused)
     }
 
-    fn fixes(
-        &self,
-        context: &Context,
-        _range: TextRange,
-        _sema: &Semantic,
-        file_id: FileId,
-    ) -> Option<Vec<Assist>> {
+    fn fixes(&self, context: &Context, _sema: &Semantic, file_id: FileId) -> Option<Vec<Assist>> {
         Some(vec![delete_unused_macro(
             file_id,
             context.delete_range,
diff --git a/crates/ide/src/diagnostics_collection.rs b/crates/ide/src/diagnostics_collection.rs
index fe1fc759aa..4abe143dd9 100644
--- a/crates/ide/src/diagnostics_collection.rs
+++ b/crates/ide/src/diagnostics_collection.rs
@@ -415,7 +415,6 @@ mod tests {
             config,
             &extra_diags,
             r#"
-             //- expect_parse_errors
              -module(main).
 
              -export([foo/0,bar/0]).
diff --git a/crates/ide/src/doc_links.rs b/crates/ide/src/doc_links.rs
index 6a85ab3dc3..d13befe8bb 100644
--- a/crates/ide/src/doc_links.rs
+++ b/crates/ide/src/doc_links.rs
@@ -15,9 +15,9 @@ use elp_syntax::AstNode;
 use hir::InFile;
 use hir::Semantic;
 
-// @fb-only: use crate::meta_only::exdoc_links;
+// @fb-only
 
-// @fb-only: mod meta_only;
+// @fb-only
 mod otp_links;
 
 #[derive(Debug, Clone, PartialEq, Eq)]
@@ -40,10 +40,10 @@ pub(crate) fn external_docs(db: &RootDatabase, position: &FilePosition) -> Optio
     if let Some(class) = SymbolClass::classify(&sema, in_file_token.clone()) {
         class.iter().for_each(|def| {
             otp_links::links(&mut doc_links, &sema, &def);
-            // @fb-only: exdoc_links::links(&mut doc_links, &sema, &def);
+            // @fb-only
         });
     }
-    // @fb-only: meta_only::links(&mut doc_links, node, position);
+    // @fb-only
     Some(doc_links)
 }
 
diff --git a/crates/ide/src/expand_macro.rs b/crates/ide/src/expand_macro.rs
index a5a6f759fc..95735a904d 100644
--- a/crates/ide/src/expand_macro.rs
+++ b/crates/ide/src/expand_macro.rs
@@ -83,7 +83,7 @@ mod tests {
         check(
             r#"
 -module(foo).
-bar() -> ?L~INE.
+-bar() -> ?L~INE.
 "#,
             expect![[r#"
                 LINE
@@ -97,7 +97,7 @@ bar() -> ?L~INE.
         check(
             r#"
 -module(foo).
-bar() -> ?F~ILE.
+-bar() -> ?F~ILE.
 "#,
             expect![[r#"
                 FILE
@@ -420,7 +420,7 @@ baz() ->
                             maps:get(type, ExpectedQr, missing_expected_type);
                         _ ->
                             Type
-                    end
+                    end,
 ).
 baz() ->
     ?asser~tQrs(AliceWID, ?WA_QR_TYPE_MESSAGE, []),
diff --git a/crates/ide/src/inlay_hints/param_name.rs b/crates/ide/src/inlay_hints/param_name.rs
index 88a95e86d7..cf16198dfe 100644
--- a/crates/ide/src/inlay_hints/param_name.rs
+++ b/crates/ide/src/inlay_hints/param_name.rs
@@ -259,7 +259,6 @@ main() ->
     fn param_hints_variables_missing_param() {
         check_params(
             r#"
-//- expect_parse_errors
 -module(main).~
 -compile(export_all).
 sum(A, B) -> A + B.
diff --git a/crates/ide/src/lib.rs b/crates/ide/src/lib.rs
index ad5c1bb680..dcaff6de70 100644
--- a/crates/ide/src/lib.rs
+++ b/crates/ide/src/lib.rs
@@ -110,7 +110,7 @@ pub mod diagnostics;
 pub mod diagnostics_collection;
 pub mod diff;
 mod highlight_related;
-// @fb-only: pub mod meta_only;
+// @fb-only
 
 pub use annotations::Annotation;
 pub use annotations::AnnotationKind;
@@ -251,9 +251,9 @@ impl Analysis {
         })
     }
 
-    pub fn should_eqwalize(&self, file_id: FileId) -> Cancellable<bool> {
+    pub fn should_eqwalize(&self, file_id: FileId, include_tests: bool) -> Cancellable<bool> {
         let is_in_app = self.file_app_type(file_id).ok() == Some(Some(AppType::App));
-        Ok(is_in_app && self.is_eqwalizer_enabled(file_id)?)
+        Ok(is_in_app && self.is_eqwalizer_enabled(file_id, include_tests)?)
     }
 
     /// Computes the set of eqwalizer diagnostics for the given files,
@@ -383,8 +383,8 @@ impl Analysis {
     /// - the app (the module belongs to) has `.eqwalizer` marker in the roof
     /// - or the module has `-typing([eqwalizer]).` pragma
     /// - or the whole project has `enable_all=true` in its `.elp.toml` file
-    pub fn is_eqwalizer_enabled(&self, file_id: FileId) -> Cancellable<bool> {
-        self.with_db(|db| db.is_eqwalizer_enabled(file_id))
+    pub fn is_eqwalizer_enabled(&self, file_id: FileId, include_tests: bool) -> Cancellable<bool> {
+        self.with_db(|db| db.is_eqwalizer_enabled(file_id, include_tests))
     }
 
     /// ETF for the module's abstract forms
diff --git a/crates/ide/src/rename.rs b/crates/ide/src/rename.rs
index ee5bfb7219..0cedbe1d90 100644
--- a/crates/ide/src/rename.rs
+++ b/crates/ide/src/rename.rs
@@ -194,53 +194,35 @@ pub fn rename_var(
 
 #[cfg(test)]
 pub(crate) mod tests {
-
     use elp_ide_db::RootDatabase;
-    use elp_ide_db::elp_base_db::AnchoredPathBuf;
-    use elp_ide_db::elp_base_db::FileId;
-    use elp_ide_db::elp_base_db::VfsPath;
     use elp_ide_db::elp_base_db::assert_eq_text;
-    use elp_ide_db::elp_base_db::fixture::ChangeFixture;
     use elp_ide_db::elp_base_db::fixture::WithFixture as _;
-    use elp_ide_db::source_change::FileSystemEdit;
     use elp_ide_db::text_edit::TextEdit;
     use elp_project_model::test_fixture::trim_indent;
     use elp_syntax::AstNode;
     use elp_syntax::algo;
     use elp_syntax::ast;
-    use fxhash::FxHashSet;
     use hir::AnyExprId;
     use hir::InFile;
     use hir::Semantic;
 
     use super::rename_var;
-    use crate::AnalysisHost;
     use crate::fixture;
 
     #[track_caller]
     pub(crate) fn check_rename(new_name: &str, fixture_before: &str, fixture_after_str: &str) {
         let fixture_after_str = &trim_indent(fixture_after_str);
+        let analysis_after = fixture::multi_file(fixture_after_str);
 
-        let (db_before, fixture) = RootDatabase::with_fixture(fixture_before);
-        let host_before = AnalysisHost { db: db_before };
-        let analysis = host_before.analysis();
-        let position = fixture.position();
-
-        let (db_after, fixture_after) = RootDatabase::with_fixture(fixture_after_str);
-        let host_after = AnalysisHost { db: db_after };
-        let analysis_after = host_after.analysis();
-
+        let (analysis, position, _) = fixture::position(fixture_before);
         let rename_result = analysis
             .rename(position, new_name)
             .unwrap_or_else(|err| panic!("Rename to '{new_name}' was cancelled: {err}"));
         match rename_result {
             Ok(source_change) => {
-                let mut file_ids: FxHashSet<FileId> = FxHashSet::default();
                 for edit in source_change.source_file_edits {
                     let mut text_edit_builder = TextEdit::builder();
                     let file_id = edit.0;
-                    // New and old file_id are the same
-                    file_ids.insert(file_id);
                     for indel in edit.1.into_iter() {
                         text_edit_builder.replace(indel.delete, indel.insert);
                     }
@@ -250,82 +232,6 @@ pub(crate) mod tests {
                     let expected = analysis_after.file_text(file_id).unwrap().to_string();
                     assert_eq_text!(&*expected, &*result);
                 }
-                for op in source_change.file_system_edits {
-                    let expected;
-                    let new_file_id;
-                    match op {
-                        FileSystemEdit::CreateFile {
-                            dst,
-                            initial_contents,
-                        } => {
-                            let new_file =
-                                find_new_file_id(&fixture_after, &dst).unwrap_or_else(|| {
-                                    panic!(
-                                        "Fixture after:could not find file created as '{}'",
-                                        &dst.path
-                                    )
-                                });
-                            new_file_id = *new_file.1;
-                            expected = initial_contents;
-                            let actual = analysis_after.file_text(new_file_id).unwrap().to_string();
-                            assert_eq_text!(&*expected, &*actual);
-                        }
-                        FileSystemEdit::MoveFile { src: _, dst } => {
-                            let new_file =
-                                find_new_file_id(&fixture_after, &dst).unwrap_or_else(|| {
-                                    panic!(
-                                        "Fixture after:could not find file renamed to '{}'",
-                                        &dst.path
-                                    )
-                                });
-                            new_file_id = *new_file.1;
-                            // We simply record the new file id for checking in `fixture_after``.
-                            // The expected value will be updated by the new_file_edits below,
-                            // and the result asserted there
-                        }
-                    }
-                    file_ids.insert(new_file_id);
-                }
-                for (dst, op) in source_change.new_file_edits {
-                    // When renaming a module, we move the original file, then apply fixup edits
-                    // to the new file
-                    let anchored_dst = AnchoredPathBuf {
-                        anchor: dst.anchor,
-                        path: dst.path,
-                    };
-                    let new_file =
-                        find_new_file_id(&fixture_after, &anchored_dst).unwrap_or_else(|| {
-                            panic!(
-                                "Fixture after:could not find file created as '{}'",
-                                &anchored_dst.path
-                            )
-                        });
-
-                    let mut text_edit_builder = TextEdit::builder();
-                    let file_id = *new_file.1;
-                    // New and old file_id are the same
-                    file_ids.insert(file_id);
-                    for indel in op.iter() {
-                        text_edit_builder.replace(indel.delete, indel.insert.to_string());
-                    }
-                    let mut result = analysis.file_text(file_id).unwrap().to_string();
-                    let edit = text_edit_builder.finish();
-                    edit.apply(&mut result);
-                    let expected = analysis_after.file_text(file_id).unwrap().to_string();
-                    assert_eq_text!(&*expected, &*result);
-                }
-                // Check the balance of the expectations in the new fixture.
-                for file_id in &fixture_after.files {
-                    if !file_ids.contains(file_id) {
-                        let actual = analysis_after.file_text(*file_id).unwrap().to_string();
-                        let expected = if fixture.files.contains(file_id) {
-                            analysis.file_text(*file_id).unwrap().to_string()
-                        } else {
-                            format!("File {:?} not present in original fixture", file_id)
-                        };
-                        assert_eq_text!(&*expected, &*actual);
-                    }
-                }
             }
             Err(err) => {
                 if fixture_after_str.starts_with("error:") {
@@ -341,16 +247,6 @@ pub(crate) mod tests {
         };
     }
 
-    fn find_new_file_id<'a>(
-        fixture: &'a ChangeFixture,
-        dst: &'a AnchoredPathBuf,
-    ) -> Option<(&'a VfsPath, &'a FileId)> {
-        fixture
-            .files_by_path
-            .iter()
-            .find(|(name, _)| name.as_path().unwrap().to_string().ends_with(&dst.path))
-    }
-
     #[test]
     fn test_rename_var_1() {
         check_rename("Y", r#"main() -> I~ = 1."#, r#"main() -> Y = 1."#);
@@ -1239,326 +1135,6 @@ pub(crate) mod tests {
         );
     }
 
-    // ---------------------------------
-    // Renaming modules
-
-    #[test]
-    fn rename_module_fails_name_exists() {
-        check_rename(
-            "main_2",
-            r#"
-            //- /app_a/src/main.erl
-            -module(ma~in).
-            //- /app_a_/src/main_2.erl
-            -module(main_2).
-             "#,
-            r#"error: module 'main_2' already exists"#,
-        );
-    }
-
-    #[test]
-    fn rename_module_fails_bad_name_1() {
-        check_rename(
-            "Main",
-            r#"
-            //- /app_a/src/main.erl
-            -module(ma~in).
-            //- /app_a_/src/main_2.erl
-            -module(main_2).
-             "#,
-            r#"error: Invalid new module name: 'Main'"#,
-        );
-    }
-
-    #[test]
-    fn rename_module_simple() {
-        check_rename(
-            "main_2",
-            r#"
-            //- /app_a/src/main.erl
-            -module(ma~in).
-             "#,
-            r#"
-            //- /app_a/src/main_2.erl
-            -module(main_2).
-             "#,
-        );
-    }
-
-    #[test]
-    fn rename_module_fails_dup_name() {
-        check_rename(
-            "main_2",
-            r#"
-            //- /app_a/src/main_2.erl
-            -module(main_2).
-            -export([foo/0]).
-            foo() -> ok.
-            //- /app_a/src/main.erl
-              -module(ma~in).
-              -export([foo/0]).
-              foo() -> ok.
-              bar() -> main:foo().
-              baz() -> main:bar().
-
-            //- /app_a/src/other.erl
-            -module(other).
-            -export([bar/0]).
-            bar() -> main:foo().
-            "#,
-            r#"error: module 'main_2' already exists"#,
-        );
-    }
-
-    #[test]
-    fn rename_module_with_usage_internal() {
-        check_rename(
-            "main_2",
-            r#"
-            //- /app_a/src/main.erl
-              -module(ma~in).
-              -export([foo/0]).
-              foo() -> ok.
-              bar() -> main:foo().
-              baz() -> main:bar().
-
-            //- /app_a/src/other.erl
-            -module(other).
-            -export([bar/0]).
-            bar() -> main:foo().
-            "#,
-            //------------------
-            r#"
-            //- /app_a/src/main_2.erl
-              -module(main_2).
-              -export([foo/0]).
-              foo() -> ok.
-              bar() -> main_2:foo().
-              baz() -> main_2:bar().
-
-            //- /app_a/src/other.erl
-            -module(other).
-            -export([bar/0]).
-            bar() -> main_2:foo().
-            "#,
-        );
-    }
-    #[test]
-    fn rename_module_with_usage_type() {
-        // TODO: check for compile errors in the fixture
-        check_rename(
-            "main_3",
-            r#"
-            //- /app_a/src/main.erl
-              -module(ma~in).
-              -export_type([foo/0]).
-              -type foo() :: ok.
-            //- /app_a/src/other.erl
-              -module(other).
-              -export([bar/0]).
-              -spec bar() -> main:foo().
-              bar() -> ok.
-             "#,
-            r#"
-            //- /app_a/src/main_3.erl
-              -module(main_3).
-              -export_type([foo/0]).
-              -type foo() :: ok.
-            //- /app_a/src/other.erl
-              -module(other).
-              -export([bar/0]).
-              -spec bar() -> main_3:foo().
-              bar() -> ok.
-             "#,
-        );
-    }
-
-    #[test]
-    fn rename_module_with_usage_record() {
-        check_rename(
-            "main_3",
-            r#"
-            //- /app_a/src/main.erl
-              -module(ma~in).
-              -export_type([foo/0]).
-              -type foo() :: ok.
-            //- /app_a/src/other.erl
-              -module(other).
-              -export([bar/0]).
-              -spec bar() -> main:foo().
-              bar() -> ok.
-              -record(main, {field :: main:foo()}).
-             "#,
-            //------------------
-            r#"
-            //- /app_a/src/main_3.erl
-              -module(main_3).
-              -export_type([foo/0]).
-              -type foo() :: ok.
-            //- /app_a/src/other.erl
-              -module(other).
-              -export([bar/0]).
-              -spec bar() -> main_3:foo().
-              bar() -> ok.
-              -record(main, {field :: main_3:foo()}).
-             "#,
-        );
-    }
-
-    #[test]
-    fn rename_module_with_usage_fun_arg() {
-        check_rename(
-            "main_3",
-            r#"
-            //- /app_a/src/main.erl
-              -module(ma~in).
-              -export_type([foo/0]).
-              -type foo() :: ok.
-            //- /app_a/src/other.erl
-              -module(other).
-              -export([bar/0]).
-              -spec bar() -> main:foo().
-              bar() ->
-               meck:new(main, [passthrough]),
-               meck:new([other, main] , [passthrough]),
-               meck:unload(main),
-               apply(main, foo, []),
-               ok.
-              -record(main, {field :: main:foo()}).
-             "#,
-            //------------------
-            r#"
-            //- /app_a/src/main_3.erl
-              -module(main_3).
-              -export_type([foo/0]).
-              -type foo() :: ok.
-            //- /app_a/src/other.erl
-              -module(other).
-              -export([bar/0]).
-              -spec bar() -> main_3:foo().
-              bar() ->
-               meck:new(main_3, [passthrough]),
-               meck:new([other, main_3] , [passthrough]),
-               meck:unload(main_3),
-               apply(main_3, foo, []),
-               ok.
-              -record(main, {field :: main_3:foo()}).
-             "#,
-        );
-    }
-
-    #[test]
-    fn rename_module_with_usage_fun() {
-        check_rename(
-            "main_3",
-            r#"
-            //- /app_a/src/main.erl
-              -module(ma~in).
-              -export([foo/1]).
-              foo(X) -> {X}.
-            //- /app_a/src/other.erl
-              -module(other).
-              -export([bar/1]).
-              -spec bar(term()) -> ok.
-              bar(UStrings) ->
-                Jobs = [{fun main:foo/1, [U], []} || U <- UStrings],
-                ok.
-             "#,
-            r#"
-            //- /app_a/src/main_3.erl
-              -module(main_3).
-              -export([foo/1]).
-              foo(X) -> {X}.
-            //- /app_a/src/other.erl
-              -module(other).
-              -export([bar/1]).
-              -spec bar(term()) -> ok.
-              bar(UStrings) ->
-                Jobs = [{fun main_3:foo/1, [U], []} || U <- UStrings],
-                ok.
-             "#,
-        );
-    }
-
-    #[test]
-    fn rename_module_with_usage_fun_as_module() {
-        check_rename(
-            "main_3",
-            r#"
-            //- /app_a/src/main.erl
-              -module(ma~in).
-              -export([main/1]).
-              main(X) -> {X}.
-            //- /app_a/src/other.erl
-              -module(other).
-              -export([bar/1]).
-              -spec bar(term()) -> ok.
-              bar(UStrings) ->
-                Jobs = [{fun main:main/1, [U], []} || U <- UStrings],
-                ok.
-             "#,
-            r#"
-            //- /app_a/src/main_3.erl
-              -module(main_3).
-              -export([main/1]).
-              main(X) -> {X}.
-            //- /app_a/src/other.erl
-              -module(other).
-              -export([bar/1]).
-              -spec bar(term()) -> ok.
-              bar(UStrings) ->
-                Jobs = [{fun main_3:main/1, [U], []} || U <- UStrings],
-                ok.
-             "#,
-        );
-    }
-
-    #[test]
-    fn rename_module_with_usage_define() {
-        check_rename(
-            "main_3",
-            r#"
-            //- /app_a/src/main.erl
-              -module(ma~in).
-              -export([foo/1]).
-              foo(X) -> {X}.
-
-            //- /app_a/src/definer.hrl
-              -define(FOO(X), main:foo(X)).
-
-            //- /app_a/src/other.erl
-              -module(other).
-              -include("definer.hrl").
-              -export([bar/0]).
-              -spec bar(term()) -> ok.
-              bar(U) ->
-                main:foo(U),
-                ?FOO(U),
-                ok.
-             "#,
-            //------------------
-            r#"
-            //- /app_a/src/main_3.erl
-              -module(main_3).
-              -export([foo/1]).
-              foo(X) -> {X}.
-
-            //- /app_a/src/definer.hrl
-              -define(FOO(X), main_3:foo(X)).
-
-            //- /app_a/src/other.erl
-              -module(other).
-              -include("definer.hrl").
-              -export([bar/0]).
-              -spec bar(term()) -> ok.
-              bar(U) ->
-                main_3:foo(U),
-                ?FOO(U),
-                ok.
-             "#,
-        );
-    }
-
     // ---------------------------------
 
     #[track_caller]
diff --git a/crates/ide/src/runnables.rs b/crates/ide/src/runnables.rs
index 0aa731c8c9..4b2348f610 100644
--- a/crates/ide/src/runnables.rs
+++ b/crates/ide/src/runnables.rs
@@ -243,7 +243,7 @@ mod tests {
  //- /my_app/src/runnables.erl
     ~
     -module(runnables).
-    -export([all/0]).
+    -export([all/]).
     main() ->
       ok.
     "#,
diff --git a/crates/ide/src/signature_help.rs b/crates/ide/src/signature_help.rs
index d09ec201f8..fba6d12d73 100644
--- a/crates/ide/src/signature_help.rs
+++ b/crates/ide/src/signature_help.rs
@@ -311,7 +311,6 @@ mod tests {
     fn test_fn_signature_local_two_args() {
         check(
             r#"
-//- expect_parse_errors
 -module(main).
 
 -spec add(integer(), integer()) -> integer().
@@ -344,7 +343,6 @@ main() ->
         );
         check(
             r#"
-//- expect_parse_errors
 -module(main).
 
 -spec add(integer(), integer()) -> integer().
@@ -377,7 +375,6 @@ main() ->
         );
         check(
             r#"
-//- expect_parse_errors
 -module(main).
 
 -spec add(integer(), integer()) -> integer().
@@ -414,7 +411,6 @@ main() ->
     fn test_fn_signature_remote_two_args() {
         check(
             r#"
-//- expect_parse_errors
 //- /one.erl
 -module(one).
 
@@ -453,7 +449,6 @@ main() ->
         );
         check(
             r#"
-//- expect_parse_errors
 //- /one.erl
 -module(one).
 
@@ -492,7 +487,6 @@ main() ->
         );
         check(
             r#"
-//- expect_parse_errors
 //- /one.erl
 -module(one).
 
@@ -535,7 +529,6 @@ main() ->
     fn test_fn_signature_quoted_remote_two_args() {
         check(
             r#"
-//- expect_parse_errors
 //- /Elixir.One.erl
 -module('Elixir.One').
 
@@ -583,7 +576,6 @@ main() ->
     fn test_fn_signature_unclosed_call() {
         check(
             r#"
-//- expect_parse_errors
 -module(main).
 
 -compile(export_all).
@@ -634,7 +626,6 @@ main() ->
     fn test_fn_signature_doc() {
         check(
             r#"
-//- expect_parse_errors
 -module(main).
 
 -compile(export_all).
@@ -694,7 +685,6 @@ main() ->
         if supports_eep59_doc_attributes() {
             check(
                 r#"
-//- expect_parse_errors
 -module(main).
 
 -compile(export_all).
@@ -763,7 +753,6 @@ main() ->
     fn test_fn_signature_local_imported() {
         check(
             r#"
-//- expect_parse_errors
 //- /one.erl
 -module(one).
 -compile(export_all).
@@ -805,7 +794,6 @@ main() ->
     fn test_fn_signature_spec_arg_names() {
         check(
             r#"
-//- expect_parse_errors
 //- /one.erl
 -module(one).
 -compile(export_all).
diff --git a/crates/ide/src/tests.rs b/crates/ide/src/tests.rs
index 55e9494e48..86f0a57555 100644
--- a/crates/ide/src/tests.rs
+++ b/crates/ide/src/tests.rs
@@ -378,7 +378,6 @@ pub(crate) fn check_diagnostics(fixture: &str) {
         .disable(DiagnosticCode::UnspecificInclude)
         .disable(DiagnosticCode::BinaryStringToSigil)
         .disable(DiagnosticCode::HirUnresolvedMacro)
-        .disable(DiagnosticCode::BoundVarInLhs)
         .disable(DiagnosticCode::HirUnresolvedInclude);
     check_diagnostics_with_config(config, fixture)
 }
@@ -696,7 +695,6 @@ mod test {
     fn filtered_diagnostics_passes_syntax_errors() {
         check_filtered_diagnostics(
             r#"
-            //- expect_parse_errors
             %%<^^^^^^^^^^^^ 💡 error: L1201: no module definition
             foo() ->
                bug bug.
diff --git a/crates/ide_completion/src/attributes.rs b/crates/ide_completion/src/attributes.rs
index f381df147d..fc97832d30 100644
--- a/crates/ide_completion/src/attributes.rs
+++ b/crates/ide_completion/src/attributes.rs
@@ -166,7 +166,6 @@ mod test {
     fn test_error_recovery() {
         check(
             r#"
-            //- expect_parse_errors
             //- /src/sample.erl
             -module(sample1).
             % U.S. English
@@ -181,7 +180,6 @@ mod test {
 
         check(
             r#"
-            //- expect_parse_errors
             //- /src/sample.erl
             -module(sample1).
             % U.K. English
@@ -199,7 +197,6 @@ mod test {
     fn test_typing_attribute() {
         check(
             r#"
-        //- expect_parse_errors
         -module(sample).
         -typ~
         "#,
@@ -214,7 +211,6 @@ mod test {
     fn test_module_attribute() {
         check(
             r#"
-        //- expect_parse_errors
         -mod~
         "#,
             None,
@@ -228,7 +224,6 @@ mod test {
     fn test_module_attribute_hyphen() {
         check(
             r#"
-        //- expect_parse_errors
         //- /src/my-module.erl
         -mod~
         "#,
@@ -243,7 +238,6 @@ mod test {
     fn test_module_attribute_at() {
         check(
             r#"
-        //- expect_parse_errors
         //- /src/my@module.erl
         -mod~
         "#,
@@ -258,7 +252,6 @@ mod test {
     fn test_module_attribute_underscore() {
         check(
             r#"
-        //- expect_parse_errors
         //- /src/my_module.erl
         -mod~
         "#,
@@ -273,7 +266,6 @@ mod test {
     fn test_module_attribute_uppercase() {
         check(
             r#"
-        //- expect_parse_errors
         //- /src/Module.erl
         -mod~
         "#,
@@ -288,7 +280,6 @@ mod test {
     fn test_module_attribute_uppercase_middle() {
         check(
             r#"
-        //- expect_parse_errors
         //- /src/moDule.erl
         -mod~
         "#,
diff --git a/crates/ide_completion/src/ctx.rs b/crates/ide_completion/src/ctx.rs
index 0d9381e7ec..22e385e3fa 100644
--- a/crates/ide_completion/src/ctx.rs
+++ b/crates/ide_completion/src/ctx.rs
@@ -281,7 +281,6 @@ mod ctx_tests {
     fn expr_ctx() {
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test() ->
             ~X.
@@ -291,7 +290,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test() ->
             case 1 of.
@@ -303,7 +301,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test() ->
             fun(_) -> ~X end.
@@ -313,7 +310,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test() ->
             try 1
@@ -357,7 +353,6 @@ mod ctx_tests {
     fn ctx_pattern() {
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test(Y, X) ->
             ~Y = X.
@@ -367,7 +362,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test(X) ->
             case rand:uniform(1) of
@@ -379,7 +373,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test(X) ->
             fun(X~) -> 1 end.
@@ -389,7 +382,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test() ->
             receive
@@ -401,7 +393,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test() ->
             try [1]
@@ -416,7 +407,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test(X) ->
             if
@@ -439,7 +429,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test(Y, X) ->
             try ok of
@@ -451,7 +440,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test(Y, X) ->
             try ok of
@@ -469,7 +457,6 @@ mod ctx_tests {
     fn ctx_pattern_error_recovery_wip() {
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test(Y, X) ->
             try ok of
@@ -482,7 +469,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test(Y, X) ->
             try ok of
@@ -499,7 +485,6 @@ mod ctx_tests {
     fn test_type_param_ctx() {
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         -type ty(s~) :: ok.
         "#),
@@ -511,7 +496,6 @@ mod ctx_tests {
     fn test_export_ctx() {
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         -export([
             f~
@@ -525,7 +509,6 @@ mod ctx_tests {
     fn test_export_type_ctx() {
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         -export_type([
             t~
@@ -539,7 +522,6 @@ mod ctx_tests {
     fn test_spec_ctx() {
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         -spec t~
         table() -> ok.
@@ -553,7 +535,6 @@ mod ctx_tests {
     fn test_type_ctx() {
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         -spec test() -> ~
         test() -> ok.
@@ -563,7 +544,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         -spec test() -> o~k
         test() -> ok.
@@ -573,7 +553,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         -spec test(o~) -> ok.
         test() -> ok.
@@ -583,7 +562,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         -record(foo, {field1, field2 :: X~}).
         "#),
@@ -592,7 +570,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         -opaque test() :: ~.
         "#),
@@ -601,7 +578,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         -nominal test() :: ~.
         "#),
@@ -610,7 +586,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         -type test() :: m~
         "#),
@@ -619,7 +594,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         -spec test() -> ~ok.
         "#),
@@ -631,7 +605,6 @@ mod ctx_tests {
     fn test_ctx_error_recovery() {
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test() ->
             ~
@@ -641,7 +614,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test() ->
             X + ~
@@ -651,7 +623,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test() ->
             X + ~.
@@ -661,7 +632,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test() ->
             case rand:uniform(1) of
@@ -673,7 +643,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test() ->
             (erlang:term_to_binary(~
@@ -684,7 +653,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         test() ->
             (erlang:term_to_binary(~.
@@ -695,7 +663,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         -type ty() :: ~
         "#),
@@ -704,7 +671,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         -type ty() :: l~.
         "#),
@@ -713,7 +679,6 @@ mod ctx_tests {
 
         assert_eq!(
             ctx(r#"
-        //- expect_parse_errors
         -module(sample).
         -record(rec, {field = lists:map(fun(X) -> X + 1 end, [1, ~])}).
         "#),
diff --git a/crates/ide_completion/src/export_functions.rs b/crates/ide_completion/src/export_functions.rs
index ef803eb9ab..f362ea830a 100644
--- a/crates/ide_completion/src/export_functions.rs
+++ b/crates/ide_completion/src/export_functions.rs
@@ -83,7 +83,6 @@ mod test {
 
         check(
             r#"
-        //- expect_parse_errors
         -module(sample).
         -export([
             foo~
@@ -107,7 +106,6 @@ mod test {
 
         check(
             r#"
-        //- expect_parse_errors
         -module(sample).
         -export([
             function_a/0,
diff --git a/crates/ide_completion/src/export_types.rs b/crates/ide_completion/src/export_types.rs
index c21a37339e..9e80828b66 100644
--- a/crates/ide_completion/src/export_types.rs
+++ b/crates/ide_completion/src/export_types.rs
@@ -79,7 +79,6 @@ mod test {
 
         check(
             r#"
-        //- expect_parse_errors
         -module(sample).
         -export_type([
             foo~
diff --git a/crates/ide_completion/src/functions.rs b/crates/ide_completion/src/functions.rs
index eab033765f..4ce641d0e9 100644
--- a/crates/ide_completion/src/functions.rs
+++ b/crates/ide_completion/src/functions.rs
@@ -243,7 +243,6 @@ mod test {
 
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     local() ->
@@ -266,7 +265,6 @@ mod test {
 
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     local() ->
@@ -340,7 +338,6 @@ mod test {
 
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     local() ->
@@ -363,7 +360,6 @@ mod test {
 
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     local() ->
@@ -383,14 +379,12 @@ mod test {
                 {label:foon/2, kind:Function, contents:Snippet("foon(${1:A}, ${2:B})"), position:Some(FilePosition { file_id: FileId(1), offset: 86 })}"#]],
         );
     }
-
     #[test]
     fn test_remote_calls_deprecated() {
         assert!(serde_json::to_string(&lsp_types::CompletionItemKind::MODULE).unwrap() == "9");
 
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     local() ->
@@ -419,7 +413,6 @@ mod test {
 
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     local() ->
@@ -448,7 +441,6 @@ mod test {
 
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     local() ->
@@ -474,7 +466,6 @@ mod test {
 
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     local() ->
@@ -593,7 +584,6 @@ mod test {
     fn test_remote_fun_exprs_with_trigger() {
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     main(_) ->
@@ -617,7 +607,6 @@ mod test {
     fn test_local_fun_exprs_with_trigger() {
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     foo() -> ok.
@@ -633,7 +622,6 @@ mod test {
     fn test_local_fun_exprs_no_trigger() {
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     foo() -> ok.
@@ -649,7 +637,6 @@ mod test {
     fn function_error_recovery() {
         check(
             r#"
-    //- expect_parse_errors
     -module(sample1).
     foo() ->
         b~
@@ -663,7 +650,6 @@ mod test {
         );
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     local() ->
@@ -682,7 +668,6 @@ mod test {
     fn test_local_and_remote() {
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     samba() -> ok.
@@ -703,7 +688,6 @@ mod test {
     fn test_remote_call_broken_case() {
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     test() ->
@@ -725,7 +709,6 @@ mod test {
     fn test_local_call_broken_case() {
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     foo() -> ok.
@@ -819,7 +802,6 @@ mod test {
 
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     local() ->
@@ -838,7 +820,6 @@ mod test {
         );
         check(
             r#"
-//- expect_parse_errors
 //- /src/sample1.erl
 -module(sample1).
 local() ->
@@ -858,7 +839,6 @@ foo(X, Y) -> ok.
         );
         check(
             r#"
-//- expect_parse_errors
 //- /src/sample1.erl
 -module(sample1).
 local() ->
@@ -922,7 +902,6 @@ foo(X, Y) -> ok.
     fn test_remote_call_same_module_macro_prefix() {
         check(
             r#"
-    //- expect_parse_errors
     -module(main).
     -export([main/0, do_not_use_me/0]).
     -deprecated({do_not_use_me, 0, "Because I said so"}).
@@ -943,7 +922,6 @@ foo(X, Y) -> ok.
     fn test_in_dialyzer_attribute() {
         check(
             r#"
-    //- expect_parse_errors
     -module(main).
     -export([
         foo/1,
@@ -964,7 +942,6 @@ foo(X, Y) -> ok.
     fn test_quoted_local_call() {
         check(
             r#"
-    //- expect_parse_errors
     -module(sample).
     test() ->
         fo~(something).
diff --git a/crates/ide_completion/src/keywords.rs b/crates/ide_completion/src/keywords.rs
index dc60ae8158..734afc80a5 100644
--- a/crates/ide_completion/src/keywords.rs
+++ b/crates/ide_completion/src/keywords.rs
@@ -141,7 +141,6 @@ mod test {
     fn test_no_keywords() {
         check(
             r#"
-    //- expect_parse_errors
     -module(sample).
     test(X) ->
         a~
@@ -151,7 +150,6 @@ mod test {
         );
         check(
             r#"
-    //- expect_parse_errors
     -module(sample).
     test(~X) ->
         X.
@@ -162,7 +160,6 @@ mod test {
 
         check(
             r#"
-    //- expect_parse_errors
     -module(m~).
     "#,
             None,
@@ -171,7 +168,6 @@ mod test {
 
         check(
             r#"
-    //- expect_parse_errors
     -module(m).
     -~
     "#,
@@ -181,7 +177,6 @@ mod test {
 
         check(
             r#"
-    //- expect_parse_errors
     -module(m).
     -type foo() :: ~.
     "#,
@@ -196,7 +191,6 @@ mod test {
     fn test_keywords_error_recovery() {
         check(
             r#"
-    //- expect_parse_errors
     -module(sample).
     test(X) ->
         X ~
@@ -240,7 +234,6 @@ mod test {
 
         check(
             r#"
-    //- expect_parse_errors
     -module(sample).
     test(X) ->
         ~
diff --git a/crates/ide_completion/src/lib.rs b/crates/ide_completion/src/lib.rs
index f41aecdd67..71b4ff02c0 100644
--- a/crates/ide_completion/src/lib.rs
+++ b/crates/ide_completion/src/lib.rs
@@ -40,7 +40,7 @@ mod helpers;
 mod keywords;
 mod macros;
 mod maps;
-// @fb-only: mod meta_only;
+// @fb-only
 mod modules;
 mod records;
 mod spec;
@@ -176,7 +176,7 @@ pub fn completions(
         }
         CtxKind::Other => {
             let _ = attributes::add_completions(&mut acc, ctx)
-                // @fb-only: || meta_only::add_completions(&mut acc, ctx)
+                // @fb-only
                 || vars::add_completions(&mut acc, ctx)
                 || maps::add_completions(&mut acc, ctx)
                 || records::add_completions(&mut acc, ctx);
diff --git a/crates/ide_completion/src/macros.rs b/crates/ide_completion/src/macros.rs
index e86cf3ba93..3c4b77cfad 100644
--- a/crates/ide_completion/src/macros.rs
+++ b/crates/ide_completion/src/macros.rs
@@ -253,7 +253,6 @@ mod test {
 
         check(
             r#"
-    //- expect_parse_errors
     -module(sample1).
     -define(FOO, 1).
     -define(FOO(), 1).
@@ -272,7 +271,6 @@ mod test {
 
         check(
             r#"
-    //- expect_parse_errors
     -module(sample1).
     -define(FOO, 1).
     -define(BAR, 1).
@@ -284,7 +282,6 @@ mod test {
 
         check(
             r#"
-    //- expect_parse_errors
     -module(sample1).
     -define(FOO, ok).
     -define(BAR, 1).
diff --git a/crates/ide_completion/src/maps.rs b/crates/ide_completion/src/maps.rs
index e232a7d8bc..4371793356 100644
--- a/crates/ide_completion/src/maps.rs
+++ b/crates/ide_completion/src/maps.rs
@@ -214,7 +214,6 @@ mod test {
     fn test_local_type() {
         check(
             r#"
-         //- expect_parse_errors
          -module(test_local_type).
          -type my_map() :: #{field1 := integer(), field2 => boolean()}.
          foo(X) -> #~
@@ -230,7 +229,6 @@ mod test {
     fn test_included_type() {
         check(
             r#"
-         //- expect_parse_errors
          //- /include/test_included_type.hrl include_path:/include
          -type my_included_map() :: #{field1 := integer(), field2 => integer()}.
          //- /src/test_included_type.erl
@@ -252,7 +250,6 @@ mod test {
     fn test_empty_map_type() {
         check(
             r#"
-         //- expect_parse_errors
          -module(test_empty_map_type).
          -type my_map() :: #{}.
          foo(X) -> #~
@@ -268,7 +265,6 @@ mod test {
     fn test_arity_1_map_type() {
         check(
             r#"
-         //- expect_parse_errors
          -module(test_arity_1_map_type).
          -type my_map() :: #{field1 := true }.
          foo(X) -> #~
@@ -284,7 +280,6 @@ mod test {
     fn test_mixed_map_and_record_types() {
         check(
             r#"
-         //- expect_parse_errors
          -module(test_mixed_map_and_record_types).
          -type my_map() :: #{field1 := true }.
          -record(my_record, {field1}).
@@ -302,7 +297,6 @@ mod test {
     fn test_nested_map_type() {
         check(
             r#"
-         //- expect_parse_errors
          -module(test_nested_map_type).
          -type my_map() :: #{field1 := true, field2 => false}.
          -type my_nested_map() :: #{field1 := #{field1 => my_map()}}.
@@ -321,12 +315,11 @@ mod test {
     fn test_type_from_spec() {
         check(
             r#"
-         //- expect_parse_errors
          //- /src/one.erl
          -module(one).
          -type my_map(X) :: #{field1 := X}.
          -export_type([my_map/0]).
-
+         
          //- /src/two.erl
          -module(two).
          -spec foo(one:my_map(integer())) -> one:my_map(integer()).
@@ -345,12 +338,11 @@ mod test {
     fn test_type_from_unowned_spec() {
         check(
             r#"
-         //- expect_parse_errors
          //- /src/one.erl
          -module(one).
          -type my_map(X) :: #{field1 := X}.
          -export_type([my_map/0]).
-
+         
          //- /src/two.erl
          -module(two).
          -spec foo(one:my_map(integer())) -> one:my_map(integer()).
@@ -367,7 +359,6 @@ mod test {
     fn test_local_type_in_function_argument() {
         check(
             r#"
-         //- expect_parse_errors
          -module(test_local_type).
          -type my_map() :: #{field1 := integer(), field2 => boolean()}.
          foo(#~
diff --git a/crates/ide_completion/src/modules.rs b/crates/ide_completion/src/modules.rs
index 3823339f78..820d04cfe8 100644
--- a/crates/ide_completion/src/modules.rs
+++ b/crates/ide_completion/src/modules.rs
@@ -132,7 +132,6 @@ foo() ->
 
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     -export([
diff --git a/crates/ide_completion/src/records.rs b/crates/ide_completion/src/records.rs
index d66e054423..cf8e0abc7c 100644
--- a/crates/ide_completion/src/records.rs
+++ b/crates/ide_completion/src/records.rs
@@ -320,7 +320,6 @@ mod test {
     fn test_record_name() {
         check(
             r#"
-        //- expect_parse_errors
         -module(sample).
         -record(this_record, {field1=1, field2=2}).
         -record(that_record, {}).
@@ -335,7 +334,6 @@ mod test {
 
         check(
             r#"
-        //- expect_parse_errors
         -module(sample).
         -record(this_record, {field1=1, field2=2}).
         -record(that_record, {}).
@@ -355,7 +353,6 @@ mod test {
         // Irregular names are quoted.
         check(
             r#"
-        //- expect_parse_errors
         -module(sample).
         -record('this.record', {field1=1, field2=2}).
         -record('that$record', {}).
@@ -372,7 +369,6 @@ mod test {
     fn test_record_error_recovery() {
         check(
             r#"
-        //- expect_parse_errors
         -module(sample).
         -record(rec, {field1=1, field2=2}).
         foo(X) -> #rec{field1 = 1, field2~.
@@ -385,7 +381,6 @@ mod test {
 
         check(
             r#"
-        //- expect_parse_errors
         -module(sample).
         -record(rec, {field1=1, field2=2}).
         foo(X) -> X#rec{field1 = 1, field2~.
@@ -398,7 +393,6 @@ mod test {
 
         check(
             r#"
-        //- expect_parse_errors
         -module(sample).
         -record(rec, {field1=1, field2=2}).
         foo(X) -> case ok of
@@ -410,7 +404,6 @@ mod test {
 
         check(
             r#"
-        //- expect_parse_errors
         -module(sample).
         -record(rec, {field1=1, field2=2}).
         foo(X) -> case ok of
@@ -424,7 +417,6 @@ mod test {
 
         check(
             r#"
-        //- expect_parse_errors
         -module(sample).
         -record(rec, {field1=1, field2=2}).
         foo(X) -> case ok of
@@ -441,7 +433,6 @@ mod test {
     fn test_record_name_in_function_signature() {
         check(
             r#"
-        //- expect_parse_errors
         -module(sample).
         -record(this_record, {field1=1, field2=2}).
         -record(that_record, {}).
@@ -459,7 +450,6 @@ mod test {
     fn test_record_field_in_function_signature() {
         check(
             r#"
-        //- expect_parse_errors
         -module(sample).
         -record(rec, {field1, field2, other}).
         foo(#rec{fie~
diff --git a/crates/ide_completion/src/spec.rs b/crates/ide_completion/src/spec.rs
index cc853af865..6a0061e914 100644
--- a/crates/ide_completion/src/spec.rs
+++ b/crates/ide_completion/src/spec.rs
@@ -109,7 +109,6 @@ mod test {
 
         check(
             r#"
-        //- expect_parse_errors
         -module(sample).
 
         frog() -> ok.
@@ -130,7 +129,6 @@ mod test {
 
         check(
             r#"
-        //- expect_parse_errors
         -module(sample).
 
         frog(A, B) -> {A, B}.
diff --git a/crates/ide_completion/src/types.rs b/crates/ide_completion/src/types.rs
index e232ab2944..3800a97b5c 100644
--- a/crates/ide_completion/src/types.rs
+++ b/crates/ide_completion/src/types.rs
@@ -169,7 +169,6 @@ mod test {
 
         check(
             r#"
-        //- expect_parse_errors
         //- /src/sample.erl
         -module(sample).
         -type alias() :: ok.
@@ -198,7 +197,6 @@ mod test {
 
         check(
             r#"
-        //- expect_parse_errors
         //- /src/sample.erl
         -module(sample).
         -type alias() :: ok.
@@ -227,7 +225,6 @@ mod test {
 
         check(
             r#"
-        //- expect_parse_errors
         //- /src/sample.erl
         -module(sample).
         -spec foo() -> sample2:~.
@@ -251,7 +248,6 @@ mod test {
         // something reasonable (show nothing)
         check(
             r#"
-        //- expect_parse_errors
         //- /src/sample.erl
         -module(sample).
         -spec foo() -> sample~:.
@@ -267,7 +263,6 @@ mod test {
 
         check(
             r#"
-        //- expect_parse_errors
         //- /src/sample.erl
         -module(sample).
         -spec foo() -> sample~:.
diff --git a/crates/ide_completion/src/vars.rs b/crates/ide_completion/src/vars.rs
index 5544475ed3..65740d56a4 100644
--- a/crates/ide_completion/src/vars.rs
+++ b/crates/ide_completion/src/vars.rs
@@ -100,7 +100,6 @@ mod test {
     fn test_local_variables_1() {
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     test(AnArg1,Blah) ->
@@ -118,7 +117,6 @@ mod test {
     fn test_local_variables_limit_to_current_function() {
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     another(AnArgNotMatched) ->
@@ -144,7 +142,6 @@ mod test {
     fn test_local_variables_none_if_space() {
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     test(AnArg1,Blah) ->
@@ -160,7 +157,6 @@ mod test {
     fn test_local_variables_no_duplicates() {
         check(
             r#"
-    //- expect_parse_errors
     //- /src/sample1.erl
     -module(sample1).
     handle_update(Config, Contents) ->
diff --git a/crates/ide_db/src/diagnostic_code.rs b/crates/ide_db/src/diagnostic_code.rs
index ec1e1d76cf..957caecb09 100644
--- a/crates/ide_db/src/diagnostic_code.rs
+++ b/crates/ide_db/src/diagnostic_code.rs
@@ -20,9 +20,9 @@ use serde::de;
 use strum::IntoEnumIterator;
 use strum_macros::EnumIter;
 
-// @fb-only: use crate::meta_only::MetaOnlyDiagnosticCode;
+// @fb-only
 
-// @fb-only: pub const BASE_URL: &str = crate::meta_only::BASE_URL;
+// @fb-only
 pub const BASE_URL: &str = "https://whatsapp.github.io/erlang-language-platform/docs"; // @oss-only
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash, EnumIter)]
@@ -93,7 +93,6 @@ pub enum DiagnosticCode {
     ListsReverseAppend,
     HirUnresolvedMacro,
     HirUnresolvedInclude,
-    BoundVarInLhs,
 
     // Wrapper for erlang service diagnostic codes
     ErlangService(String),
@@ -101,7 +100,7 @@ pub enum DiagnosticCode {
     Eqwalizer(String),
     // Used for ad-hoc diagnostics via lints/codemods
     AdHoc(String),
-    // @fb-only: MetaOnly(MetaOnlyDiagnosticCode),
+    // @fb-only
 }
 
 // These namespaces map the error codes returned by the Erlang Service.
@@ -117,7 +116,7 @@ pub enum Namespace {
     Parser,
     EDoc,
     WhatsApp,
-    // @fb-only: MetaOnly,
+    // @fb-only
 }
 
 impl fmt::Display for Namespace {
@@ -132,7 +131,7 @@ impl fmt::Display for Namespace {
             Namespace::Parser => "p",
             Namespace::EDoc => "o",
             Namespace::WhatsApp => "w",
-            // @fb-only: Namespace::MetaOnly => "meta_only",
+            // @fb-only
         };
         write!(f, "{namespace}")
     }
@@ -165,7 +164,7 @@ impl Namespace {
     pub fn supports_doc_path(&self) -> bool {
         match self {
             Namespace::WhatsApp => true,
-            // @fb-only: Namespace::MetaOnly => true,
+            // @fb-only
             _ => false,
         }
     }
@@ -257,11 +256,10 @@ impl DiagnosticCode {
             DiagnosticCode::HirUnresolvedMacro => "W0057".to_string(),
             DiagnosticCode::HirUnresolvedInclude => "W0058".to_string(),
             DiagnosticCode::UnavailableType => "W0059".to_string(),
-            DiagnosticCode::BoundVarInLhs => "W0060".to_string(),
             DiagnosticCode::ErlangService(c) => c.to_string(),
             DiagnosticCode::Eqwalizer(c) => format!("eqwalizer: {c}"),
             DiagnosticCode::AdHoc(c) => format!("ad-hoc: {c}"),
-            // @fb-only: DiagnosticCode::MetaOnly(c) => c.as_code(),
+            // @fb-only
         }
     }
 
@@ -273,7 +271,6 @@ impl DiagnosticCode {
             DiagnosticCode::HeadMismatch => "head_mismatch".to_string(),
             DiagnosticCode::SyntaxError => "syntax_error".to_string(),
             DiagnosticCode::BoundVarInPattern => "bound_var_in_pattern".to_string(),
-            DiagnosticCode::BoundVarInLhs => "bound_var_in_lhs".to_string(),
             DiagnosticCode::ModuleMismatch => "module_mismatch".to_string(),
             DiagnosticCode::UnusedMacro => "unused_macro".to_string(),
             DiagnosticCode::UnusedRecordField => "unused_record_field".to_string(),
@@ -363,7 +360,7 @@ impl DiagnosticCode {
             DiagnosticCode::ErlangService(c) => c.to_string(),
             DiagnosticCode::Eqwalizer(c) => c.to_string(),
             DiagnosticCode::AdHoc(c) => format!("ad-hoc: {c}"),
-            // @fb-only: DiagnosticCode::MetaOnly(c) => c.as_label(),
+            // @fb-only
         }
     }
 
@@ -374,7 +371,7 @@ impl DiagnosticCode {
     pub fn maybe_from_string(s: &str) -> Option<DiagnosticCode> {
         DIAGNOSTIC_CODE_LOOKUPS
             .get(s).cloned()
-            // @fb-only: .or_else(|| MetaOnlyDiagnosticCode::from_str(s).ok().map(DiagnosticCode::MetaOnly))
+            // @fb-only
             .or_else( ||
                 // Look for ErlangService and AdHoc
                 if let Some(code) = Self::is_adhoc(s) {
@@ -391,7 +388,7 @@ impl DiagnosticCode {
         match self {
             DiagnosticCode::DefaultCodeForEnumIter => None,
             DiagnosticCode::AdHoc(_) => None,
-            // @fb-only: DiagnosticCode::MetaOnly(_) => Some(Namespace::MetaOnly),
+            // @fb-only
             DiagnosticCode::ErlangService(code) => Namespace::from_str(code).ok(),
             _ => Namespace::from_str(&self.as_code()).ok(),
         }
@@ -400,7 +397,7 @@ impl DiagnosticCode {
     pub fn supports_doc_path(&self) -> bool {
         match self {
             DiagnosticCode::DefaultCodeForEnumIter => false,
-            // @fb-only: DiagnosticCode::MetaOnly(MetaOnlyDiagnosticCode::DefaultCodeForEnumIter) => false,
+            // @fb-only
             _ => true,
         }
     }
@@ -489,7 +486,6 @@ impl DiagnosticCode {
             DiagnosticCode::ModuleMismatch => false,
             DiagnosticCode::UnusedInclude => false,
             DiagnosticCode::BoundVarInPattern => false,
-            DiagnosticCode::BoundVarInLhs => false,
             DiagnosticCode::UnusedMacro => false,
             DiagnosticCode::UnusedRecordField => false,
             DiagnosticCode::MutableVarBug => false,
@@ -545,7 +541,7 @@ impl DiagnosticCode {
             DiagnosticCode::ErlangService(_) => false,
             DiagnosticCode::Eqwalizer(_) => false,
             DiagnosticCode::AdHoc(_) => false,
-            // @fb-only: DiagnosticCode::MetaOnly(code) => code.allows_fixme_comment(),
+            // @fb-only
         }
     }
 
diff --git a/crates/ide_db/src/eqwalizer.rs b/crates/ide_db/src/eqwalizer.rs
index fca577bb21..4deed79778 100644
--- a/crates/ide_db/src/eqwalizer.rs
+++ b/crates/ide_db/src/eqwalizer.rs
@@ -12,6 +12,7 @@ use std::sync::Arc;
 
 use elp_base_db::FileId;
 use elp_base_db::FileRange;
+use elp_base_db::FileSource;
 use elp_base_db::ModuleName;
 use elp_base_db::ProjectId;
 use elp_base_db::SourceDatabase;
@@ -88,7 +89,7 @@ pub trait EqwalizerDatabase:
     fn types_for_file(&self, file_id: FileId) -> Option<Arc<Vec<(Pos, Type)>>>;
     fn has_eqwalizer_module_marker(&self, file_id: FileId) -> bool;
     fn has_eqwalizer_ignore_marker(&self, file_id: FileId) -> bool;
-    fn is_eqwalizer_enabled(&self, file_id: FileId) -> bool;
+    fn is_eqwalizer_enabled(&self, file_id: FileId, include_tests: bool) -> bool;
 }
 
 pub fn eqwalizer_diagnostics_by_project(
@@ -113,7 +114,7 @@ fn type_at_position(
     db: &dyn EqwalizerDatabase,
     range: FileRange,
 ) -> Option<Arc<(eqwalizer::types::Type, FileRange)>> {
-    if !db.is_eqwalizer_enabled(range.file_id) {
+    if !db.is_eqwalizer_enabled(range.file_id, false) {
         return None;
     }
     let project_id = db.file_app_data(range.file_id)?.project_id;
@@ -148,7 +149,7 @@ fn type_at_position(
 }
 
 fn types_for_file(db: &dyn EqwalizerDatabase, file_id: FileId) -> Option<Arc<Vec<(Pos, Type)>>> {
-    if !db.is_eqwalizer_enabled(file_id) {
+    if !db.is_eqwalizer_enabled(file_id, false) {
         return None;
     }
     let project_id = db.file_app_data(file_id)?.project_id;
@@ -161,7 +162,7 @@ fn types_for_file(db: &dyn EqwalizerDatabase, file_id: FileId) -> Option<Arc<Vec
     None
 }
 
-fn is_eqwalizer_enabled(db: &dyn EqwalizerDatabase, file_id: FileId) -> bool {
+fn is_eqwalizer_enabled(db: &dyn EqwalizerDatabase, file_id: FileId, include_tests: bool) -> bool {
     if !otp_supported_by_eqwalizer() {
         return false;
     }
@@ -177,8 +178,11 @@ fn is_eqwalizer_enabled(db: &dyn EqwalizerDatabase, file_id: FileId) -> bool {
     let project = db.project_data(project_id);
     let eqwalizer_config = &project.eqwalizer_config;
     let module_index = db.module_index(project_id);
+    let is_src = module_index.file_source_for_file(file_id) == Some(FileSource::Src);
+    let is_test_opted_in = db.is_test_suite_or_test_helper(file_id) == Some(true) && include_tests;
     let global_opt_in = eqwalizer_config.enable_all;
-    let opt_in = global_opt_in || db.has_eqwalizer_module_marker(file_id);
+    let opt_in =
+        (global_opt_in && (is_src || is_test_opted_in)) || db.has_eqwalizer_module_marker(file_id);
     let ignored_in_config = if let Some(module_name) = module_index.module_for_file(file_id) {
         eqwalizer_config
             .ignore_modules_compiled_patterns
diff --git a/crates/ide_db/src/helpers.rs b/crates/ide_db/src/helpers.rs
index 038b41f0be..c92be86f5f 100644
--- a/crates/ide_db/src/helpers.rs
+++ b/crates/ide_db/src/helpers.rs
@@ -43,22 +43,11 @@ pub fn pick_best_token(
     tokens.max_by_key(move |t| f(t.kind()))
 }
 
-/// Given a syntax node, check it it is immediately enclosed in a call,
-/// which can represent a function call or a type.
-/// For a remote call, the node can be the module or the function name.
-/// In the former case, there is an extra level of nesting, so we need
-/// to check up to 3 steps up
 pub fn get_call(syntax: &SyntaxNode) -> Option<ast::Call> {
-    ast::Call::cast(syntax.parent()?)
-        .or_else(|| ast::Call::cast(syntax.parent()?.parent()?))
-        .or_else(|| ast::Call::cast(syntax.parent()?.parent()?.parent()?))
-}
-
-pub fn get_external_fun(syntax: &SyntaxNode) -> Option<ast::ExternalFun> {
-    if let Some(external_fun) = ast::ExternalFun::cast(syntax.parent()?) {
-        Some(external_fun)
+    if let Some(call) = ast::Call::cast(syntax.parent()?) {
+        Some(call)
     } else {
-        ast::ExternalFun::cast(syntax.parent()?.parent()?)
+        ast::Call::cast(syntax.parent()?.parent()?)
     }
 }
 
diff --git a/crates/ide_db/src/lib.rs b/crates/ide_db/src/lib.rs
index aecfd86473..a00ea1f0d9 100644
--- a/crates/ide_db/src/lib.rs
+++ b/crates/ide_db/src/lib.rs
@@ -57,7 +57,7 @@ pub mod docs;
 pub mod eqwalizer;
 mod erl_ast;
 mod line_index;
-// @fb-only: pub mod meta_only;
+// @fb-only
 pub mod metadata;
 mod search;
 pub mod text_edit;
@@ -385,7 +385,7 @@ impl TypedSemantic for RootDatabase {
 
         let project_id = app_data.project_id;
 
-        let eqwalizer_enabled = self.is_eqwalizer_enabled(file_id);
+        let eqwalizer_enabled = self.is_eqwalizer_enabled(file_id, false);
         if !eqwalizer_enabled {
             return Some(vec![]);
         }
@@ -448,17 +448,4 @@ mod tests {
         let position = fixture.position();
         debug_assert_eq!(db.clamp_offset(position.file_id, 2000.into()), 15.into())
     }
-
-    #[test]
-    #[should_panic(expected = "Fixture validation failed: syntax errors found in test fixture")]
-    fn validate_fixture_with_parse_error() {
-        let fixture = r#"
-//- /src/test.erl
--module(test).
-foo( -> ok.
-"#;
-
-        let (db, fixture) = RootDatabase::with_fixture(fixture);
-        fixture.validate(&db);
-    }
 }
diff --git a/crates/ide_db/src/rename.rs b/crates/ide_db/src/rename.rs
index bd5a49f8cf..889569ca4e 100644
--- a/crates/ide_db/src/rename.rs
+++ b/crates/ide_db/src/rename.rs
@@ -15,10 +15,8 @@
 use std::fmt;
 use std::iter::once;
 
-use elp_base_db::AnchoredPathBuf;
 use elp_base_db::FileId;
 use elp_base_db::FileRange;
-use elp_base_db::ModuleName;
 use elp_syntax::AstNode;
 use elp_syntax::ast;
 use elp_syntax::ast::in_erlang_module;
@@ -27,12 +25,9 @@ use hir::Semantic;
 
 use crate::SymbolDefinition;
 use crate::helpers::get_call;
-use crate::helpers::get_external_fun;
 use crate::search::NameLike;
-use crate::source_change::FileSystemEdit;
 use crate::source_change::SourceChange;
 use crate::text_edit::TextEdit;
-use crate::text_edit::TextEditBuilder;
 
 pub type RenameResult<T> = Result<T, RenameError>;
 
@@ -111,18 +106,6 @@ pub fn is_valid_type_name(new_name: &String) -> bool {
     false
 }
 
-// Delegate checking module name validity to the parser
-pub fn is_valid_module_name(new_name: &String) -> bool {
-    let parse = ast::SourceFile::parse_text(format!("-module({}).", new_name).as_str());
-    match parse.tree().forms().next() {
-        Some(ast::Form::ModuleAttribute(ma)) => match ma.name() {
-            Some(ast::Name::Atom(atom)) => atom.syntax().text().to_string() == *new_name,
-            _ => false,
-        },
-        _ => false,
-    }
-}
-
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum SafetyChecks {
     Yes,
@@ -139,10 +122,7 @@ impl SymbolDefinition {
     ) -> RenameResult<SourceChange> {
         match self.clone() {
             SymbolDefinition::Module(_) => {
-                if safety_check == SafetyChecks::Yes && !is_valid_module_name(new_name) {
-                    rename_error!("Invalid new module name: '{}'", new_name);
-                }
-                self.rename_reference(sema, new_name, parens_needed_in_context, safety_check)
+                rename_error!("Cannot rename module")
             }
             SymbolDefinition::Function(fun) => {
                 if safety_check == SafetyChecks::Yes && !is_valid_function_name(new_name) {
@@ -395,7 +375,6 @@ impl SymbolDefinition {
                 );
                 Ok(source_change)
             }
-            SymbolDefinition::Module(_module) => self.rename_module(sema, new_name, safety_check),
             // Note: This is basically an internal error, this function is called from
             // SymbolDefinition::rename which already weeds them out
             _ => {
@@ -403,184 +382,6 @@ impl SymbolDefinition {
             }
         }
     }
-
-    fn rename_module(
-        &self,
-        sema: &Semantic,
-        new_name: &str,
-        safety_check: SafetyChecks,
-    ) -> RenameResult<SourceChange> {
-        let file_id = self.file().file_id;
-        if let Some(project_id) = sema.db.file_project_id(file_id) {
-            let module_index = sema.db.module_index(project_id);
-            if safety_check == SafetyChecks::Yes {
-                let new_name_module = ModuleName::new(new_name);
-                if module_index
-                    .all_modules()
-                    .iter()
-                    .any(|name| name == &new_name_module)
-                {
-                    rename_error!("module '{}' already exists", new_name);
-                }
-            }
-
-            let mut source_change = SourceChange::default();
-            // Step 1, rename all references
-            let usages = self.clone().usages(sema).all();
-            let mut renamed_module_edit: TextEdit = TextEdit::default();
-            rename_remote_module_call_refs(
-                usages,
-                file_id,
-                new_name,
-                &mut source_change,
-                &mut renamed_module_edit,
-            );
-
-            // Step 2: Rename the module attribute in the module being renamed
-            let form_list = sema.form_list(file_id);
-            if let Some(module_attribute) = form_list.module_attribute() {
-                let ast = module_attribute.form_id.get_ast(sema.db, file_id);
-                if let Some(name) = ast.name() {
-                    let range = name.syntax().text_range();
-                    let mut builder = TextEdit::builder();
-                    builder.replace(range, new_name.to_string());
-                    renamed_module_edit
-                        .union(builder.finish())
-                        .expect("Could not combine TextEdits");
-                }
-            }
-
-            let anchor = file_id;
-            let path = format!("{new_name}.erl");
-            let dst = AnchoredPathBuf { anchor, path };
-            source_change.insert_new_source_edit(dst.clone().into(), renamed_module_edit);
-            source_change.push_file_system_edit(FileSystemEdit::MoveFile { src: anchor, dst });
-            Ok(source_change)
-        } else {
-            rename_error!(
-                "Could not find project for '{:?}'",
-                self.file().name(sema.db.upcast())
-            )
-        }
-    }
-}
-
-fn rename_remote_module_call_refs(
-    usages: crate::UsageSearchResult,
-    file_id: FileId,
-    new_name: &str,
-    source_change: &mut SourceChange,
-    renamed_module_edit: &mut TextEdit,
-) {
-    usages.iter().for_each(|(usage_file_id, refs)| {
-        if let Some(edit) = rename_module_in_refs(refs, new_name) {
-            if usage_file_id == file_id {
-                renamed_module_edit
-                    .union(edit)
-                    .expect("Could not combine TextEdits");
-            } else {
-                source_change.insert_source_edit(usage_file_id, edit);
-            }
-        };
-    });
-}
-
-fn rename_module_in_refs(refs: &[NameLike], new_name: &str) -> Option<TextEdit> {
-    let mut builder = TextEdit::builder();
-    for usage in refs {
-        // Note: we cannot blindly replace all occurrences of an
-        // atom that happens to be a module name
-        // We will flesh out other usages as we need them
-        let _ = rename_call_module_in_ref(usage, &mut builder, new_name);
-        let _ = rename_external_fun_module_in_ref(usage, &mut builder, new_name);
-    }
-    Some(builder.finish())
-}
-
-fn rename_call_module_in_ref(
-    usage: &NameLike,
-    builder: &mut TextEditBuilder,
-    new_name: &str,
-) -> Option<()> {
-    let call = get_call(usage.syntax())?;
-    // We can only rename an atom usage
-    let usage_atom = match usage {
-        NameLike::Name(ast::Name::Atom(atom)) => atom,
-        _ => return Some(()),
-    };
-
-    // First check if this is the module part of a remote call (e.g., module:function())
-    if let Some(ast::Expr::Remote(remote)) = call.expr()
-        && let Some(module) = remote.module()
-        && let Some(ast::ExprMax::Atom(mod_atom)) = module.module()
-        && mod_atom.syntax() == usage_atom.syntax()
-    {
-        builder.replace(usage_atom.syntax().text_range(), new_name.to_string());
-        return Some(());
-    }
-
-    // Check if this is a known function call that takes a module as an argument
-    // Extract function name and optional module name based on call type
-    let (module_name, function_name) = match call.expr()? {
-        ast::Expr::Remote(remote) => {
-            let module = remote.module()?;
-            let mod_atom = match module.module()? {
-                ast::ExprMax::Atom(atom) => atom,
-                _ => return Some(()),
-            };
-            let fun_atom = match remote.fun()? {
-                ast::ExprMax::Atom(atom) => atom,
-                _ => return Some(()),
-            };
-            (Some(mod_atom.text()?), fun_atom.text()?)
-        }
-        ast::Expr::ExprMax(ast::ExprMax::Atom(fun_atom)) => (None, fun_atom.text()?),
-        _ => return Some(()),
-    };
-
-    let args = call.args()?;
-    let args_vec: Vec<_> = args.args().collect();
-    let arity = args_vec.len();
-    let pattern_key = (module_name.as_deref(), function_name.as_str(), arity);
-
-    // Use combined patterns that merge dynamic call patterns and module argument patterns
-    let combined_patterns = hir::sema::to_def::get_module_arg_patterns();
-    if let Some(pattern) = combined_patterns.get(&pattern_key)
-        && let Some(arg) = args_vec.get(pattern.index)
-    {
-        match arg {
-            ast::Expr::ExprMax(ast::ExprMax::Atom(arg_atom))
-                if pattern.accepts_atom() && arg_atom.syntax() == usage_atom.syntax() =>
-            {
-                builder.replace(usage_atom.syntax().text_range(), new_name.to_string());
-            }
-            ast::Expr::ExprMax(ast::ExprMax::List(list)) if pattern.accepts_list() => {
-                // Handle list of modules (e.g., meck:new([mod1, mod2], Options))
-                for expr in list.exprs() {
-                    if let ast::Expr::ExprMax(ast::ExprMax::Atom(list_atom)) = expr
-                        && list_atom.syntax() == usage_atom.syntax()
-                    {
-                        builder.replace(usage_atom.syntax().text_range(), new_name.to_string());
-                        break;
-                    }
-                }
-            }
-            _ => {}
-        }
-    }
-
-    Some(())
-}
-
-fn rename_external_fun_module_in_ref(
-    usage: &NameLike,
-    builder: &mut TextEditBuilder,
-    new_name: &str,
-) -> Option<()> {
-    let external_fun = get_external_fun(usage.syntax())?;
-    let module = external_fun.module()?;
-    builder.replace(module.name()?.syntax().text_range(), new_name.to_string());
-    Some(())
 }
 
 fn source_edit_from_usages(
diff --git a/crates/ide_db/src/search.rs b/crates/ide_db/src/search.rs
index 1e66598359..20b4f050b4 100644
--- a/crates/ide_db/src/search.rs
+++ b/crates/ide_db/src/search.rs
@@ -325,7 +325,7 @@ impl<'a> FindUsages<'a> {
 
 /// Represents possible ast reference points -
 /// a string for header, or ast::Name for everything else
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone)]
 pub enum NameLike {
     Name(ast::Name),
     String(ast::String),
diff --git a/crates/ide_db/src/source_change.rs b/crates/ide_db/src/source_change.rs
index 60b62279fe..e4afbd8742 100644
--- a/crates/ide_db/src/source_change.rs
+++ b/crates/ide_db/src/source_change.rs
@@ -30,36 +30,9 @@ use crate::text_edit::TextEdit;
 use crate::text_edit::TextEditBuilder;
 use crate::tree_diff::diff;
 
-#[derive(PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Debug)]
-pub struct HashableAnchoredPathBuf {
-    /// File that this path is relative to.
-    pub anchor: FileId,
-    /// Path relative to `anchor`'s containing directory.
-    pub path: String,
-}
-
-impl From<AnchoredPathBuf> for HashableAnchoredPathBuf {
-    fn from(value: AnchoredPathBuf) -> Self {
-        HashableAnchoredPathBuf {
-            anchor: value.anchor,
-            path: value.path,
-        }
-    }
-}
-
-impl From<HashableAnchoredPathBuf> for AnchoredPathBuf {
-    fn from(value: HashableAnchoredPathBuf) -> Self {
-        AnchoredPathBuf {
-            anchor: value.anchor,
-            path: value.path,
-        }
-    }
-}
-
 #[derive(Default, Debug, Clone)]
 pub struct SourceChange {
     pub source_file_edits: FxHashMap<FileId, TextEdit>,
-    pub new_file_edits: FxHashMap<HashableAnchoredPathBuf, TextEdit>,
     pub file_system_edits: Vec<FileSystemEdit>,
     pub is_snippet: bool,
 }
@@ -73,7 +46,6 @@ impl SourceChange {
     ) -> Self {
         SourceChange {
             source_file_edits,
-            new_file_edits: FxHashMap::default(),
             file_system_edits,
             is_snippet: false,
         }
@@ -102,22 +74,6 @@ impl SourceChange {
         }
     }
 
-    /// Inserts a [`TextEdit`] for the given [`AnchoredPathBuf`]. This properly handles merging existing
-    /// edits for a file if some already exist.
-    pub fn insert_new_source_edit(&mut self, file_id: HashableAnchoredPathBuf, edit: TextEdit) {
-        match self.new_file_edits.entry(file_id) {
-            Entry::Occupied(mut entry) => {
-                never!(
-                    entry.get_mut().union(edit).is_err(),
-                    "overlapping edits for same file"
-                );
-            }
-            Entry::Vacant(entry) => {
-                entry.insert(edit);
-            }
-        }
-    }
-
     pub fn push_file_system_edit(&mut self, edit: FileSystemEdit) {
         self.file_system_edits.push(edit);
     }
@@ -129,15 +85,12 @@ impl SourceChange {
     pub fn merge(mut self, other: SourceChange) -> SourceChange {
         self.extend(other.source_file_edits);
         self.extend(other.file_system_edits);
-        self.extend(other.new_file_edits);
         self.is_snippet |= other.is_snippet;
         self
     }
 
     pub fn is_empty(&self) -> bool {
-        self.source_file_edits.is_empty()
-            && self.file_system_edits.is_empty()
-            && self.new_file_edits.is_empty()
+        self.source_file_edits.is_empty() && self.file_system_edits.is_empty()
     }
 
     pub fn text_range(&self, file_id: FileId) -> Option<TextRange> {
@@ -163,18 +116,10 @@ impl Extend<FileSystemEdit> for SourceChange {
     }
 }
 
-impl Extend<(HashableAnchoredPathBuf, TextEdit)> for SourceChange {
-    fn extend<T: IntoIterator<Item = (HashableAnchoredPathBuf, TextEdit)>>(&mut self, iter: T) {
-        iter.into_iter()
-            .for_each(|(file_id, edit)| self.insert_new_source_edit(file_id, edit));
-    }
-}
-
 impl From<FxHashMap<FileId, TextEdit>> for SourceChange {
     fn from(source_file_edits: FxHashMap<FileId, TextEdit>) -> SourceChange {
         SourceChange {
             source_file_edits,
-            new_file_edits: FxHashMap::default(),
             file_system_edits: Vec::new(),
             is_snippet: false,
         }
@@ -320,7 +265,6 @@ impl From<FileSystemEdit> for SourceChange {
     fn from(edit: FileSystemEdit) -> SourceChange {
         SourceChange {
             source_file_edits: Default::default(),
-            new_file_edits: Default::default(),
             file_system_edits: vec![edit],
             is_snippet: false,
         }
diff --git a/crates/ide_ssr/src/tests.rs b/crates/ide_ssr/src/tests.rs
index 881a5ac123..108680853e 100644
--- a/crates/ide_ssr/src/tests.rs
+++ b/crates/ide_ssr/src/tests.rs
@@ -1288,7 +1288,7 @@ fn ssr_do_not_match_pattern_missing() {
         r#"
          g() ->
              <<$",$\\,194,181,$A,$">> =
-                   """
+                 ~b"""
                    "\\µA"
                    """.
          "#,
@@ -1327,7 +1327,7 @@ fn ssr_comments_in_match() {
                     <<{ % preceding comment
                         3},
                         { 3 % following comment
-                        }>>.
+                        >>.
                 "#;
     let strategy = Strategy {
         macros: MacroStrategy::Expand,
@@ -1536,7 +1536,7 @@ fn ssr_predicates_on_match_expr_pat() {
                 %-compile({"str", var, atom}).
                 %-type foo(V) :: {"str", V, atom}.
                 foo({"hello", Var, atom}) -> {"str", Var, aa}.
-
+                
                 "#;
     let strategy = Strategy {
         macros: MacroStrategy::Expand,
@@ -1636,7 +1636,7 @@ fn ssr_predicates_on_match_type() {
     let pattern = "ssr: {_@V, _@A}.";
     let code = r#"
                 -type foo(V) :: {V, atom}.
-
+                
                 "#;
     let strategy = Strategy {
         macros: MacroStrategy::Expand,
diff --git a/crates/project_model/src/buck.rs b/crates/project_model/src/buck.rs
index 45c6b7f732..013f3cbc87 100644
--- a/crates/project_model/src/buck.rs
+++ b/crates/project_model/src/buck.rs
@@ -58,7 +58,6 @@ lazy_static! {
 }
 
 const ERL_EXT: &str = "erl";
-const BUCK_ISOLATION_DIR: &str = "lsp";
 
 #[derive(
     Debug,
@@ -109,7 +108,7 @@ impl BuckConfig {
         cmd.env_remove("RUST_BACKTRACE")
             .env_remove("RUST_LIB_BACKTRACE");
         cmd.arg("--isolation-dir");
-        cmd.arg(BUCK_ISOLATION_DIR);
+        cmd.arg("lsp");
         cmd.current_dir(self.buck_root());
         CommandProxy::new(guard, cmd)
     }
@@ -1363,56 +1362,36 @@ fn include_path_from_file(path: &AbsPath) -> AbsPathBuf {
     }
 }
 
-fn check_buck_output_success(mut command: CommandProxy<'_>) -> Result<String> {
-    let output = command.output()?;
-    if output.status.success() {
-        return String::from_utf8(output.stdout)
-            .map_err(|e| anyhow::anyhow!("Invalid UTF-8 in stdout for `{command}`: {e}"));
-    }
-    let reason = match output.status.code() {
-        Some(code) => format!("Exited with status code: {code}"),
-        None => "Process terminated by signal".to_string(),
-    };
-    let details = String::from_utf8(output.stderr).unwrap_or_default();
-    bail!("Command `{command}` failed. Reason: {reason}. Details: {details}");
-}
-
 /// This is used in tests
 pub fn get_prelude_cell(buck_config: &BuckConfig) -> Result<String> {
-    let mut command = buck_config.buck_command();
-    command
+    let output = buck_config
+        .buck_command()
         .arg("audit")
         .arg("cell")
         .arg("prelude")
-        .arg("--json");
-    let raw_output = check_buck_output_success(command)?;
-
-    let json: serde_json::Value = serde_json::from_str(&raw_output)?;
-    let prelude_path = json
-        .get("prelude")
-        .and_then(|v| v.as_str())
-        .ok_or_else(|| anyhow::anyhow!("Could not find prelude path in Buck2 output"))?
-        .to_string();
-
-    if Path::new(&prelude_path).exists() {
-        Ok(prelude_path)
-    } else {
-        get_prelude_cell_bundled(buck_config)
+        .output()?;
+    if !output.status.success() {
+        let reason = match output.status.code() {
+            Some(code) => format!("Exited with status code: {code}"),
+            None => "Process terminated by signal".to_string(),
+        };
+        let details = match String::from_utf8(output.stderr) {
+            Ok(err) => err,
+            Err(_) => "".to_string(),
+        };
+        bail!("Error evaluating Buck2 query Reason: {reason}. Details: {details}",);
     }
-}
+    let raw_output = String::from_utf8(output.stdout)?;
 
-fn get_prelude_cell_bundled(buck_config: &BuckConfig) -> Result<String> {
-    let mut command = buck_config.buck_command();
-    command.arg("root");
-    let root = check_buck_output_success(command)?;
-    let root = root.trim();
-    let bundled_prelude_path = Path::new(&root)
-        .join("buck-out")
-        .join(BUCK_ISOLATION_DIR)
-        .join("external_cells")
-        .join("bundled")
-        .join("prelude");
-    Ok(bundled_prelude_path.to_string_lossy().to_string())
+    lazy_static! {
+        static ref RE: Regex = Regex::new(r"^prelude: ([^\s]+)").unwrap();
+    }
+    let string = RE
+        .captures_iter(&raw_output)
+        .next()
+        .map(|c| c[1].to_string())
+        .unwrap();
+    Ok(string)
 }
 
 #[cfg(test)]
@@ -1643,66 +1622,72 @@ mod tests {
         assert_eq!(expected, actual)
     }
 
+    // TODO: enable when buck is properly set up on github project
+    // @fb-only
+    const BUCK_TESTS_ENABLED: bool = false; // @oss-only
+
     #[track_caller]
     fn check_buck_bxl_query(build_generated: bool, expect: Expect) {
-        let buck_root = to_abs_path_buf(&std::env::current_dir().unwrap()).unwrap();
-        // We only need buck_config to get the buck command, everything but the buck root is ignored.
-        let buck_config = BuckConfig {
-            config_path: None,
-            buck_root: Some(buck_root),
-            enabled: true,
-            deps_target: None,
-            deps_targets: vec![],
-            build_deps: false,
-            included_targets: vec![],
-            excluded_targets: vec![],
-            source_root: None,
-            test_application_labels: vec!["test_application".to_string()],
-        };
-        let generated_args = if build_generated {
-            vec!["--build_generated_code", "true"]
-        } else {
-            vec![]
-        };
-        let output = buck_config
-            .buck_command()
-            .arg("bxl")
-            .arg("prelude//erlang/elp.bxl:elp_config")
-            .arg("--")
-            .args(generated_args)
-            .arg("--included_targets")
-            .arg("root//buck_tests_2/auto_gen/...")
-            .output()
-            .unwrap();
-        if !output.status.success() {
-            panic!("{output:#?}");
-        }
-        let string = String::from_utf8(output.stdout).unwrap();
-        let prelude_cell = get_prelude_cell(&buck_config).expect("could not get prelude");
-        let string = string.replace(&prelude_cell, "/[prelude]/");
+        if BUCK_TESTS_ENABLED {
+            let buck_root = to_abs_path_buf(&std::env::current_dir().unwrap()).unwrap();
+            // We only need buck_config to get the buck command, everything but the buck root is ignored.
+            let buck_config = BuckConfig {
+                config_path: None,
+                buck_root: Some(buck_root),
+                enabled: true,
+                deps_target: None,
+                deps_targets: vec![],
+                build_deps: false,
+                included_targets: vec![],
+                excluded_targets: vec![],
+                source_root: None,
+                test_application_labels: vec!["test_application".to_string()],
+            };
+            let generated_args = if build_generated {
+                vec!["--build_generated_code", "true"]
+            } else {
+                vec![]
+            };
+            let output = buck_config
+                .buck_command()
+                .arg("bxl")
+                .arg("prelude//erlang/elp.bxl:elp_config")
+                .arg("--")
+                .args(generated_args)
+                .arg("--included_targets")
+                .arg("fbcode//whatsapp/elp/test_projects/buck_tests_2/auto_gen/...")
+                .output()
+                .unwrap();
+            if !output.status.success() {
+                panic!("{output:#?}");
+            }
+            let string = String::from_utf8(output.stdout).unwrap();
+            let prelude_cell = get_prelude_cell(&buck_config).expect("could not get prelude");
+            let string = string.replace(&prelude_cell, "/[prelude]/");
 
-        let to_replace = env!("CARGO_WORKSPACE_DIR");
-        let string = string.replace(to_replace, "/[..]/");
-        expect.assert_eq(&string);
+            let to_replace = env!("CARGO_WORKSPACE_DIR");
+            let string = string.replace(to_replace, "/[..]/");
+            expect.assert_eq(&string);
+        }
     }
 
     #[test]
     #[ignore]
     fn build_info_buck_bxl_query() {
-        if cfg!(feature = "buck") {
+        if BUCK_TESTS_ENABLED {
             check_buck_bxl_query(
                 false,
                 expect![[r#"
                 {
-                  "root//buck_tests_2/auto_gen/auto_gen_a:auto_gen_a": {
+                  "fbcode//whatsapp/elp/test_projects/buck_tests_2/auto_gen/auto_gen_a:auto_gen_a": {
                     "name": "auto_gen_a",
                     "app_name": null,
                     "suite": null,
                     "srcs": [
-                      "/[..]/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/src/auto_gen_a.erl"
+                      "/[..]/test_projects/buck_tests_2/auto_gen/auto_gen_a/src/auto_gen_a.erl"
                     ],
                     "includes": [
-                      "/[..]/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/include"
+                      "/[..]/test_projects/buck_tests_2/auto_gen/auto_gen_a/include"
                     ],
                     "labels": [
                       "user_application"
@@ -1712,7 +1697,7 @@ mod tests {
                     "included_apps": [],
                     "origin": "app"
                   },
-                  "root//buck_tests_2/auto_gen/auto_gen_a:generated_srcs": {
+                  "fbcode//whatsapp/elp/test_projects/buck_tests_2/auto_gen/auto_gen_a:generated_srcs": {
                     "name": "generated_srcs",
                     "app_name": null,
                     "suite": null,
@@ -1855,23 +1840,23 @@ mod tests {
     #[test]
     #[ignore]
     fn build_info_buck_bxl_generated_query() {
-        if cfg!(feature = "buck") {
+        if BUCK_TESTS_ENABLED {
             // Note that there is now a value for `srcs` in the
-            // "root//buck_tests_2/auto_gen/auto_gen_a:generated_srcs"
+            // "fbcode//whatsapp/elp/test_projects/buck_tests_2/auto_gen/auto_gen_a:generated_srcs"
             // target
             check_buck_bxl_query(
                 true,
                 expect![[r#"
                     {
-                      "root//buck_tests_2/auto_gen/auto_gen_a:auto_gen_a": {
+                      "fbcode//whatsapp/elp/test_projects/buck_tests_2/auto_gen/auto_gen_a:auto_gen_a": {
                         "name": "auto_gen_a",
                         "app_name": null,
                         "suite": null,
                         "srcs": [
-                          "/[..]/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/src/auto_gen_a.erl"
+                          "/[..]/test_projects/buck_tests_2/auto_gen/auto_gen_a/src/auto_gen_a.erl"
                         ],
                         "includes": [
-                          "/[..]/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/include"
+                          "/[..]/test_projects/buck_tests_2/auto_gen/auto_gen_a/include"
                         ],
                         "labels": [
                           "user_application"
@@ -1881,12 +1866,12 @@ mod tests {
                         "included_apps": [],
                         "origin": "app"
                       },
-                      "root//buck_tests_2/auto_gen/auto_gen_a:generated_srcs": {
+                      "fbcode//whatsapp/elp/test_projects/buck_tests_2/auto_gen/auto_gen_a:generated_srcs": {
                         "name": "generated_srcs",
                         "app_name": null,
                         "suite": null,
                         "srcs": [
-                          "/[..]/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/out/pretend_generated.erl"
+                          "/[..]/test_projects/buck_tests_2/auto_gen/auto_gen_a/out/pretend_generated.erl"
                         ],
                         "includes": [],
                         "labels": [
diff --git a/crates/project_model/src/test_fixture.rs b/crates/project_model/src/test_fixture.rs
index 140baec0ee..ac60d3b7c2 100644
--- a/crates/project_model/src/test_fixture.rs
+++ b/crates/project_model/src/test_fixture.rs
@@ -187,7 +187,6 @@ impl DiagnosticsEnabled {
 pub struct FixtureWithProjectMeta {
     pub fixture: Vec<Fixture>,
     pub diagnostics_enabled: DiagnosticsEnabled,
-    pub expect_parse_errors: bool,
 }
 
 impl FixtureWithProjectMeta {
@@ -205,7 +204,6 @@ impl FixtureWithProjectMeta {
         let mut fixture = fixture.as_str();
         let mut res: Vec<Fixture> = Vec::new();
         let mut diagnostics_enabled = DiagnosticsEnabled::default();
-        let mut expect_parse_errors = false;
 
         // ---------------------------------------
         // Each of the following is optional, but they must always
@@ -234,12 +232,6 @@ impl FixtureWithProjectMeta {
             fixture = remain;
         }
 
-        if let Some(meta) = fixture.strip_prefix("//- expect_parse_errors") {
-            let (_meta, remain) = meta.split_once('\n').unwrap();
-            expect_parse_errors = true;
-            fixture = remain;
-        }
-
         if let Some(meta) = fixture.strip_prefix("//- native") {
             let (_meta, remain) = meta.split_once('\n').unwrap();
             diagnostics_enabled.use_native = true;
@@ -285,12 +277,6 @@ impl FixtureWithProjectMeta {
 
                 if let Some(entry) = res.last_mut() {
                     entry.text.push_str(line);
-                } else if line.chars().any(|c| !c.is_whitespace()) {
-                    panic!(
-                        "Fixture has content before the first file marker (`//- /path/to/file.erl`). \
-                         Did you forget to add a file marker at the beginning?\n\
-                         The offending line: {line:?}"
-                    );
                 }
             }
         }
@@ -312,7 +298,6 @@ impl FixtureWithProjectMeta {
         FixtureWithProjectMeta {
             fixture: res,
             diagnostics_enabled,
-            expect_parse_errors,
         }
     }
 
@@ -853,19 +838,6 @@ mod tests {
     use crate::test_fixture::extract_tags;
     use crate::test_fixture::remove_annotations;
 
-    #[test]
-    #[should_panic(expected = "Fixture has content before the first file marker")]
-    fn parse_fixture_panics_on_content_before_first_file_marker() {
-        FixtureWithProjectMeta::parse(
-            r#"
-        -module(main).
-        foo() -> ok.
-        //- /src/erl_eval.erl
-        -module(erl_eval).
-        "#,
-        );
-    }
-
     #[test]
     #[should_panic]
     fn parse_fixture_checks_further_indented_metadata() {
diff --git a/editors/code/README.md b/editors/code/README.md
index ff5663d5ca..b03ce757f2 100644
--- a/editors/code/README.md
+++ b/editors/code/README.md
@@ -1,82 +1,19 @@
 # Erlang Language Platform
 
-The **Erlang Language Platform (ELP)** is a modern Language Server Protocol
-(LSP) implementation for Erlang, developed by WhatsApp. ELP provides
-comprehensive IDE support for Erlang development, bringing features you'd expect
-from modern development tools to the Erlang ecosystem.
-
-Built with scalability and performance in mind, ELP uses incremental analysis to
-handle large codebases efficiently, making it suitable for projects of any size.
+Provide support for the [Erlang](https://www.erlang.org/) Programming Language.
 
 ## Features
 
-### Code Intelligence
-
-- **📍 Go To Definition** - Jump to function, type, record definitions, etc
-- **🔍 Find References** - Find all usages of functions, types, and variables
-- **✨ Auto-completion** - Intelligent code completion for functions, variables,
-  modules and more
-- **🏷️ Hover Information** - View documentation and type information on hover
-- **📞 Call Hierarchy** - Explore caller/callee relationships
-- **✍️ Signature Help** - Parameter hints while typing function calls
-- **📋 Inlay Hints** - Display parameter names inline
-- **🎨 Syntax Highlighting** - Full Erlang syntax support
-- **📝 Code Lenses** - Inline actions for running tests and debugging
-- **🔄 Workspace Symbol Search** - Quickly find symbols across your project
-
-### Code Quality
-
-- **🔧 Diagnostics** - Real-time error and warning detection
-- **💡 Code Actions** - Quick fixes and refactoring suggestions
-- **🧪 Eqwalizer Integration** - Type checking with
-  [Eqwalizer](https://github.com/WhatsApp/eqwalizer)
-
-### Debugging & Testing
-
-- **🐞 Integrated Debugger** - Debug Erlang applications with breakpoints and
-  variable inspection
+* Syntax Highlighting
+* Go To Definition
+* Find References
+* Auto-completion
+* Call Hierarchy
+* Signature Help
+* Diagnostics
+* Inlay Hints
+* ...
 
 ## Documentation
 
-For comprehensive documentation, visit:
-
-- **📚
-  [Official Documentation](https://whatsapp.github.io/erlang-language-platform/)**
-- **🚀
-  [Getting Started Guide](https://whatsapp.github.io/erlang-language-platform/docs/get-started/)**
-- **⚙️
-  [Configuration Reference](https://whatsapp.github.io/erlang-language-platform/docs/configuration/)**
-- **❓ [FAQ](https://whatsapp.github.io/erlang-language-platform/docs/faq/)**
-
-## Contributing
-
-We welcome contributions! Please see our
-[Contributing Guide](https://github.com/WhatsApp/erlang-language-platform/blob/main/CONTRIBUTING.md)
-for details.
-
-## Community & Support
-
-- **🐛 Issues**:
-  [GitHub Issues](https://github.com/WhatsApp/erlang-language-platform/issues)
-- **💬 Discussions**:
-  [GitHub Discussions](https://github.com/WhatsApp/erlang-language-platform/discussions)
-
-## License
-
-ELP is dual-licensed under:
-
-- [Apache License 2.0](https://github.com/WhatsApp/erlang-language-platform/blob/main/LICENSE-APACHE)
-- [MIT License](https://github.com/WhatsApp/erlang-language-platform/blob/main/LICENSE-MIT)
-
-## Acknowledgments
-
-ELP was designed at **WhatsApp** and inspired by the
-[Rust Analyzer](https://rust-analyzer.github.io/) project. Special thanks to all
-[contributors](https://github.com/WhatsApp/erlang-language-platform/graphs/contributors)
-who have helped make ELP better.
-
----
-
-<p align="center">
-  Made with ❤️ by the WhatsApp team
-</p>
+See https://whatsapp.github.io/erlang-language-platform/ for more information.
diff --git a/editors/code/package-lock.json b/editors/code/package-lock.json
index 6309d4c81e..66d227ce12 100644
--- a/editors/code/package-lock.json
+++ b/editors/code/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "erlang-language-platform",
-  "version": "0.47.0",
+  "version": "0.45.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "erlang-language-platform",
-      "version": "0.47.0",
+      "version": "0.45.0",
       "hasInstallScript": true,
       "license": "Apache2",
       "devDependencies": {
diff --git a/editors/code/package.json b/editors/code/package.json
index eb7ced3148..ae34cde798 100644
--- a/editors/code/package.json
+++ b/editors/code/package.json
@@ -1,10 +1,9 @@
 {
   "name": "erlang-language-platform",
-  "displayName": "Erlang Language Platform",
-  "description": "Erlang Language Support for VS Code, by WhatsApp.",
+  "description": "Erlang language server",
   "author": "Meta Platforms, Inc",
   "license": "Apache2",
-  "version": "0.47.0",
+  "version": "0.45.0",
   "icon": "images/elp-logo-color.png",
   "homepage": "https://whatsapp.github.io/erlang-language-platform/",
   "repository": {
@@ -21,8 +20,7 @@
     "Testing"
   ],
   "keywords": [
-    "elp",
-    "erlang"
+    "elp"
   ],
   "engines": {
     "vscode": "^1.75.0"
diff --git a/eqwalizer b/eqwalizer
index 0f514eb389..1e0f24c5b8 160000
--- a/eqwalizer
+++ b/eqwalizer
@@ -1 +1 @@
-Subproject commit 0f514eb3893fa7070835c83ecb49fbea31b0426d
+Subproject commit 1e0f24c5b8f2b023fdd53d4571c3240430d31f69
diff --git a/erlang_service/src/elp_lint.erl b/erlang_service/src/elp_lint.erl
index 31d2c70248..609e8c0712 100644
--- a/erlang_service/src/elp_lint.erl
+++ b/erlang_service/src/elp_lint.erl
@@ -4372,14 +4372,14 @@ is_format_function(io, fwrite) -> true;
 is_format_function(io, format) -> true;
 is_format_function(io_lib, fwrite) -> true;
 is_format_function(io_lib, format) -> true;
-% @fb-only: is_format_function(wa_log, send_if) -> true;
-% @fb-only: is_format_function(wa_string, format) -> true;
+% @fb-only
+% @fb-only
 is_format_function(M, F) when is_atom(M), is_atom(F) -> false.
 
 %% check_format_1([Arg]) -> ok | {warn,Level,Format,[Arg]}.
 
-% @fb-only[end= ]: format_args(wa_log, send_if, [_Level, _Meta, _Opts, Format, Args]) -> [Format, Args];
-% @fb-only[end= ]: format_args(wa_string, format, [Format, Args, _Options]) -> [Format, Args];
+% @fb-only
+% @fb-only
 format_args(_M, _F, As) ->
     As.
 
diff --git a/test/test_projects/.buckconfig b/test/test_projects/.buckconfig
deleted file mode 100644
index f14e564a7d..0000000000
--- a/test/test_projects/.buckconfig
+++ /dev/null
@@ -1,24 +0,0 @@
-[cells]
-  root = .
-  prelude = prelude
-  toolchains = toolchains
-  none = none
-
-[cell_aliases]
-  config = prelude
-  ovr_config = prelude
-  fbcode = none
-  fbsource = none
-  fbcode_macros = none
-  buck = none
-
-[external_cells]
-  prelude = bundled
-
-[parser]
-  target_platform_detector_spec = target:root//...->prelude//platforms:default \
-    target:prelude//...->prelude//platforms:default \
-    target:toolchains//...->prelude//platforms:default
-
-[build]
-  execution_platforms = prelude//platforms:default
diff --git a/test/test_projects/.buckroot b/test/test_projects/.buckroot
deleted file mode 100644
index e69de29bb2..0000000000
diff --git a/test/test_projects/buck_bad_config/.elp.toml b/test/test_projects/buck_bad_config/.elp.toml
deleted file mode 100644
index 963072284c..0000000000
--- a/test/test_projects/buck_bad_config/.elp.toml
+++ /dev/null
@@ -1,8 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [ "root//buck_bad_config/..." ]
-source_root = "buck_bad_config"
-
-[eqwalizer]
-enable_all = false
diff --git a/test/test_projects/buck_bad_config/BUCK b/test/test_projects/buck_bad_config/BUCK
deleted file mode 100644
index 498c769dac..0000000000
--- a/test/test_projects/buck_bad_config/BUCK
+++ /dev/null
@@ -1,14 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "bad_app",
-    srcs = glob(["src/*.erl"]),
-    applications = [
-        "root//buck_bad_config/non_existent:missing",
-    ],
-    includes = glob(
-        ["include/*.hrl"],
-        exclude = ["include/junk.hrl"],
-    ),
-    version = "1.0.0",
-)
diff --git a/test/test_projects/buck_tests/.elp.toml b/test/test_projects/buck_tests/.elp.toml
deleted file mode 100644
index b38d6f043f..0000000000
--- a/test/test_projects/buck_tests/.elp.toml
+++ /dev/null
@@ -1,9 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [ "root//buck_tests/..." ]
-excluded_targets = [ "buck_tests:test_elp_ignored" ]
-source_root = "buck_tests"
-
-[eqwalizer]
-enable_all = false
diff --git a/test/test_projects/buck_tests_2/.elp.toml b/test/test_projects/buck_tests_2/.elp.toml
deleted file mode 100644
index e71eb6a819..0000000000
--- a/test/test_projects/buck_tests_2/.elp.toml
+++ /dev/null
@@ -1,12 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [
-    "root//buck_tests_2/util/app_a/...",
-    "root//buck_tests_2:check_include"
-    ]
-excluded_targets = [ "root//buck_tests_2:test_elp_ignored" ]
-source_root = "buck_tests_2"
-
-[eqwalizer]
-enable_all = false
diff --git a/test/test_projects/buck_tests_2/BUCK b/test/test_projects/buck_tests_2/BUCK
deleted file mode 100644
index b01fdb868c..0000000000
--- a/test/test_projects/buck_tests_2/BUCK
+++ /dev/null
@@ -1,41 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "check_include",
-    srcs = [
-        "check_include/src/top_includer.erl",
-    ],
-    applications = [
-        "common_test",
-        "stdlib",
-        "root//buck_tests_2:check_include_separate_1",
-        "root//buck_tests_2:check_include_separate_2",
-    ],
-    includes = [],
-    labels = [],
-    resources = [],
-)
-
-erlang_application(
-    name = "check_include_separate_1",
-    srcs = glob([
-        "src/*.erl",
-    ]),
-    applications = [
-    ],
-    includes = [
-        "check_include_separate_1/include/top_includer.hrl",
-    ],
-    resources = [],
-)
-
-erlang_application(
-    name = "check_include_separate_2",
-    srcs = glob([
-        "src/*.erl",
-    ]),
-    applications = [
-    ],
-    includes = glob(["check_include_separate_2/include/*.hrl"]),
-    resources = [],
-)
diff --git a/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/BUCK b/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/BUCK
deleted file mode 100644
index f021317020..0000000000
--- a/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/BUCK
+++ /dev/null
@@ -1,25 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "auto_gen_a",
-    srcs = glob([
-        "src/*.erl",
-        "src/*.hrl",
-    ]),
-    includes = glob(["include/*.hrl"]),
-    visibility = ["//buck_tests_2/..."],
-)
-
-erlang_application(
-    name = "generated_srcs",
-    srcs = [
-        ":generated.erl",
-    ],
-    labels = ["generated"],
-    visibility = ["//buck_tests_2/..."],
-)
-
-export_file(
-    name = "generated.erl",
-    src = "out/pretend_generated.erl",
-)
diff --git a/test/test_projects/buck_tests_2/generated/BUCK b/test/test_projects/buck_tests_2/generated/BUCK
deleted file mode 100644
index 8eec40830b..0000000000
--- a/test/test_projects/buck_tests_2/generated/BUCK
+++ /dev/null
@@ -1,12 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "generated_headers",
-    includes = [
-        "out/generated_header.hrl",
-    ],
-    labels = ["generated"],
-    visibility = [
-        "PUBLIC",
-    ],
-)
diff --git a/test/test_projects/buck_tests_2/util/app_a/BUCK b/test/test_projects/buck_tests_2/util/app_a/BUCK
deleted file mode 100644
index 4231c1c6e8..0000000000
--- a/test/test_projects/buck_tests_2/util/app_a/BUCK
+++ /dev/null
@@ -1,16 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "app_a_target",
-    srcs = glob(["src/*.erl"]),
-    app_name = "app_a",
-    applications = [
-        "root//buck_tests_2/auto_gen/auto_gen_a:auto_gen_a",
-        "root//buck_tests_2/generated:generated_headers",
-    ],
-    includes = glob(
-        ["include/*.hrl"],
-        exclude = ["include/junk.hrl"],
-    ),
-    version = "1.0.0",
-)
diff --git a/test/test_projects/codegen_test/BUCK b/test/test_projects/codegen_test/BUCK
deleted file mode 100644
index 1df5f86eba..0000000000
--- a/test/test_projects/codegen_test/BUCK
+++ /dev/null
@@ -1,73 +0,0 @@
-oncall("vscode_erlang")
-
-# Code generation rule - generates Erlang modules from template files
-genrule(
-    name = "example_service_types_erl",
-    srcs = [
-        "templates/example_service_types.erl",
-    ],
-    outs = {
-        "example_service_types.erl": ["example_service_types.erl"],
-    },
-    cmd = "cp $SRCDIR/templates/example_service_types.erl $OUT/example_service_types.erl",
-)
-
-genrule(
-    name = "example_service_client_erl",
-    srcs = [
-        "templates/example_service_client.erl",
-    ],
-    outs = {
-        "example_service_client.erl": ["example_service_client.erl"],
-    },
-    cmd = "cp $SRCDIR/templates/example_service_client.erl $OUT/example_service_client.erl",
-)
-
-genrule(
-    name = "example_service_types_hrl",
-    srcs = [
-        "templates/example_service_types.hrl",
-    ],
-    outs = {
-        "example_service_types.hrl": ["example_service_types.hrl"],
-    },
-    cmd = "cp $SRCDIR/templates/example_service_types.hrl $OUT/example_service_types.hrl",
-)
-
-# Erlang library containing only the generated code
-erlang_app(
-    name = "example_service_generated",
-    srcs = [
-        # Include generated Erlang modules from genrule output
-        ":example_service_types_erl[example_service_types.erl]",
-        ":example_service_client_erl[example_service_client.erl]",
-    ],
-    includes = [
-        # Include generated header files from genrule output
-        ":example_service_types_hrl[example_service_types.hrl]",
-    ],
-)
-
-# Erlang application that uses the generated code (non-generated files only)
-erlang_application(
-    name = "codegen_test_app",
-    srcs = glob(["app_a/src/*.erl"]),
-    app_name = "codegen_test",
-    app_src = "app_a/src/codegen_test.app.src",
-    applications = [
-        "kernel",
-        "stdlib",
-        ":example_service_generated",
-    ],
-    includes = glob(["app_a/include/*.hrl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-# Test to verify the generated code works
-erlang_tests(
-    suites = [
-        "app_a/test/codegen_test_SUITE.erl",
-    ],
-    deps = [":codegen_test_app"],
-)
diff --git a/test/test_projects/codegen_test/README.md b/test/test_projects/codegen_test/README.md
deleted file mode 100644
index 1f73475d9d..0000000000
--- a/test/test_projects/codegen_test/README.md
+++ /dev/null
@@ -1,138 +0,0 @@
-# Code Generation Test Project
-
-This test project demonstrates Buck2-based code generation for Erlang
-applications using `genrule`.
-
-## Project Structure
-
-```
-codegen_test/
-├── .elp.toml                      # ELP configuration
-├── BUCK                           # Buck build configuration with genrule
-├── README.md                      # This file
-├── templates/                     # Erlang template files (input)
-│   ├── example_service_types.erl  # Type definitions template
-│   ├── example_service_client.erl # Client stubs template
-│   └── example_service_types.hrl  # Header file template
-├── generated/                     # Pre-generated code (for reference)
-│   ├── example_service_types.erl  # Generated type module
-│   ├── example_service_client.erl # Generated client stubs
-│   └── example_service_types.hrl  # Generated header file
-└── app_a/
-    ├── src/
-    │   ├── codegen_test.app.src   # Application metadata
-    │   └── example_usage.erl      # Example using generated code
-    └── test/
-        └── codegen_test_SUITE.erl # Test suite
-```
-
-## How It Works
-
-### 1. Template Files
-
-The templates directory contains well-formed Erlang files that serve as input to
-the code generation process. These are complete, valid Erlang files that are
-copied to the output directory during the build.
-
-### 2. Code Generation
-
-The code is generated automatically during the build process using a
-`genrule`:
-
-```python
-genrule(
-    name = "example_service_types_erl",
-    srcs = [
-        "templates/example_service_types.erl",
-    ],
-    outs = {
-        "example_service_types.erl": ["example_service_types.erl"],
-    },
-    cmd = "cp $SRCDIR/templates/example_service_types.erl $OUT/example_service_types.erl",
-)
-```
-
-The genrule:
-
-- Takes the template file as input (`srcs`)
-- Defines named outputs using `outs` parameter (creates subtargets for each
-  file)
-- Uses `cp` command to copy template files to `$OUT`
-- Outputs files to `$OUT` directory in `buck-out/`
-
-### 3. Build Integration
-
-The `BUCK` file references the generated files using subtarget syntax:
-
-```python
-erlang_app(
-    name = "example_service_generated",
-    srcs = [
-        ":example_service_types_erl[example_service_types.erl]",
-        ":example_service_client_erl[example_service_client.erl]",
-    ],
-    includes = [
-        ":example_service_types_hrl[example_service_types.hrl]",
-    ],
-)
-```
-
-When Buck builds the application:
-
-1. The genrule runs first, copying the template Erlang files to the output
-2. The generated files are placed in
-   `buck-out/v2/gen/.../example_service_types_erl/`
-3. The `erlang_app` consumes these files via subtarget references (`[filename]`
-   syntax)
-4. The files are copied to the application's build directory in `buck-out/`
-
-### 4. Using Generated Code
-
-Application code includes the generated header and uses the types:
-
-```erlang
--module(example_usage).
--include("example_service_types.hrl").
-
-create_sample_user() ->
-    #user_info{
-        user_id = <<"user_123">>,
-        username = <<"john_doe">>,
-        age = 25,
-        is_active = true
-    }.
-
-get_user_by_id(UserId) ->
-    example_service_client:get_user(UserId).
-```
-
-## Building and Testing
-
-```bash
-# Build just the code generation step
-buck2 build fbcode//whatsapp/elp/test/test_projects/codegen_test:example_service_types_erl
-
-# Build the application (automatically runs code generation)
-buck2 build fbcode//whatsapp/elp/test/test_projects/codegen_test:codegen_test_app
-
-# Run tests
-buck2 test fbcode//whatsapp/elp/test/test_projects/codegen_test:codegen_test_SUITE
-
-# View generated files in buck-out
-find buck-out -path "*codegen_test*" -name "example_service_*.erl"
-```
-
-## Test Coverage
-
-The test suite (`app_a/test/codegen_test_SUITE.erl`) verifies:
-
-- Generated record types work correctly
-- Generated client functions are callable
-- Record fields have correct types and defaults
-- Integration with application code
-
-All tests pass:
-
-```
-Tests finished: Pass 3. Fail 0. Fatal 0. Skip 0. Build failure 0
-```
diff --git a/test/test_projects/codegen_test/app_a/src/codegen_test.app.src b/test/test_projects/codegen_test/app_a/src/codegen_test.app.src
deleted file mode 100644
index 7a38d49a24..0000000000
--- a/test/test_projects/codegen_test/app_a/src/codegen_test.app.src
+++ /dev/null
@@ -1,14 +0,0 @@
-{application, codegen_test,
- [{description, "Test application demonstrating code generation"},
-  {vsn, "1.0.0"},
-  {registered, []},
-  {applications,
-   [kernel,
-    stdlib,
-    example_service_generated
-   ]},
-  {env,[]},
-  {modules, []},
-  {licenses, ["Apache 2.0"]},
-  {links, []}
- ]}.
diff --git a/test/test_projects/codegen_test/app_a/src/example_usage.erl b/test/test_projects/codegen_test/app_a/src/example_usage.erl
deleted file mode 100644
index a624c2089b..0000000000
--- a/test/test_projects/codegen_test/app_a/src/example_usage.erl
+++ /dev/null
@@ -1,51 +0,0 @@
--module(example_usage).
--compile([warn_missing_spec_all]).
--moduledoc """
-Example module that demonstrates using generated code.
-This module uses the types and client functions generated from
-the example_service.schema file.
-""".
-
-%% Include the generated header file
--include_lib("example_service_generated/include/example_service_types.hrl").
-
-%% API exports
--export([
-    create_sample_user/0,
-    create_query_request/1,
-    get_user_by_id/1
-]).
-
-%%%===================================================================
-%%% API
-%%%===================================================================
-
--doc """
-Creates a sample user_info record using generated types
-""".
--spec create_sample_user() -> #user_info{}.
-create_sample_user() ->
-    #user_info{
-        user_id = <<"user_123">>,
-        username = <<"john_doe">>,
-        age = 25,
-        is_active = true
-    }.
-
--doc """
-Creates a query_request record
-""".
--spec create_query_request(binary()) -> #query_request{}.
-create_query_request(QueryId) ->
-    #query_request{
-        query_id = QueryId,
-        filters = [{age, greater_than, 18}]
-    }.
-
--doc """
-Uses the generated client to get user information
-""".
--spec get_user_by_id(binary()) -> {ok, term()} | {error, term()}.
-get_user_by_id(UserId) ->
-    %% This calls the generated client function
-    example_service_client:get_user(UserId).
diff --git a/test/test_projects/codegen_test/app_a/test/codegen_test_SUITE.erl b/test/test_projects/codegen_test/app_a/test/codegen_test_SUITE.erl
deleted file mode 100644
index 3c0135dcee..0000000000
--- a/test/test_projects/codegen_test/app_a/test/codegen_test_SUITE.erl
+++ /dev/null
@@ -1,73 +0,0 @@
-%%% Test suite for code generation functionality
--module(codegen_test_SUITE).
-
--include_lib("stdlib/include/assert.hrl").
--include("example_service_types.hrl").
-
-%% CT callbacks
--export([all/0, init_per_suite/1, end_per_suite/1]).
-
-%% Test cases
--export([
-    test_generated_types/1,
-    test_generated_client/1,
-    test_user_record_creation/1
-]).
-
-%%%===================================================================
-%%% CT Callbacks
-%%%===================================================================
-
-all() ->
-    [
-        test_generated_types,
-        test_generated_client,
-        test_user_record_creation
-    ].
-
-init_per_suite(Config) ->
-    Config.
-
-end_per_suite(_Config) ->
-    ok.
-
-%%%===================================================================
-%%% Test Cases
-%%%===================================================================
-
-test_generated_types(_Config) ->
-    %% Test that we can create a user_info record
-    User = #user_info{
-        user_id = <<"test_123">>,
-        username = <<"testuser">>,
-        age = 30,
-        is_active = true
-    },
-
-    %% Verify the record fields
-    ?assertEqual(<<"test_123">>, User#user_info.user_id),
-    ?assertEqual(<<"testuser">>, User#user_info.username),
-    ?assertEqual(30, User#user_info.age),
-    ?assertEqual(true, User#user_info.is_active),
-
-    ok.
-
-test_generated_client(_Config) ->
-    %% Test that the generated client module exists and can be called
-    Result = example_service_client:get_user(<<"user_123">>),
-
-    %% The generated stub returns {ok, generated_response}
-    ?assertMatch({ok, _}, Result),
-
-    ok.
-
-test_user_record_creation(_Config) ->
-    %% Test the example_usage module
-    User = example_usage:create_sample_user(),
-
-    %% Verify it's a valid user_info record
-    ?assertMatch(#user_info{}, User),
-    ?assertEqual(<<"user_123">>, User#user_info.user_id),
-    ?assertEqual(25, User#user_info.age),
-
-    ok.
diff --git a/test/test_projects/codegen_test/generated/example_service_client.erl b/test/test_projects/codegen_test/generated/example_service_client.erl
deleted file mode 100644
index 6b38c39425..0000000000
--- a/test/test_projects/codegen_test/generated/example_service_client.erl
+++ /dev/null
@@ -1,37 +0,0 @@
-%%%-------------------------------------------------------------------
-%%% @doc
-%%% Auto-generated client for example_service
-%%% DO NOT EDIT - Generated by generate_erlang.sh
-%%% @end
-%%%-------------------------------------------------------------------
--module(example_service_client).
-
--include("example_service_types.hrl").
-
-%% API exports
--export([get_user/1]).
--export([query_users/1]).
--export([update_user/2]).
-
-%%%===================================================================
-%%% API
-%%%===================================================================
-
-
-%% @doc Retrieves user information by user ID
--spec get_user(term()) -> {ok, term()} | {error, term()}.
-get_user(_UserId) ->
-    %% Auto-generated client stub
-    {ok, generated_response}.
-
-%% @doc Queries users with given filters
--spec query_users(term()) -> {ok, term()} | {error, term()}.
-query_users(_Request) ->
-    %% Auto-generated client stub
-    {ok, generated_response}.
-
-%% @doc Updates user information
--spec update_user(term(), term()) -> {ok, term()} | {error, term()}.
-update_user(_UserId, _UserInfo) ->
-    %% Auto-generated client stub
-    {ok, generated_response}.
diff --git a/test/test_projects/codegen_test/generated/example_service_types.erl b/test/test_projects/codegen_test/generated/example_service_types.erl
deleted file mode 100644
index 3f89adcba9..0000000000
--- a/test/test_projects/codegen_test/generated/example_service_types.erl
+++ /dev/null
@@ -1,55 +0,0 @@
-%%%-------------------------------------------------------------------
-%%% @doc
-%%% Auto-generated type definitions for example_service
-%%% DO NOT EDIT - Generated by generate_erlang.sh
-%%% @end
-%%%-------------------------------------------------------------------
--module(example_service_types).
-
-%% API exports
--export([new_user_info/0]).
--export([new_query_request/0]).
--export([new_query_response/0]).
--export([get_version/0]).
-
-%% Type exports
--export_type([user_info/0]).
--export_type([query_request/0]).
--export_type([query_response/0]).
-
-%% Record definitions
--record(user_info, {user_id = <<>>, username = <<>>, age = 0, is_active = false}).
--record(query_request, {query_id = <<>>, filters = []}).
--record(query_response, {results = [], count = 0}).
-
-%% Type definitions
--type user_info() :: #user_info{}.
--type query_request() :: #query_request{}.
--type query_response() :: #query_response{}.
-
-%%%===================================================================
-%%% API
-%%%===================================================================
-
-%% @doc Returns the schema version
--spec get_version() -> binary().
-get_version() ->
-    <<"1.0.0">>.
-
-
-%% @doc Creates a new user_info record
--spec new_user_info() -> #user_info{}.
-new_user_info() ->
-    #user_info{}.
-
-
-%% @doc Creates a new query_request record
--spec new_query_request() -> #query_request{}.
-new_query_request() ->
-    #query_request{}.
-
-
-%% @doc Creates a new query_response record
--spec new_query_response() -> #query_response{}.
-new_query_response() ->
-    #query_response{}.
diff --git a/test/test_projects/codegen_test/generated/example_service_types.hrl b/test/test_projects/codegen_test/generated/example_service_types.hrl
deleted file mode 100644
index 4c957a0906..0000000000
--- a/test/test_projects/codegen_test/generated/example_service_types.hrl
+++ /dev/null
@@ -1,27 +0,0 @@
-%%%-------------------------------------------------------------------
-%%% @doc
-%%% Auto-generated header file for example_service
-%%% DO NOT EDIT - Generated by generate_erlang.sh
-%%% @end
-%%%-------------------------------------------------------------------
-
-
--record(user_info, {
-
-    user_id = <<>> :: binary(),
-    username = <<>> :: binary(),
-    age = 0 :: integer(),
-    is_active = false :: boolean()
-}).
-
--record(query_request, {
-
-    query_id = <<>> :: binary(),
-    filters = [] :: list()
-}).
-
--record(query_response, {
-
-    results = [] :: list(),
-    count = 0 :: integer()
-}).
diff --git a/test/test_projects/codegen_test/templates/example_service_client.erl b/test/test_projects/codegen_test/templates/example_service_client.erl
deleted file mode 100644
index ab30a89f74..0000000000
--- a/test/test_projects/codegen_test/templates/example_service_client.erl
+++ /dev/null
@@ -1,38 +0,0 @@
-%%%-------------------------------------------------------------------
-%%% @doc
-%%% Auto-generated client for example_service
-%%% DO NOT EDIT - Generated by generate_erlang.sh
-%%% @end
-%%%-------------------------------------------------------------------
--module(example_service_client).
-
--include("example_service_types.hrl").
-
-%% API exports
--export([get_user/1]).
--export([query_users/1]).
--export([update_user/2]).
-
-%%%===================================================================
-%%% API
-%%%===================================================================
-
-
-%% @doc Retrieves user information by user ID
--spec get_user(term()) -> {ok, term()} | {error, term()}.
-get_user(_UserId) ->
-    %% Auto-generated client stub
-    {ok, generated_response}.
-
-%% @doc Queries users with given filters
--spec query_users(term()) -> {ok, term()} | {error, term()}.
-query_users(_Request) ->
-    %% Auto-generated client stub
-    {ok, generated_response}.
-
-%% @doc Updates user information
--spec update_user(term(), term()) -> {ok, term()} | {error, term()}.
-update_user(_UserId, _UserInfo) ->
-    %% Auto-generated client stub
-    {ok, generated_response}.
-
diff --git a/test/test_projects/codegen_test/templates/example_service_types.erl b/test/test_projects/codegen_test/templates/example_service_types.erl
deleted file mode 100644
index 833df167c6..0000000000
--- a/test/test_projects/codegen_test/templates/example_service_types.erl
+++ /dev/null
@@ -1,56 +0,0 @@
-%%%-------------------------------------------------------------------
-%%% @doc
-%%% Auto-generated type definitions for example_service
-%%% DO NOT EDIT - Generated by generate_erlang.sh
-%%% @end
-%%%-------------------------------------------------------------------
--module(example_service_types).
-
-%% API exports
--export([new_user_info/0]).
--export([new_query_request/0]).
--export([new_query_response/0]).
--export([get_version/0]).
-
-%% Type exports
--export_type([user_info/0]).
--export_type([query_request/0]).
--export_type([query_response/0]).
-
-%% Record definitions
--record(user_info, {user_id = <<>>, username = <<>>, age = 0, is_active = false}).
--record(query_request, {query_id = <<>>, filters = []}).
--record(query_response, {results = [], count = 0}).
-
-%% Type definitions
--type user_info() :: #user_info{}.
--type query_request() :: #query_request{}.
--type query_response() :: #query_response{}.
-
-%%%===================================================================
-%%% API
-%%%===================================================================
-
-%% @doc Returns the schema version
--spec get_version() -> binary().
-get_version() ->
-    <<"1.0.0">>.
-
-
-%% @doc Creates a new user_info record
--spec new_user_info() -> #user_info{}.
-new_user_info() ->
-    #user_info{}.
-
-
-%% @doc Creates a new query_request record
--spec new_query_request() -> #query_request{}.
-new_query_request() ->
-    #query_request{}.
-
-
-%% @doc Creates a new query_response record
--spec new_query_response() -> #query_response{}.
-new_query_response() ->
-    #query_response{}.
-
diff --git a/test/test_projects/codegen_test/templates/example_service_types.hrl b/test/test_projects/codegen_test/templates/example_service_types.hrl
deleted file mode 100644
index 88a2e7aed2..0000000000
--- a/test/test_projects/codegen_test/templates/example_service_types.hrl
+++ /dev/null
@@ -1,28 +0,0 @@
-%%%-------------------------------------------------------------------
-%%% @doc
-%%% Auto-generated header file for example_service
-%%% DO NOT EDIT - Generated by generate_erlang.sh
-%%% @end
-%%%-------------------------------------------------------------------
-
-
--record(user_info, {
-
-    user_id = <<>> :: binary(),
-    username = <<>> :: binary(),
-    age = 0 :: integer(),
-    is_active = false :: boolean()
-}).
-
--record(query_request, {
-
-    query_id = <<>> :: binary(),
-    filters = [] :: list()
-}).
-
--record(query_response, {
-
-    results = [] :: list(),
-    count = 0 :: integer()
-}).
-
diff --git a/test/test_projects/diagnostics/.elp.toml b/test/test_projects/diagnostics/.elp.toml
deleted file mode 100644
index 504ef547af..0000000000
--- a/test/test_projects/diagnostics/.elp.toml
+++ /dev/null
@@ -1,8 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [ "root//diagnostics/..." ]
-source_root = "diagnostics"
-
-[eqwalizer]
-enable_all = false
diff --git a/test/test_projects/diagnostics/BUCK b/test/test_projects/diagnostics/BUCK
deleted file mode 100644
index 19c15e5acf..0000000000
--- a/test/test_projects/diagnostics/BUCK
+++ /dev/null
@@ -1,20 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "diagnostics_app_a_target",
-    srcs = glob(["app_a/src/*.erl"]),
-    app_name = "diagnostics_app_a",
-    app_src = "app_a/src/app_a.app.src",
-    applications = [
-    ],
-    includes = glob(["app_a/include/*.hrl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_tests(
-    suites = [
-        "app_a/test/app_a_SUITE.erl",
-    ],
-    deps = [":diagnostics_app_a_target"],
-)
diff --git a/test/test_projects/end_to_end/.elp.toml b/test/test_projects/end_to_end/.elp.toml
deleted file mode 100644
index acbcd6146f..0000000000
--- a/test/test_projects/end_to_end/.elp.toml
+++ /dev/null
@@ -1,7 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = ["root//end_to_end/..."]
-
-[eqwalizer]
-enable_all = false
diff --git a/test/test_projects/end_to_end/assist_examples/BUCK b/test/test_projects/end_to_end/assist_examples/BUCK
deleted file mode 100644
index 60d39de125..0000000000
--- a/test/test_projects/end_to_end/assist_examples/BUCK
+++ /dev/null
@@ -1,14 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "assist_examples",
-    srcs = glob([
-        "src/*.erl",
-    ]),
-    app_src = "src/assist_examples.app.src",
-    applications = [],
-    includes = [],
-    labels = ["user_application"],
-    version = "1.0.0",
-    visibility = ["PUBLIC"],
-)
diff --git a/test/test_projects/end_to_end/definitions/BUCK b/test/test_projects/end_to_end/definitions/BUCK
deleted file mode 100644
index c9e6b204f4..0000000000
--- a/test/test_projects/end_to_end/definitions/BUCK
+++ /dev/null
@@ -1,14 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "definitions",
-    srcs = glob([
-        "src/*.erl",
-    ]),
-    app_src = "src/definitions.app.src",
-    applications = [],
-    includes = [],
-    labels = ["user_application"],
-    version = "1.0.0",
-    visibility = ["PUBLIC"],
-)
diff --git a/test/test_projects/end_to_end/docs/BUCK b/test/test_projects/end_to_end/docs/BUCK
deleted file mode 100644
index 7429863b6e..0000000000
--- a/test/test_projects/end_to_end/docs/BUCK
+++ /dev/null
@@ -1,16 +0,0 @@
-load("@waserver//buck2/whatsapp:erlang.bzl", "erlang_application")
-
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "docs",
-    srcs = glob([
-        "src/*.erl",
-    ]),
-    app_src = "src/docs.app.src",
-    applications = [],
-    includes = [],
-    labels = ["user_application"],
-    version = "1.0.0",
-    visibility = ["PUBLIC"],
-)
diff --git a/test/test_projects/end_to_end/hover/BUCK b/test/test_projects/end_to_end/hover/BUCK
deleted file mode 100644
index 7732dc473e..0000000000
--- a/test/test_projects/end_to_end/hover/BUCK
+++ /dev/null
@@ -1,14 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "hover",
-    srcs = glob([
-        "src/*.erl",
-    ]),
-    app_src = "src/hover.app.src",
-    applications = [],
-    includes = [],
-    labels = ["user_application"],
-    version = "1.0.0",
-    visibility = ["PUBLIC"],
-)
diff --git a/test/test_projects/end_to_end/single_errors/BUCK b/test/test_projects/end_to_end/single_errors/BUCK
deleted file mode 100644
index a8f6e478b0..0000000000
--- a/test/test_projects/end_to_end/single_errors/BUCK
+++ /dev/null
@@ -1,14 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "single_errors",
-    srcs = glob([
-        "src/*.erl",
-    ]),
-    app_src = "src/single_errors.app.src",
-    applications = [],
-    includes = [],
-    labels = ["user_application"],
-    version = "1.0.0",
-    visibility = ["PUBLIC"],
-)
diff --git a/test/test_projects/eqwalizer_callers/.elp.toml b/test/test_projects/eqwalizer_callers/.elp.toml
deleted file mode 100644
index 68476bcf2e..0000000000
--- a/test/test_projects/eqwalizer_callers/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [ "root//eqwalizer_callers/..." ]
-source_root = "eqwalizer_callers"
diff --git a/test/test_projects/eqwalizer_callers/BUCK b/test/test_projects/eqwalizer_callers/BUCK
deleted file mode 100644
index 32012a0dc0..0000000000
--- a/test/test_projects/eqwalizer_callers/BUCK
+++ /dev/null
@@ -1,19 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "app_a",
-    srcs = glob(["app_a/src/*.erl"]),
-    app_src = "app_a/src/app_a.app.src",
-    applications = [
-    ],
-    includes = glob(["app_a/include/*.hrl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_tests(
-    suites = [
-        "app_a/test/app_a_SUITE.erl",
-    ],
-    deps = [":app_a"],
-)
diff --git a/test/test_projects/eqwalizer_tests/.elp.toml b/test/test_projects/eqwalizer_tests/.elp.toml
deleted file mode 100644
index 5dac3aa6a6..0000000000
--- a/test/test_projects/eqwalizer_tests/.elp.toml
+++ /dev/null
@@ -1,8 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [ "root//eqwalizer_tests/..." ]
-source_root = "eqwalizer_tests"
-
-[eqwalizer]
-enable_all = true
diff --git a/test/test_projects/eqwalizer_tests/BUCK b/test/test_projects/eqwalizer_tests/BUCK
deleted file mode 100644
index 0817873cb0..0000000000
--- a/test/test_projects/eqwalizer_tests/BUCK
+++ /dev/null
@@ -1,77 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "check",
-    srcs = glob(["check/src/**/*.erl"]),
-    applications = [":eqwalizer"],
-    includes = glob([
-        "check/include/*.hrl",
-        "eqwalizer/include/*.hrl",
-    ]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "check_gradual",
-    srcs = glob(["check_gradual/src/*.erl"]),
-    applications = [":eqwalizer"],
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_tests(
-    suites = [
-        "check/test/check_SUITE.erl",
-    ],
-    deps = [":check"],
-)
-
-erlang_application(
-    name = "debug",
-    srcs = glob(["debug/src/*.erl"]),
-    applications = [":eqwalizer"],
-    includes = glob(["debug/include/*.hrl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "elm_core",
-    srcs = glob(["elm_core/src/*.erl"]),
-    applications = [":eqwalizer"],
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "eqwater",
-    srcs = glob(["eqwater/src/*.erl"]),
-    applications = [":eqwalizer"],
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "fault_tolerance",
-    srcs = glob(["fault_tolerance/src/*.erl"]),
-    applications = [":eqwalizer"],
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "options",
-    srcs = glob(["options/src/*.erl"]),
-    applications = [":eqwalizer"],
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "eqwalizer",
-    srcs = glob(["eqwalizer/src/*.erl"]),
-    includes = glob(["eqwalizer/include/*.hrl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
diff --git a/test/test_projects/hierarchical_config/.elp.toml b/test/test_projects/hierarchical_config/.elp.toml
deleted file mode 100644
index e4d04eb6e0..0000000000
--- a/test/test_projects/hierarchical_config/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [ "root//hierarchical_config/..." ]
-source_root = "hierarchical_config"
diff --git a/test/test_projects/hierarchical_config/BUCK b/test/test_projects/hierarchical_config/BUCK
deleted file mode 100644
index bc78a42d57..0000000000
--- a/test/test_projects/hierarchical_config/BUCK
+++ /dev/null
@@ -1,23 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "app_a",
-    srcs = glob(["app_a/src/*.erl"]),
-    app_src = "app_a/src/app_a.app.src",
-    applications = [
-    ],
-    includes = glob(["app_a/include/*.hrl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "app_b",
-    srcs = glob(["app_b/src/*.erl"]),
-    app_src = "app_b/src/app_b.app.src",
-    applications = [
-    ],
-    includes = glob(["app_b/include/*.hrl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
diff --git a/test/test_projects/in_place_tests/.elp.toml b/test/test_projects/in_place_tests/.elp.toml
deleted file mode 100644
index 70edcc3f03..0000000000
--- a/test/test_projects/in_place_tests/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [ "root//in_place_tests/..." ]
-source_root = "in_place_tests"
diff --git a/test/test_projects/in_place_tests/BUCK b/test/test_projects/in_place_tests/BUCK
deleted file mode 100644
index f4f354e7ee..0000000000
--- a/test/test_projects/in_place_tests/BUCK
+++ /dev/null
@@ -1,19 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "in_place_tests_app_a",
-    srcs = glob(["app_a/src/*.erl"]),
-    app_src = "app_a/src/app_a.app.src",
-    applications = [
-    ],
-    includes = glob(["app_a/include/*.hrl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_tests(
-    suites = [
-        "app_a/test/app_a_SUITE.erl",
-    ],
-    deps = [":in_place_tests_app_a"],
-)
diff --git a/test/test_projects/include_lib_dependency_test/.elp.toml b/test/test_projects/include_lib_dependency_test/.elp.toml
deleted file mode 100644
index 9d1c859339..0000000000
--- a/test/test_projects/include_lib_dependency_test/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [ "root//include_lib_dependency_test/..." ]
-source_root = "include_lib_dependency_test"
diff --git a/test/test_projects/include_lib_dependency_test/BUCK b/test/test_projects/include_lib_dependency_test/BUCK
deleted file mode 100644
index 54b81c47b5..0000000000
--- a/test/test_projects/include_lib_dependency_test/BUCK
+++ /dev/null
@@ -1,43 +0,0 @@
-oncall("vscode_erlang")
-
-# Main application that will try to include_lib from an app it doesn't depend on
-erlang_application(
-    name = "main_app",
-    srcs = glob(["main_app/src/*.erl"]),
-    app_src = "main_app/src/main_app.app.src",
-    applications = [
-        # Note: deliberately NOT including :external_app as a dependency
-        "root//include_lib_dependency_test:normal_dep",
-    ],
-    extra_includes = ["root//include_lib_dependency_test:extra_app"],
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-# External application that main_app will try to include_lib from
-erlang_application(
-    name = "external_app",
-    srcs = glob(["external_app/src/*.erl"]),
-    app_src = "external_app/src/external_app.app.src",
-    includes = glob(["external_app/include/*.hrl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "extra_app",
-    srcs = glob(["extra_app/src/*.erl"]),
-    app_src = "extra_app/src/extra_app.app.src",
-    includes = glob(["extra_app/include/*.hrl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "normal_dep",
-    srcs = glob(["normal_dep/src/*.erl"]),
-    app_src = "normal_dep/src/normal_dep.app.src",
-    includes = glob(["normal_dep/include/*.hrl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
diff --git a/test/test_projects/linter/.elp.toml b/test/test_projects/linter/.elp.toml
deleted file mode 100644
index 4820625b2d..0000000000
--- a/test/test_projects/linter/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [ "root//linter/..." ]
-source_root = "linter"
diff --git a/test/test_projects/linter/BUCK b/test/test_projects/linter/BUCK
deleted file mode 100644
index 2db8750582..0000000000
--- a/test/test_projects/linter/BUCK
+++ /dev/null
@@ -1,41 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "app_a",
-    srcs = glob(["app_a/src/*.erl"]),
-    app_src = "app_a/src/app_a.app.src",
-    applications = [
-    ],
-    includes = glob(["app_a/include/*.hrl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "app_b",
-    srcs = glob(["app_b/src/*.erl"]),
-    app_src = "app_b/src/app_b.app.src",
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_tests(
-    suites = [
-        "app_a/test/app_a_SUITE.erl",
-    ],
-    deps = [":app_a"],
-)
-
-erlang_application(
-    name = "app_a_test_utils",
-    srcs = [
-        "app_a/test/app_a_test_helpers.erl",
-        "app_a/test/app_a_test_helpers_not_opted_in.erl",
-        "app_a/test/app_test_helpers_no_errors.erl",
-    ],
-    applications = [":app_a"],
-    labels = [
-        "test_application",
-        "test_utils",
-    ],
-)
diff --git a/test/test_projects/linter_bad_config/.elp.toml b/test/test_projects/linter_bad_config/.elp.toml
deleted file mode 100644
index 4820625b2d..0000000000
--- a/test/test_projects/linter_bad_config/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [ "root//linter/..." ]
-source_root = "linter"
diff --git a/test/test_projects/linter_bad_config/BUCK b/test/test_projects/linter_bad_config/BUCK
deleted file mode 100644
index a0817a6ad6..0000000000
--- a/test/test_projects/linter_bad_config/BUCK
+++ /dev/null
@@ -1,12 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "app_a",
-    srcs = glob(["app_a/src/*.erl"]),
-    app_src = "app_a/src/app_a.app.src",
-    applications = [
-    ],
-    includes = glob(["app_a/include/*.hrl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
diff --git a/test/test_projects/linter_bad_config/linter/.elp.toml b/test/test_projects/linter_bad_config/linter/.elp.toml
deleted file mode 100644
index 4820625b2d..0000000000
--- a/test/test_projects/linter_bad_config/linter/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [ "root//linter/..." ]
-source_root = "linter"
diff --git a/test/test_projects/linter_bad_config/linter/BUCK b/test/test_projects/linter_bad_config/linter/BUCK
deleted file mode 100644
index 2db8750582..0000000000
--- a/test/test_projects/linter_bad_config/linter/BUCK
+++ /dev/null
@@ -1,41 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "app_a",
-    srcs = glob(["app_a/src/*.erl"]),
-    app_src = "app_a/src/app_a.app.src",
-    applications = [
-    ],
-    includes = glob(["app_a/include/*.hrl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "app_b",
-    srcs = glob(["app_b/src/*.erl"]),
-    app_src = "app_b/src/app_b.app.src",
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_tests(
-    suites = [
-        "app_a/test/app_a_SUITE.erl",
-    ],
-    deps = [":app_a"],
-)
-
-erlang_application(
-    name = "app_a_test_utils",
-    srcs = [
-        "app_a/test/app_a_test_helpers.erl",
-        "app_a/test/app_a_test_helpers_not_opted_in.erl",
-        "app_a/test/app_test_helpers_no_errors.erl",
-    ],
-    applications = [":app_a"],
-    labels = [
-        "test_application",
-        "test_utils",
-    ],
-)
diff --git a/test/test_projects/linter_config/.elp.toml b/test/test_projects/linter_config/.elp.toml
deleted file mode 100644
index c490cc155e..0000000000
--- a/test/test_projects/linter_config/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [ "root//linter_config/..." ]
-source_root = "linter_config"
diff --git a/test/test_projects/linter_config/.elp_lint.toml b/test/test_projects/linter_config/.elp_lint.toml
deleted file mode 100644
index 47886dd507..0000000000
--- a/test/test_projects/linter_config/.elp_lint.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[linters.L1260] # Unused record, produced by the Erlang Service
-exclude_apps = ["app_b", "app_c"]
-
-[linters.unused_macro]
-exclude_apps = ["app_c"]
diff --git a/test/test_projects/linter_config/BUCK b/test/test_projects/linter_config/BUCK
deleted file mode 100644
index c1101daea2..0000000000
--- a/test/test_projects/linter_config/BUCK
+++ /dev/null
@@ -1,25 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "app_a",
-    srcs = glob(["app_a/src/*.erl"]),
-    app_src = "app_a/src/app_a.app.src",
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "app_b",
-    srcs = glob(["app_b/src/*.erl"]),
-    app_src = "app_b/src/app_b.app.src",
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "app_c",
-    srcs = glob(["app_c/src/*.erl"]),
-    app_src = "app_c/src/app_c.app.src",
-    labels = ["user_application"],
-    version = "1.0.0",
-)
diff --git a/test/test_projects/linter_config/app_a/src/app_a.erl b/test/test_projects/linter_config/app_a/src/app_a.erl
deleted file mode 100644
index c374c0b518..0000000000
--- a/test/test_projects/linter_config/app_a/src/app_a.erl
+++ /dev/null
@@ -1,4 +0,0 @@
--module(app_a).
-
--define(MACRO_A, a).
--record(rec_a, {a :: atom()}).
diff --git a/test/test_projects/linter_config/app_b/src/app_b.erl b/test/test_projects/linter_config/app_b/src/app_b.erl
deleted file mode 100644
index ca7ecf985b..0000000000
--- a/test/test_projects/linter_config/app_b/src/app_b.erl
+++ /dev/null
@@ -1,4 +0,0 @@
--module(app_b).
-
--define(MACRO_B, b).
--record(rec_b, {b :: atom()}).
diff --git a/test/test_projects/linter_config/app_c/src/app_c.app.src b/test/test_projects/linter_config/app_c/src/app_c.app.src
deleted file mode 100644
index c278bbce23..0000000000
--- a/test/test_projects/linter_config/app_c/src/app_c.app.src
+++ /dev/null
@@ -1,3 +0,0 @@
-{application, app_c,
-  [{description, "example app C"}, {vsn, "inplace"}, {applications, [kernel, stdlib]}]
-}.
diff --git a/test/test_projects/linter_config/app_c/src/app_c.erl b/test/test_projects/linter_config/app_c/src/app_c.erl
deleted file mode 100644
index 57573554b6..0000000000
--- a/test/test_projects/linter_config/app_c/src/app_c.erl
+++ /dev/null
@@ -1,4 +0,0 @@
--module(app_c).
-
--define(MACRO_C, c).
--record(rec_c, {c :: atom()}).
diff --git a/test/test_projects/linter_config/rebar.config b/test/test_projects/linter_config/rebar.config
deleted file mode 100644
index d508bd24de..0000000000
--- a/test/test_projects/linter_config/rebar.config
+++ /dev/null
@@ -1,9 +0,0 @@
-{checkouts_dir, ["."]}.
-{project_app_dirs, [
-    "app_a",
-    "app_b",
-    "app_c"
-]}.
-
-{erl_opts, [debug_info]}.
-{deps, []}.
diff --git a/test/test_projects/parse_error/.elp.toml b/test/test_projects/parse_error/.elp.toml
deleted file mode 100644
index 1a06a42f0d..0000000000
--- a/test/test_projects/parse_error/.elp.toml
+++ /dev/null
@@ -1,8 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [ "root//parse_error/..." ]
-source_root = "parse_error"
-
-[eqwalizer]
-enable_all = false
diff --git a/test/test_projects/parse_error/BUCK b/test/test_projects/parse_error/BUCK
deleted file mode 100644
index ed65c267d0..0000000000
--- a/test/test_projects/parse_error/BUCK
+++ /dev/null
@@ -1,9 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "elp_test_parse_a",
-    srcs = glob(["parse_error_a/src/*.erl"]),
-    app_src = "parse_error_a/src/parse_error_a.app.src",
-    labels = ["user_application"],
-    version = "1.0.0",
-)
diff --git a/test/test_projects/standard/.elp.toml b/test/test_projects/standard/.elp.toml
deleted file mode 100644
index f5e2ac1943..0000000000
--- a/test/test_projects/standard/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [ "root//standard/..." ]
-source_root = "standard"
diff --git a/test/test_projects/standard/BUCK b/test/test_projects/standard/BUCK
deleted file mode 100644
index 3f1e9ee947..0000000000
--- a/test/test_projects/standard/BUCK
+++ /dev/null
@@ -1,49 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "app_a",
-    srcs = glob(["app_a/src/*.erl"]),
-    app_src = "app_a/src/app_a.app.src",
-    applications = [
-    ],
-    includes = glob(["app_a/include/*.hrl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "elp_test_standard_app_b",
-    srcs = glob(["app_b/src/*.erl"]),
-    app_src = "app_b/src/app_b.app.src",
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "elp_test_eqwalizer",
-    srcs = glob(["eqwalizer/src/*.erl"]),
-    app_src = "eqwalizer/src/eqwalizer.app.src",
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_tests(
-    suites = [
-        "app_a/test/app_a_SUITE.erl",
-    ],
-    deps = [":app_a"],
-)
-
-erlang_application(
-    name = "app_a_test_utils",
-    srcs = [
-        "app_a/test/app_a_test_helpers.erl",
-        "app_a/test/app_a_test_helpers_not_opted_in.erl",
-        "app_a/test/app_test_helpers_no_errors.erl",
-    ],
-    applications = [":app_a"],
-    labels = [
-        "test_application",
-        "test_utils",
-    ],
-)
diff --git a/test/test_projects/standard/app_a/src/app_a.app.src b/test/test_projects/standard/app_a/src/app_a.app.src
deleted file mode 100644
index 1381435a46..0000000000
--- a/test/test_projects/standard/app_a/src/app_a.app.src
+++ /dev/null
@@ -1,3 +0,0 @@
-{application, app_a,
-  [{description, "example app A"}, {vsn, "inplace"}, {applications, [kernel, stdlib]}]
-}.
diff --git a/test/test_projects/standard/app_b/src/app_b.app.src b/test/test_projects/standard/app_b/src/app_b.app.src
deleted file mode 100644
index 4112b4129f..0000000000
--- a/test/test_projects/standard/app_b/src/app_b.app.src
+++ /dev/null
@@ -1,3 +0,0 @@
-{application, app_b,
-  [{description, "example app B"}, {vsn, "inplace"}, {applications, [kernel, stdlib]}]
-}.
diff --git a/test/test_projects/toolchains/BUCK b/test/test_projects/toolchains/BUCK
deleted file mode 100644
index 770ac61f67..0000000000
--- a/test/test_projects/toolchains/BUCK
+++ /dev/null
@@ -1,5 +0,0 @@
-load("@prelude//toolchains:demo.bzl", "system_demo_toolchains")
-
-oncall("vscode_erlang")
-
-system_demo_toolchains()
diff --git a/test/test_projects/xref/.elp.toml b/test/test_projects/xref/.elp.toml
deleted file mode 100644
index 87c2f17334..0000000000
--- a/test/test_projects/xref/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [ "root//xref/..." ]
-source_root = "xref"
diff --git a/test/test_projects/xref/BUCK b/test/test_projects/xref/BUCK
deleted file mode 100644
index bf44968f02..0000000000
--- a/test/test_projects/xref/BUCK
+++ /dev/null
@@ -1,25 +0,0 @@
-oncall("vscode_erlang")
-
-erlang_application(
-    name = "app_a",
-    srcs = glob(["app_a/src/*.erl"]),
-    applications = [
-        ":app_b",
-    ],
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "app_b",
-    srcs = glob(["app_b/src/*.erl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
-
-erlang_application(
-    name = "app_c",
-    srcs = glob(["app_c/src/*.erl"]),
-    labels = ["user_application"],
-    version = "1.0.0",
-)
diff --git a/test/test_projects/.gitignore b/test_projects/.gitignore
similarity index 85%
rename from test/test_projects/.gitignore
rename to test_projects/.gitignore
index 2672c17cc4..b34578734c 100644
--- a/test/test_projects/.gitignore
+++ b/test_projects/.gitignore
@@ -3,4 +3,3 @@
 *wa.build_info
 *_build/
 *rebar.lock
-buck-out/
diff --git a/test/test_projects/README.md b/test_projects/README.md
similarity index 100%
rename from test/test_projects/README.md
rename to test_projects/README.md
diff --git a/test_projects/buck_bad_config/.elp.toml b/test_projects/buck_bad_config/.elp.toml
new file mode 100644
index 0000000000..a891a3dfc5
--- /dev/null
+++ b/test_projects/buck_bad_config/.elp.toml
@@ -0,0 +1,8 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "fbcode//whatsapp/elp/test_projects/buck_bad_config/..." ]
+source_root = "whatsapp/elp/test_projects/buck_bad_config"
+
+[eqwalizer]
+enable_all = false
diff --git a/test/test_projects/buck_bad_config/src/bad_app.erl b/test_projects/buck_bad_config/src/bad_app.erl
similarity index 100%
rename from test/test_projects/buck_bad_config/src/bad_app.erl
rename to test_projects/buck_bad_config/src/bad_app.erl
diff --git a/test_projects/buck_tests/.elp.toml b/test_projects/buck_tests/.elp.toml
new file mode 100644
index 0000000000..acb0799975
--- /dev/null
+++ b/test_projects/buck_tests/.elp.toml
@@ -0,0 +1,9 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "fbcode//whatsapp/elp/test_projects/buck_tests/..." ]
+excluded_targets = [ "fbcode//whatsapp/elp/test_projects/buck_tests:test_elp_ignored" ]
+source_root = "whatsapp/elp/test_projects/buck_tests"
+
+[eqwalizer]
+enable_all = false
diff --git a/test/test_projects/buck_tests/TARGETS.v2_ b/test_projects/buck_tests/TARGETS.v2_
similarity index 100%
rename from test/test_projects/buck_tests/TARGETS.v2_
rename to test_projects/buck_tests/TARGETS.v2_
diff --git a/test/test_projects/buck_tests/test_elp/TARGETS.v2_ b/test_projects/buck_tests/test_elp/TARGETS.v2_
similarity index 77%
rename from test/test_projects/buck_tests/test_elp/TARGETS.v2_
rename to test_projects/buck_tests/test_elp/TARGETS.v2_
index 7e5bd95db5..83089813da 100644
--- a/test/test_projects/buck_tests/test_elp/TARGETS.v2_
+++ b/test_projects/buck_tests/test_elp/TARGETS.v2_
@@ -7,11 +7,11 @@ erlang_application(
     ]),
     app_src = "src/test_elp.app.src",
     applications = [
-        "//buck_tests/test_elp_direct_dep:test_elp_direct_dep",
-        "//buck_tests:test_elp_no_private_headers",
-        "//buck_tests:test_elp_no_public_headers",
-        "//buck_tests:test_elp_flat_outside_target",
-        "//buck_tests/test_elp_flat_inside_target:test_elp_flat_inside_target",
+        "//whatsapp/elp/test_projects/buck_tests/test_elp_direct_dep:test_elp_direct_dep",
+        "//whatsapp/elp/test_projects/buck_tests:test_elp_no_private_headers",
+        "//whatsapp/elp/test_projects/buck_tests:test_elp_no_public_headers",
+        "//whatsapp/elp/test_projects/buck_tests:test_elp_flat_outside_target",
+        "//whatsapp/elp/test_projects/buck_tests/test_elp_flat_inside_target:test_elp_flat_inside_target",
     ],
     includes = glob(["include/*.hrl"]),
     version = "1.0.0",
diff --git a/test/test_projects/buck_tests/test_elp/include/test_elp.hrl b/test_projects/buck_tests/test_elp/include/test_elp.hrl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp/include/test_elp.hrl
rename to test_projects/buck_tests/test_elp/include/test_elp.hrl
diff --git a/test/test_projects/buck_tests/test_elp/src/test_elp.app.src b/test_projects/buck_tests/test_elp/src/test_elp.app.src
similarity index 100%
rename from test/test_projects/buck_tests/test_elp/src/test_elp.app.src
rename to test_projects/buck_tests/test_elp/src/test_elp.app.src
diff --git a/test/test_projects/buck_tests/test_elp/src/test_elp.erl b/test_projects/buck_tests/test_elp/src/test_elp.erl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp/src/test_elp.erl
rename to test_projects/buck_tests/test_elp/src/test_elp.erl
diff --git a/test/test_projects/buck_tests/test_elp/test/test_elp_SUITE.erl b/test_projects/buck_tests/test_elp/test/test_elp_SUITE.erl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp/test/test_elp_SUITE.erl
rename to test_projects/buck_tests/test_elp/test/test_elp_SUITE.erl
diff --git a/test/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/handle_update_test1.json b/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/handle_update_test1.json
similarity index 100%
rename from test/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/handle_update_test1.json
rename to test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/handle_update_test1.json
diff --git a/test/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/handle_update_test2.json b/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/handle_update_test2.json
similarity index 100%
rename from test/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/handle_update_test2.json
rename to test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/handle_update_test2.json
diff --git a/test/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/untracked_header.hrl b/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/untracked_header.hrl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/untracked_header.hrl
rename to test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/untracked_header.hrl
diff --git a/test/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/untracked_module.erl b/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/untracked_module.erl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/untracked_module.erl
rename to test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/untracked_module.erl
diff --git a/test/test_projects/buck_tests/test_elp/test/test_elp_test_utils.erl b/test_projects/buck_tests/test_elp/test/test_elp_test_utils.erl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp/test/test_elp_test_utils.erl
rename to test_projects/buck_tests/test_elp/test/test_elp_test_utils.erl
diff --git a/test/test_projects/buck_tests/test_elp/test/test_elp_test_utils.hrl b/test_projects/buck_tests/test_elp/test/test_elp_test_utils.hrl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp/test/test_elp_test_utils.hrl
rename to test_projects/buck_tests/test_elp/test/test_elp_test_utils.hrl
diff --git a/test/test_projects/buck_tests/test_elp_direct_dep/TARGETS.v2_ b/test_projects/buck_tests/test_elp_direct_dep/TARGETS.v2_
similarity index 62%
rename from test/test_projects/buck_tests/test_elp_direct_dep/TARGETS.v2_
rename to test_projects/buck_tests/test_elp_direct_dep/TARGETS.v2_
index a752b99087..d0fea8149b 100644
--- a/test/test_projects/buck_tests/test_elp_direct_dep/TARGETS.v2_
+++ b/test_projects/buck_tests/test_elp_direct_dep/TARGETS.v2_
@@ -5,10 +5,10 @@ erlang_application(
         "src/*.hrl",
     ]),
     applications = [
-        "//buck_tests/test_elp_transitive_dep:test_elp_transitive_dep",
+        "//whatsapp/elp/test_projects/buck_tests/test_elp_transitive_dep:test_elp_transitive_dep",
     ],
     extra_includes = [
-        "//buck_tests/test_elp:test_elp",
+        "//whatsapp/elp/test_projects/buck_tests/test_elp:test_elp",
     ],
     includes = glob(["include/*.hrl"]),
     version = "1.0.0",
diff --git a/test/test_projects/buck_tests/test_elp_direct_dep/include/test_elp_direct_dep.hrl b/test_projects/buck_tests/test_elp_direct_dep/include/test_elp_direct_dep.hrl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp_direct_dep/include/test_elp_direct_dep.hrl
rename to test_projects/buck_tests/test_elp_direct_dep/include/test_elp_direct_dep.hrl
diff --git a/test/test_projects/buck_tests/test_elp_direct_dep/src/test_elp_direct_dep.erl b/test_projects/buck_tests/test_elp_direct_dep/src/test_elp_direct_dep.erl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp_direct_dep/src/test_elp_direct_dep.erl
rename to test_projects/buck_tests/test_elp_direct_dep/src/test_elp_direct_dep.erl
diff --git a/test/test_projects/buck_tests/test_elp_direct_dep/src/test_elp_direct_dep_private.hrl b/test_projects/buck_tests/test_elp_direct_dep/src/test_elp_direct_dep_private.hrl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp_direct_dep/src/test_elp_direct_dep_private.hrl
rename to test_projects/buck_tests/test_elp_direct_dep/src/test_elp_direct_dep_private.hrl
diff --git a/test/test_projects/buck_tests/test_elp_flat_inside_target/TARGETS.v2_ b/test_projects/buck_tests/test_elp_flat_inside_target/TARGETS.v2_
similarity index 100%
rename from test/test_projects/buck_tests/test_elp_flat_inside_target/TARGETS.v2_
rename to test_projects/buck_tests/test_elp_flat_inside_target/TARGETS.v2_
diff --git a/test/test_projects/buck_tests/test_elp_flat_inside_target/test_elp_flat_inside_target.erl b/test_projects/buck_tests/test_elp_flat_inside_target/test_elp_flat_inside_target.erl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp_flat_inside_target/test_elp_flat_inside_target.erl
rename to test_projects/buck_tests/test_elp_flat_inside_target/test_elp_flat_inside_target.erl
diff --git a/test/test_projects/buck_tests/test_elp_flat_inside_target/test_elp_flat_inside_target.hrl b/test_projects/buck_tests/test_elp_flat_inside_target/test_elp_flat_inside_target.hrl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp_flat_inside_target/test_elp_flat_inside_target.hrl
rename to test_projects/buck_tests/test_elp_flat_inside_target/test_elp_flat_inside_target.hrl
diff --git a/test/test_projects/buck_tests/test_elp_flat_outside_target/test_elp_flat_outside_target.erl b/test_projects/buck_tests/test_elp_flat_outside_target/test_elp_flat_outside_target.erl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp_flat_outside_target/test_elp_flat_outside_target.erl
rename to test_projects/buck_tests/test_elp_flat_outside_target/test_elp_flat_outside_target.erl
diff --git a/test/test_projects/buck_tests/test_elp_flat_outside_target/test_elp_flat_outside_target.hrl b/test_projects/buck_tests/test_elp_flat_outside_target/test_elp_flat_outside_target.hrl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp_flat_outside_target/test_elp_flat_outside_target.hrl
rename to test_projects/buck_tests/test_elp_flat_outside_target/test_elp_flat_outside_target.hrl
diff --git a/test/test_projects/buck_tests/test_elp_ignored/test_elp_ignored.erl b/test_projects/buck_tests/test_elp_ignored/test_elp_ignored.erl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp_ignored/test_elp_ignored.erl
rename to test_projects/buck_tests/test_elp_ignored/test_elp_ignored.erl
diff --git a/test/test_projects/buck_tests/test_elp_no_private_headers/include/test_elp_no_private_headers.hrl b/test_projects/buck_tests/test_elp_no_private_headers/include/test_elp_no_private_headers.hrl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp_no_private_headers/include/test_elp_no_private_headers.hrl
rename to test_projects/buck_tests/test_elp_no_private_headers/include/test_elp_no_private_headers.hrl
diff --git a/test/test_projects/buck_tests/test_elp_no_private_headers/src/test_elp_no_private_headers.erl b/test_projects/buck_tests/test_elp_no_private_headers/src/test_elp_no_private_headers.erl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp_no_private_headers/src/test_elp_no_private_headers.erl
rename to test_projects/buck_tests/test_elp_no_private_headers/src/test_elp_no_private_headers.erl
diff --git a/test/test_projects/buck_tests/test_elp_no_public_headers/src/test_elp_no_headers.erl b/test_projects/buck_tests/test_elp_no_public_headers/src/test_elp_no_headers.erl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp_no_public_headers/src/test_elp_no_headers.erl
rename to test_projects/buck_tests/test_elp_no_public_headers/src/test_elp_no_headers.erl
diff --git a/test/test_projects/buck_tests/test_elp_transitive_dep/TARGETS.v2_ b/test_projects/buck_tests/test_elp_transitive_dep/TARGETS.v2_
similarity index 100%
rename from test/test_projects/buck_tests/test_elp_transitive_dep/TARGETS.v2_
rename to test_projects/buck_tests/test_elp_transitive_dep/TARGETS.v2_
diff --git a/test/test_projects/buck_tests/test_elp_transitive_dep/include/test_elp_transitive_dep.hrl b/test_projects/buck_tests/test_elp_transitive_dep/include/test_elp_transitive_dep.hrl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp_transitive_dep/include/test_elp_transitive_dep.hrl
rename to test_projects/buck_tests/test_elp_transitive_dep/include/test_elp_transitive_dep.hrl
diff --git a/test/test_projects/buck_tests/test_elp_transitive_dep/src/test_elp_transitive_dep.erl b/test_projects/buck_tests/test_elp_transitive_dep/src/test_elp_transitive_dep.erl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp_transitive_dep/src/test_elp_transitive_dep.erl
rename to test_projects/buck_tests/test_elp_transitive_dep/src/test_elp_transitive_dep.erl
diff --git a/test/test_projects/buck_tests/test_elp_transitive_dep/src/test_elp_transitive_dep_private.hrl b/test_projects/buck_tests/test_elp_transitive_dep/src/test_elp_transitive_dep_private.hrl
similarity index 100%
rename from test/test_projects/buck_tests/test_elp_transitive_dep/src/test_elp_transitive_dep_private.hrl
rename to test_projects/buck_tests/test_elp_transitive_dep/src/test_elp_transitive_dep_private.hrl
diff --git a/test_projects/buck_tests_2/.elp.toml b/test_projects/buck_tests_2/.elp.toml
new file mode 100644
index 0000000000..35f02a72f3
--- /dev/null
+++ b/test_projects/buck_tests_2/.elp.toml
@@ -0,0 +1,12 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [
+    "fbcode//whatsapp/elp/test_projects/buck_tests_2/util/app_a/...",
+    "fbcode//whatsapp/elp/test_projects/buck_tests_2:check_include"
+    ]
+excluded_targets = [ "fbcode//whatsapp/elp/test_projects/buck_tests_2:test_elp_ignored" ]
+source_root = "whatsapp/elp/test_projects/buck_tests_2"
+
+[eqwalizer]
+enable_all = false
diff --git a/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/include/auto_gen_a.hrl b/test_projects/buck_tests_2/auto_gen/auto_gen_a/include/auto_gen_a.hrl
similarity index 100%
rename from test/test_projects/buck_tests_2/auto_gen/auto_gen_a/include/auto_gen_a.hrl
rename to test_projects/buck_tests_2/auto_gen/auto_gen_a/include/auto_gen_a.hrl
diff --git a/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/out/pretend_generated.erl b/test_projects/buck_tests_2/auto_gen/auto_gen_a/out/pretend_generated.erl
similarity index 100%
rename from test/test_projects/buck_tests_2/auto_gen/auto_gen_a/out/pretend_generated.erl
rename to test_projects/buck_tests_2/auto_gen/auto_gen_a/out/pretend_generated.erl
diff --git a/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/src/auto_gen_a.erl b/test_projects/buck_tests_2/auto_gen/auto_gen_a/src/auto_gen_a.erl
similarity index 100%
rename from test/test_projects/buck_tests_2/auto_gen/auto_gen_a/src/auto_gen_a.erl
rename to test_projects/buck_tests_2/auto_gen/auto_gen_a/src/auto_gen_a.erl
diff --git a/test/test_projects/buck_tests_2/check_include/src/top_includer.erl b/test_projects/buck_tests_2/check_include/src/top_includer.erl
similarity index 100%
rename from test/test_projects/buck_tests_2/check_include/src/top_includer.erl
rename to test_projects/buck_tests_2/check_include/src/top_includer.erl
diff --git a/test/test_projects/buck_tests_2/check_include_separate_1/include/include_with_bug.hrl b/test_projects/buck_tests_2/check_include_separate_1/include/include_with_bug.hrl
similarity index 100%
rename from test/test_projects/buck_tests_2/check_include_separate_1/include/include_with_bug.hrl
rename to test_projects/buck_tests_2/check_include_separate_1/include/include_with_bug.hrl
diff --git a/test/test_projects/buck_tests_2/check_include_separate_1/include/top_includer.hrl b/test_projects/buck_tests_2/check_include_separate_1/include/top_includer.hrl
similarity index 100%
rename from test/test_projects/buck_tests_2/check_include_separate_1/include/top_includer.hrl
rename to test_projects/buck_tests_2/check_include_separate_1/include/top_includer.hrl
diff --git a/test/test_projects/buck_tests_2/check_include_separate_2/include/separate_include.hrl b/test_projects/buck_tests_2/check_include_separate_2/include/separate_include.hrl
similarity index 100%
rename from test/test_projects/buck_tests_2/check_include_separate_2/include/separate_include.hrl
rename to test_projects/buck_tests_2/check_include_separate_2/include/separate_include.hrl
diff --git a/test/test_projects/buck_tests_2/generated/out/generated_header.hrl b/test_projects/buck_tests_2/generated/out/generated_header.hrl
similarity index 100%
rename from test/test_projects/buck_tests_2/generated/out/generated_header.hrl
rename to test_projects/buck_tests_2/generated/out/generated_header.hrl
diff --git a/test/test_projects/buck_tests_2/util/app_a/include/junk.hrl b/test_projects/buck_tests_2/util/app_a/include/junk.hrl
similarity index 100%
rename from test/test_projects/buck_tests_2/util/app_a/include/junk.hrl
rename to test_projects/buck_tests_2/util/app_a/include/junk.hrl
diff --git a/test/test_projects/buck_tests_2/util/app_a/src/app_a.erl b/test_projects/buck_tests_2/util/app_a/src/app_a.erl
similarity index 100%
rename from test/test_projects/buck_tests_2/util/app_a/src/app_a.erl
rename to test_projects/buck_tests_2/util/app_a/src/app_a.erl
diff --git a/test/test_projects/custom_build_tool/.elp.toml b/test_projects/custom_build_tool/.elp.toml
similarity index 100%
rename from test/test_projects/custom_build_tool/.elp.toml
rename to test_projects/custom_build_tool/.elp.toml
diff --git a/test/test_projects/custom_build_tool/apps/app_a/include/app_a.hrl b/test_projects/custom_build_tool/apps/app_a/include/app_a.hrl
similarity index 100%
rename from test/test_projects/custom_build_tool/apps/app_a/include/app_a.hrl
rename to test_projects/custom_build_tool/apps/app_a/include/app_a.hrl
diff --git a/test/test_projects/custom_build_tool/apps/app_a/src/app_a.erl b/test_projects/custom_build_tool/apps/app_a/src/app_a.erl
similarity index 100%
rename from test/test_projects/custom_build_tool/apps/app_a/src/app_a.erl
rename to test_projects/custom_build_tool/apps/app_a/src/app_a.erl
diff --git a/test/test_projects/custom_build_tool/apps/app_b/src/app_b.erl b/test_projects/custom_build_tool/apps/app_b/src/app_b.erl
similarity index 100%
rename from test/test_projects/custom_build_tool/apps/app_b/src/app_b.erl
rename to test_projects/custom_build_tool/apps/app_b/src/app_b.erl
diff --git a/test_projects/diagnostics/.elp.toml b/test_projects/diagnostics/.elp.toml
new file mode 100644
index 0000000000..e5ee70c992
--- /dev/null
+++ b/test_projects/diagnostics/.elp.toml
@@ -0,0 +1,8 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "fbcode//whatsapp/elp/test_projects/diagnostics/..." ]
+source_root = "whatsapp/elp/test_projects/diagnostics"
+
+[eqwalizer]
+enable_all = false
diff --git a/test/test_projects/diagnostics/README.md b/test_projects/diagnostics/README.md
similarity index 100%
rename from test/test_projects/diagnostics/README.md
rename to test_projects/diagnostics/README.md
diff --git a/test/test_projects/diagnostics/app_a/extra/app_a.erl b/test_projects/diagnostics/app_a/extra/app_a.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/extra/app_a.erl
rename to test_projects/diagnostics/app_a/extra/app_a.erl
diff --git a/test/test_projects/diagnostics/app_a/include/app_a.hrl b/test_projects/diagnostics/app_a/include/app_a.hrl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/include/app_a.hrl
rename to test_projects/diagnostics/app_a/include/app_a.hrl
diff --git a/test/test_projects/diagnostics/app_a/include/broken_diagnostics.hrl b/test_projects/diagnostics/app_a/include/broken_diagnostics.hrl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/include/broken_diagnostics.hrl
rename to test_projects/diagnostics/app_a/include/broken_diagnostics.hrl
diff --git a/test/test_projects/diagnostics/app_a/include/diagnostics.hrl b/test_projects/diagnostics/app_a/include/diagnostics.hrl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/include/diagnostics.hrl
rename to test_projects/diagnostics/app_a/include/diagnostics.hrl
diff --git a/test/test_projects/diagnostics/app_a/src/app_a.app.src b/test_projects/diagnostics/app_a/src/app_a.app.src
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/app_a.app.src
rename to test_projects/diagnostics/app_a/src/app_a.app.src
diff --git a/test/test_projects/diagnostics/app_a/src/app_a.erl b/test_projects/diagnostics/app_a/src/app_a.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/app_a.erl
rename to test_projects/diagnostics/app_a/src/app_a.erl
diff --git a/test/test_projects/diagnostics/app_a/src/broken_parse_trans.erl b/test_projects/diagnostics/app_a/src/broken_parse_trans.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/broken_parse_trans.erl
rename to test_projects/diagnostics/app_a/src/broken_parse_trans.erl
diff --git a/test/test_projects/diagnostics/app_a/src/cascading.erl b/test_projects/diagnostics/app_a/src/cascading.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/cascading.erl
rename to test_projects/diagnostics/app_a/src/cascading.erl
diff --git a/test/test_projects/diagnostics/app_a/src/crlf.erl b/test_projects/diagnostics/app_a/src/crlf.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/crlf.erl
rename to test_projects/diagnostics/app_a/src/crlf.erl
diff --git a/test/test_projects/diagnostics/app_a/src/diagnostics.erl b/test_projects/diagnostics/app_a/src/diagnostics.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/diagnostics.erl
rename to test_projects/diagnostics/app_a/src/diagnostics.erl
diff --git a/test/test_projects/diagnostics/app_a/src/diagnostics.escript b/test_projects/diagnostics/app_a/src/diagnostics.escript
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/diagnostics.escript
rename to test_projects/diagnostics/app_a/src/diagnostics.escript
diff --git a/test/test_projects/diagnostics/app_a/src/diagnostics_errors.escript b/test_projects/diagnostics/app_a/src/diagnostics_errors.escript
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/diagnostics_errors.escript
rename to test_projects/diagnostics/app_a/src/diagnostics_errors.escript
diff --git a/test/test_projects/diagnostics/app_a/src/diagnostics_warnings.escript b/test_projects/diagnostics/app_a/src/diagnostics_warnings.escript
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/diagnostics_warnings.escript
rename to test_projects/diagnostics/app_a/src/diagnostics_warnings.escript
diff --git a/test/test_projects/diagnostics/app_a/src/erlang_diagnostics_errors_gen.erl b/test_projects/diagnostics/app_a/src/erlang_diagnostics_errors_gen.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/erlang_diagnostics_errors_gen.erl
rename to test_projects/diagnostics/app_a/src/erlang_diagnostics_errors_gen.erl
diff --git a/test/test_projects/diagnostics/app_a/src/file_attribute.erl b/test_projects/diagnostics/app_a/src/file_attribute.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/file_attribute.erl
rename to test_projects/diagnostics/app_a/src/file_attribute.erl
diff --git a/test/test_projects/diagnostics/app_a/src/lint_recursive.erl b/test_projects/diagnostics/app_a/src/lint_recursive.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/lint_recursive.erl
rename to test_projects/diagnostics/app_a/src/lint_recursive.erl
diff --git a/test/test_projects/diagnostics/app_a/src/lints.erl b/test_projects/diagnostics/app_a/src/lints.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/lints.erl
rename to test_projects/diagnostics/app_a/src/lints.erl
diff --git a/test/test_projects/diagnostics/app_a/src/otp27_docstrings.erl b/test_projects/diagnostics/app_a/src/otp27_docstrings.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/otp27_docstrings.erl
rename to test_projects/diagnostics/app_a/src/otp27_docstrings.erl
diff --git a/test/test_projects/diagnostics/app_a/src/otp27_sigils.erl b/test_projects/diagnostics/app_a/src/otp27_sigils.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/otp27_sigils.erl
rename to test_projects/diagnostics/app_a/src/otp27_sigils.erl
diff --git a/test/test_projects/diagnostics/app_a/src/otp_7655.erl b/test_projects/diagnostics/app_a/src/otp_7655.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/otp_7655.erl
rename to test_projects/diagnostics/app_a/src/otp_7655.erl
diff --git a/test/test_projects/diagnostics/app_a/src/parse_error_a_cascade.erl b/test_projects/diagnostics/app_a/src/parse_error_a_cascade.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/parse_error_a_cascade.erl
rename to test_projects/diagnostics/app_a/src/parse_error_a_cascade.erl
diff --git a/test/test_projects/diagnostics/app_a/src/suppressed.erl b/test_projects/diagnostics/app_a/src/suppressed.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/suppressed.erl
rename to test_projects/diagnostics/app_a/src/suppressed.erl
diff --git a/test/test_projects/diagnostics/app_a/src/syntax.erl b/test_projects/diagnostics/app_a/src/syntax.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/src/syntax.erl
rename to test_projects/diagnostics/app_a/src/syntax.erl
diff --git a/test/test_projects/diagnostics/app_a/test/app_a_SUITE.erl b/test_projects/diagnostics/app_a/test/app_a_SUITE.erl
similarity index 100%
rename from test/test_projects/diagnostics/app_a/test/app_a_SUITE.erl
rename to test_projects/diagnostics/app_a/test/app_a_SUITE.erl
diff --git a/test/test_projects/diagnostics/erlang_ls.config b/test_projects/diagnostics/erlang_ls.config
similarity index 100%
rename from test/test_projects/diagnostics/erlang_ls.config
rename to test_projects/diagnostics/erlang_ls.config
diff --git a/test/test_projects/diagnostics/rebar.config b/test_projects/diagnostics/rebar.config
similarity index 100%
rename from test/test_projects/diagnostics/rebar.config
rename to test_projects/diagnostics/rebar.config
diff --git a/test/test_projects/diagnostics/test_build_info.json b/test_projects/diagnostics/test_build_info.json
similarity index 100%
rename from test/test_projects/diagnostics/test_build_info.json
rename to test_projects/diagnostics/test_build_info.json
diff --git a/test/test_projects/codegen_test/.elp.toml b/test_projects/end_to_end/.elp.toml
similarity index 50%
rename from test/test_projects/codegen_test/.elp.toml
rename to test_projects/end_to_end/.elp.toml
index f21fe1bc73..f015956e45 100644
--- a/test/test_projects/codegen_test/.elp.toml
+++ b/test_projects/end_to_end/.elp.toml
@@ -1,7 +1,7 @@
 [buck]
 enabled = true
 build_deps = false
-included_targets = ["root//codegen_test/..."]
+included_targets = ["fbcode//whatsapp/elp/test_projects/end_to_end/..."]
 
 [eqwalizer]
 enable_all = false
diff --git a/test/test_projects/end_to_end/assist_examples/src/add_doc.erl b/test_projects/end_to_end/assist_examples/src/add_doc.erl
similarity index 100%
rename from test/test_projects/end_to_end/assist_examples/src/add_doc.erl
rename to test_projects/end_to_end/assist_examples/src/add_doc.erl
diff --git a/test/test_projects/end_to_end/assist_examples/src/assist_examples.app.src b/test_projects/end_to_end/assist_examples/src/assist_examples.app.src
similarity index 100%
rename from test/test_projects/end_to_end/assist_examples/src/assist_examples.app.src
rename to test_projects/end_to_end/assist_examples/src/assist_examples.app.src
diff --git a/test/test_projects/end_to_end/assist_examples/src/code_completion.erl b/test_projects/end_to_end/assist_examples/src/code_completion.erl
similarity index 100%
rename from test/test_projects/end_to_end/assist_examples/src/code_completion.erl
rename to test_projects/end_to_end/assist_examples/src/code_completion.erl
diff --git a/test/test_projects/end_to_end/assist_examples/src/extract_function.erl b/test_projects/end_to_end/assist_examples/src/extract_function.erl
similarity index 100%
rename from test/test_projects/end_to_end/assist_examples/src/extract_function.erl
rename to test_projects/end_to_end/assist_examples/src/extract_function.erl
diff --git a/test/test_projects/end_to_end/assist_examples/src/head_mismatch.erl b/test_projects/end_to_end/assist_examples/src/head_mismatch.erl
similarity index 100%
rename from test/test_projects/end_to_end/assist_examples/src/head_mismatch.erl
rename to test_projects/end_to_end/assist_examples/src/head_mismatch.erl
diff --git a/test/test_projects/end_to_end/caf/configerator/source/whatsapp/my_caf.erl b/test_projects/end_to_end/caf/configerator/source/whatsapp/my_caf.erl
similarity index 100%
rename from test/test_projects/end_to_end/caf/configerator/source/whatsapp/my_caf.erl
rename to test_projects/end_to_end/caf/configerator/source/whatsapp/my_caf.erl
diff --git a/test/test_projects/end_to_end/definitions/README.md b/test_projects/end_to_end/definitions/README.md
similarity index 100%
rename from test/test_projects/end_to_end/definitions/README.md
rename to test_projects/end_to_end/definitions/README.md
diff --git a/test/test_projects/end_to_end/definitions/src/definitions.app.src b/test_projects/end_to_end/definitions/src/definitions.app.src
similarity index 100%
rename from test/test_projects/end_to_end/definitions/src/definitions.app.src
rename to test_projects/end_to_end/definitions/src/definitions.app.src
diff --git a/test/test_projects/end_to_end/definitions/src/local_def.erl b/test_projects/end_to_end/definitions/src/local_def.erl
similarity index 100%
rename from test/test_projects/end_to_end/definitions/src/local_def.erl
rename to test_projects/end_to_end/definitions/src/local_def.erl
diff --git a/test/test_projects/end_to_end/docs/src/docs.app.src b/test_projects/end_to_end/docs/src/docs.app.src
similarity index 100%
rename from test/test_projects/end_to_end/docs/src/docs.app.src
rename to test_projects/end_to_end/docs/src/docs.app.src
diff --git a/test/test_projects/end_to_end/docs/src/docs.erl b/test_projects/end_to_end/docs/src/docs.erl
similarity index 100%
rename from test/test_projects/end_to_end/docs/src/docs.erl
rename to test_projects/end_to_end/docs/src/docs.erl
diff --git a/test/test_projects/end_to_end/erlang_ls.config b/test_projects/end_to_end/erlang_ls.config
similarity index 100%
rename from test/test_projects/end_to_end/erlang_ls.config
rename to test_projects/end_to_end/erlang_ls.config
diff --git a/test/test_projects/end_to_end/fixtures/erlang-stacktrace.txt b/test_projects/end_to_end/fixtures/erlang-stacktrace.txt
similarity index 100%
rename from test/test_projects/end_to_end/fixtures/erlang-stacktrace.txt
rename to test_projects/end_to_end/fixtures/erlang-stacktrace.txt
diff --git a/test/test_projects/end_to_end/hover/README.md b/test_projects/end_to_end/hover/README.md
similarity index 100%
rename from test/test_projects/end_to_end/hover/README.md
rename to test_projects/end_to_end/hover/README.md
diff --git a/test/test_projects/end_to_end/hover/src/doc_examples.erl b/test_projects/end_to_end/hover/src/doc_examples.erl
similarity index 100%
rename from test/test_projects/end_to_end/hover/src/doc_examples.erl
rename to test_projects/end_to_end/hover/src/doc_examples.erl
diff --git a/test/test_projects/end_to_end/hover/src/hover.app.src b/test_projects/end_to_end/hover/src/hover.app.src
similarity index 100%
rename from test/test_projects/end_to_end/hover/src/hover.app.src
rename to test_projects/end_to_end/hover/src/hover.app.src
diff --git a/test/test_projects/end_to_end/rebar.config b/test_projects/end_to_end/rebar.config
similarity index 100%
rename from test/test_projects/end_to_end/rebar.config
rename to test_projects/end_to_end/rebar.config
diff --git a/test/test_projects/end_to_end/single_errors/README.md b/test_projects/end_to_end/single_errors/README.md
similarity index 100%
rename from test/test_projects/end_to_end/single_errors/README.md
rename to test_projects/end_to_end/single_errors/README.md
diff --git a/test/test_projects/end_to_end/single_errors/src/as_you_type.erl b/test_projects/end_to_end/single_errors/src/as_you_type.erl
similarity index 100%
rename from test/test_projects/end_to_end/single_errors/src/as_you_type.erl
rename to test_projects/end_to_end/single_errors/src/as_you_type.erl
diff --git a/test/test_projects/end_to_end/single_errors/src/compiler_diagnostics.erl b/test_projects/end_to_end/single_errors/src/compiler_diagnostics.erl
similarity index 100%
rename from test/test_projects/end_to_end/single_errors/src/compiler_diagnostics.erl
rename to test_projects/end_to_end/single_errors/src/compiler_diagnostics.erl
diff --git a/test/test_projects/end_to_end/single_errors/src/single_errors.app.src b/test_projects/end_to_end/single_errors/src/single_errors.app.src
similarity index 100%
rename from test/test_projects/end_to_end/single_errors/src/single_errors.app.src
rename to test_projects/end_to_end/single_errors/src/single_errors.app.src
diff --git a/test/test_projects/end_to_end/single_errors/src/spec_mismatch.erl b/test_projects/end_to_end/single_errors/src/spec_mismatch.erl
similarity index 100%
rename from test/test_projects/end_to_end/single_errors/src/spec_mismatch.erl
rename to test_projects/end_to_end/single_errors/src/spec_mismatch.erl
diff --git a/test/test_projects/end_to_end/single_errors/src/spec_mismatch.erl.2 b/test_projects/end_to_end/single_errors/src/spec_mismatch.erl.2
similarity index 100%
rename from test/test_projects/end_to_end/single_errors/src/spec_mismatch.erl.2
rename to test_projects/end_to_end/single_errors/src/spec_mismatch.erl.2
diff --git a/test/test_projects/end_to_end/single_errors/src/types_on_hover.erl b/test_projects/end_to_end/single_errors/src/types_on_hover.erl
similarity index 100%
rename from test/test_projects/end_to_end/single_errors/src/types_on_hover.erl
rename to test_projects/end_to_end/single_errors/src/types_on_hover.erl
diff --git a/test/test_projects/end_to_end/single_errors/src/unused_macro.erl b/test_projects/end_to_end/single_errors/src/unused_macro.erl
similarity index 100%
rename from test/test_projects/end_to_end/single_errors/src/unused_macro.erl
rename to test_projects/end_to_end/single_errors/src/unused_macro.erl
diff --git a/test/test_projects/eqwalizer/src/eqwalizer.app.src b/test_projects/eqwalizer/src/eqwalizer.app.src
similarity index 100%
rename from test/test_projects/eqwalizer/src/eqwalizer.app.src
rename to test_projects/eqwalizer/src/eqwalizer.app.src
diff --git a/test/test_projects/eqwalizer/src/eqwalizer_specs.erl b/test_projects/eqwalizer/src/eqwalizer_specs.erl
similarity index 100%
rename from test/test_projects/eqwalizer/src/eqwalizer_specs.erl
rename to test_projects/eqwalizer/src/eqwalizer_specs.erl
diff --git a/test_projects/eqwalizer_callers/.elp.toml b/test_projects/eqwalizer_callers/.elp.toml
new file mode 100644
index 0000000000..f4b7f6f6ac
--- /dev/null
+++ b/test_projects/eqwalizer_callers/.elp.toml
@@ -0,0 +1,5 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "fbcode//whatsapp/elp/test_projects/eqwalizer_callers/..." ]
+source_root = "whatsapp/elp/test_projects/eqwalizer_callers"
diff --git a/test/test_projects/eqwalizer_callers/.gitignore b/test_projects/eqwalizer_callers/.gitignore
similarity index 100%
rename from test/test_projects/eqwalizer_callers/.gitignore
rename to test_projects/eqwalizer_callers/.gitignore
diff --git a/test/test_projects/eqwalizer_callers/app_a/include/app_a.hrl b/test_projects/eqwalizer_callers/app_a/include/app_a.hrl
similarity index 100%
rename from test/test_projects/eqwalizer_callers/app_a/include/app_a.hrl
rename to test_projects/eqwalizer_callers/app_a/include/app_a.hrl
diff --git a/test/test_projects/eqwalizer_callers/app_a/src/app_a.app.src b/test_projects/eqwalizer_callers/app_a/src/app_a.app.src
similarity index 100%
rename from test/test_projects/eqwalizer_callers/app_a/src/app_a.app.src
rename to test_projects/eqwalizer_callers/app_a/src/app_a.app.src
diff --git a/test/test_projects/eqwalizer_callers/app_a/src/app_a.erl b/test_projects/eqwalizer_callers/app_a/src/app_a.erl
similarity index 100%
rename from test/test_projects/eqwalizer_callers/app_a/src/app_a.erl
rename to test_projects/eqwalizer_callers/app_a/src/app_a.erl
diff --git a/test/test_projects/eqwalizer_callers/app_a/src/app_b.erl b/test_projects/eqwalizer_callers/app_a/src/app_b.erl
similarity index 100%
rename from test/test_projects/eqwalizer_callers/app_a/src/app_b.erl
rename to test_projects/eqwalizer_callers/app_a/src/app_b.erl
diff --git a/test/test_projects/eqwalizer_callers/app_a/test/app_a_SUITE.erl b/test_projects/eqwalizer_callers/app_a/test/app_a_SUITE.erl
similarity index 100%
rename from test/test_projects/eqwalizer_callers/app_a/test/app_a_SUITE.erl
rename to test_projects/eqwalizer_callers/app_a/test/app_a_SUITE.erl
diff --git a/test/test_projects/eqwalizer_callers/rebar.config b/test_projects/eqwalizer_callers/rebar.config
similarity index 100%
rename from test/test_projects/eqwalizer_callers/rebar.config
rename to test_projects/eqwalizer_callers/rebar.config
diff --git a/test/test_projects/eqwalizer_ignore_modules/.elp.toml b/test_projects/eqwalizer_ignore_modules/.elp.toml
similarity index 100%
rename from test/test_projects/eqwalizer_ignore_modules/.elp.toml
rename to test_projects/eqwalizer_ignore_modules/.elp.toml
diff --git a/test/test_projects/eqwalizer_ignore_modules/apps/app_a/include/app_a.hrl b/test_projects/eqwalizer_ignore_modules/apps/app_a/include/app_a.hrl
similarity index 100%
rename from test/test_projects/eqwalizer_ignore_modules/apps/app_a/include/app_a.hrl
rename to test_projects/eqwalizer_ignore_modules/apps/app_a/include/app_a.hrl
diff --git a/test/test_projects/eqwalizer_ignore_modules/apps/app_a/src/another_module_a.erl b/test_projects/eqwalizer_ignore_modules/apps/app_a/src/another_module_a.erl
similarity index 100%
rename from test/test_projects/eqwalizer_ignore_modules/apps/app_a/src/another_module_a.erl
rename to test_projects/eqwalizer_ignore_modules/apps/app_a/src/another_module_a.erl
diff --git a/test/test_projects/eqwalizer_ignore_modules/apps/app_a/src/app_a.erl b/test_projects/eqwalizer_ignore_modules/apps/app_a/src/app_a.erl
similarity index 100%
rename from test/test_projects/eqwalizer_ignore_modules/apps/app_a/src/app_a.erl
rename to test_projects/eqwalizer_ignore_modules/apps/app_a/src/app_a.erl
diff --git a/test/test_projects/eqwalizer_ignore_modules/apps/app_b/src/app_b.erl b/test_projects/eqwalizer_ignore_modules/apps/app_b/src/app_b.erl
similarity index 100%
rename from test/test_projects/eqwalizer_ignore_modules/apps/app_b/src/app_b.erl
rename to test_projects/eqwalizer_ignore_modules/apps/app_b/src/app_b.erl
diff --git a/test_projects/eqwalizer_tests/.elp.toml b/test_projects/eqwalizer_tests/.elp.toml
new file mode 100644
index 0000000000..ed5c60502f
--- /dev/null
+++ b/test_projects/eqwalizer_tests/.elp.toml
@@ -0,0 +1,8 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "fbcode//whatsapp/elp/test_projects/eqwalizer_tests/..." ]
+source_root = "whatsapp/elp/test_projects/eqwalizer_tests"
+
+[eqwalizer]
+enable_all = true
diff --git a/test/test_projects/eqwalizer_tests/.gitignore b/test_projects/eqwalizer_tests/.gitignore
similarity index 100%
rename from test/test_projects/eqwalizer_tests/.gitignore
rename to test_projects/eqwalizer_tests/.gitignore
diff --git a/test/test_projects/eqwalizer_tests/.rebar.root b/test_projects/eqwalizer_tests/.rebar.root
similarity index 100%
rename from test/test_projects/eqwalizer_tests/.rebar.root
rename to test_projects/eqwalizer_tests/.rebar.root
diff --git a/test/test_projects/eqwalizer_tests/check/include/my_header.hrl b/test_projects/eqwalizer_tests/check/include/my_header.hrl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/include/my_header.hrl
rename to test_projects/eqwalizer_tests/check/include/my_header.hrl
diff --git a/test/test_projects/eqwalizer_tests/check/src/any_fun_type.erl b/test_projects/eqwalizer_tests/check/src/any_fun_type.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/any_fun_type.erl
rename to test_projects/eqwalizer_tests/check/src/any_fun_type.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/apply_none.erl b/test_projects/eqwalizer_tests/check/src/apply_none.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/apply_none.erl
rename to test_projects/eqwalizer_tests/check/src/apply_none.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/approx.erl b/test_projects/eqwalizer_tests/check/src/approx.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/approx.erl
rename to test_projects/eqwalizer_tests/check/src/approx.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/as_pat.erl b/test_projects/eqwalizer_tests/check/src/as_pat.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/as_pat.erl
rename to test_projects/eqwalizer_tests/check/src/as_pat.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/auto_imports.erl b/test_projects/eqwalizer_tests/check/src/auto_imports.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/auto_imports.erl
rename to test_projects/eqwalizer_tests/check/src/auto_imports.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/behave.erl b/test_projects/eqwalizer_tests/check/src/behave.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/behave.erl
rename to test_projects/eqwalizer_tests/check/src/behave.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/binaries.erl b/test_projects/eqwalizer_tests/check/src/binaries.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/binaries.erl
rename to test_projects/eqwalizer_tests/check/src/binaries.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/booleans.erl b/test_projects/eqwalizer_tests/check/src/booleans.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/booleans.erl
rename to test_projects/eqwalizer_tests/check/src/booleans.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/callbacks1_pos.erl b/test_projects/eqwalizer_tests/check/src/callbacks1_pos.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/callbacks1_pos.erl
rename to test_projects/eqwalizer_tests/check/src/callbacks1_pos.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/callbacks3_neg.erl b/test_projects/eqwalizer_tests/check/src/callbacks3_neg.erl
similarity index 70%
rename from test/test_projects/eqwalizer_tests/check/src/callbacks3_neg.erl
rename to test_projects/eqwalizer_tests/check/src/callbacks3_neg.erl
index 854feec923..8152487669 100644
--- a/test/test_projects/eqwalizer_tests/check/src/callbacks3_neg.erl
+++ b/test_projects/eqwalizer_tests/check/src/callbacks3_neg.erl
@@ -3,12 +3,11 @@
 %%% This source code is licensed under the Apache 2.0 license found in
 %%% the LICENSE file in the root directory of this source tree.
 
--module(callbacks3_neg). % @OTP27Only
+-module(callbacks3_neg). % @OTPVersionDependent
 -export([
     init/1,
     handle_call/3,
-    handle_cast/2,
-    handle_info/2
+    handle_cast/2
 ]).
 -behavior(gen_server).
 
@@ -20,7 +19,3 @@ handle_call(_, _From, State) ->
 -spec handle_cast(ok, ok) -> wrong_ret.
 handle_cast(_, _) ->
     wrong_ret.
-
--spec handle_info(ok, ok) -> {noreply, ok, wrong_atom}.
-handle_info(_, _) ->
-    {noreply, ok, wrong_atom}.
diff --git a/test/test_projects/eqwalizer_tests/check/src/callbacks4_neg.erl b/test_projects/eqwalizer_tests/check/src/callbacks4_neg.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/callbacks4_neg.erl
rename to test_projects/eqwalizer_tests/check/src/callbacks4_neg.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/callbacks5_neg.erl b/test_projects/eqwalizer_tests/check/src/callbacks5_neg.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/callbacks5_neg.erl
rename to test_projects/eqwalizer_tests/check/src/callbacks5_neg.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/callbacks6_neg.erl b/test_projects/eqwalizer_tests/check/src/callbacks6_neg.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/callbacks6_neg.erl
rename to test_projects/eqwalizer_tests/check/src/callbacks6_neg.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/callbacks7_overload_pos.erl b/test_projects/eqwalizer_tests/check/src/callbacks7_overload_pos.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/callbacks7_overload_pos.erl
rename to test_projects/eqwalizer_tests/check/src/callbacks7_overload_pos.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/case_predicates.erl b/test_projects/eqwalizer_tests/check/src/case_predicates.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/case_predicates.erl
rename to test_projects/eqwalizer_tests/check/src/case_predicates.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/check.app.src b/test_projects/eqwalizer_tests/check/src/check.app.src
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/check.app.src
rename to test_projects/eqwalizer_tests/check/src/check.app.src
diff --git a/test/test_projects/eqwalizer_tests/check/src/compiler_macro.erl b/test_projects/eqwalizer_tests/check/src/compiler_macro.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/compiler_macro.erl
rename to test_projects/eqwalizer_tests/check/src/compiler_macro.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/complex_maps.erl b/test_projects/eqwalizer_tests/check/src/complex_maps.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/complex_maps.erl
rename to test_projects/eqwalizer_tests/check/src/complex_maps.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/comprehensions.erl b/test_projects/eqwalizer_tests/check/src/comprehensions.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/comprehensions.erl
rename to test_projects/eqwalizer_tests/check/src/comprehensions.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/contravariant.erl b/test_projects/eqwalizer_tests/check/src/contravariant.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/contravariant.erl
rename to test_projects/eqwalizer_tests/check/src/contravariant.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/custom.erl b/test_projects/eqwalizer_tests/check/src/custom.erl
similarity index 99%
rename from test/test_projects/eqwalizer_tests/check/src/custom.erl
rename to test_projects/eqwalizer_tests/check/src/custom.erl
index b6910b0fc7..911bfa3a0a 100644
--- a/test/test_projects/eqwalizer_tests/check/src/custom.erl
+++ b/test_projects/eqwalizer_tests/check/src/custom.erl
@@ -3,7 +3,7 @@
 %%% This source code is licensed under the Apache 2.0 license found in
 %%% the LICENSE file in the root directory of this source tree.
 
--module(custom). % @OTP27Only
+-module(custom). % @OTPVersionDependent
 
 -import(maps, [get/2, get/3]).
 -compile([export_all, nowarn_export_all]).
diff --git a/test/test_projects/eqwalizer_tests/check/src/detached_specs1.erl b/test_projects/eqwalizer_tests/check/src/detached_specs1.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/detached_specs1.erl
rename to test_projects/eqwalizer_tests/check/src/detached_specs1.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/detached_specs2.erl b/test_projects/eqwalizer_tests/check/src/detached_specs2.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/detached_specs2.erl
rename to test_projects/eqwalizer_tests/check/src/detached_specs2.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/dyn_calls.erl b/test_projects/eqwalizer_tests/check/src/dyn_calls.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/dyn_calls.erl
rename to test_projects/eqwalizer_tests/check/src/dyn_calls.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/dyn_remote_funs.erl b/test_projects/eqwalizer_tests/check/src/dyn_remote_funs.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/dyn_remote_funs.erl
rename to test_projects/eqwalizer_tests/check/src/dyn_remote_funs.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/dynamic_callbacks_1.erl b/test_projects/eqwalizer_tests/check/src/dynamic_callbacks_1.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/dynamic_callbacks_1.erl
rename to test_projects/eqwalizer_tests/check/src/dynamic_callbacks_1.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/dynamic_callbacks_2.erl b/test_projects/eqwalizer_tests/check/src/dynamic_callbacks_2.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/dynamic_callbacks_2.erl
rename to test_projects/eqwalizer_tests/check/src/dynamic_callbacks_2.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/dynamic_calls.erl b/test_projects/eqwalizer_tests/check/src/dynamic_calls.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/dynamic_calls.erl
rename to test_projects/eqwalizer_tests/check/src/dynamic_calls.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/dynamic_catch.erl b/test_projects/eqwalizer_tests/check/src/dynamic_catch.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/dynamic_catch.erl
rename to test_projects/eqwalizer_tests/check/src/dynamic_catch.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/dynamic_fun.erl b/test_projects/eqwalizer_tests/check/src/dynamic_fun.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/dynamic_fun.erl
rename to test_projects/eqwalizer_tests/check/src/dynamic_fun.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/dynamic_generics.erl b/test_projects/eqwalizer_tests/check/src/dynamic_generics.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/dynamic_generics.erl
rename to test_projects/eqwalizer_tests/check/src/dynamic_generics.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/dynamic_local_funs.erl b/test_projects/eqwalizer_tests/check/src/dynamic_local_funs.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/dynamic_local_funs.erl
rename to test_projects/eqwalizer_tests/check/src/dynamic_local_funs.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/dynamic_receive.erl b/test_projects/eqwalizer_tests/check/src/dynamic_receive.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/dynamic_receive.erl
rename to test_projects/eqwalizer_tests/check/src/dynamic_receive.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/dynamic_refine.erl b/test_projects/eqwalizer_tests/check/src/dynamic_refine.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/dynamic_refine.erl
rename to test_projects/eqwalizer_tests/check/src/dynamic_refine.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/dynamic_try_catch.erl b/test_projects/eqwalizer_tests/check/src/dynamic_try_catch.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/dynamic_try_catch.erl
rename to test_projects/eqwalizer_tests/check/src/dynamic_try_catch.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/elab_clause.erl b/test_projects/eqwalizer_tests/check/src/elab_clause.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/elab_clause.erl
rename to test_projects/eqwalizer_tests/check/src/elab_clause.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/error_messages.erl b/test_projects/eqwalizer_tests/check/src/error_messages.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/error_messages.erl
rename to test_projects/eqwalizer_tests/check/src/error_messages.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/fancy_generics.erl b/test_projects/eqwalizer_tests/check/src/fancy_generics.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/fancy_generics.erl
rename to test_projects/eqwalizer_tests/check/src/fancy_generics.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/format.erl b/test_projects/eqwalizer_tests/check/src/format.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/format.erl
rename to test_projects/eqwalizer_tests/check/src/format.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/fun_stats.erl b/test_projects/eqwalizer_tests/check/src/fun_stats.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/fun_stats.erl
rename to test_projects/eqwalizer_tests/check/src/fun_stats.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/fun_stats2.erl b/test_projects/eqwalizer_tests/check/src/fun_stats2.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/fun_stats2.erl
rename to test_projects/eqwalizer_tests/check/src/fun_stats2.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/funs.erl b/test_projects/eqwalizer_tests/check/src/funs.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/funs.erl
rename to test_projects/eqwalizer_tests/check/src/funs.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/funs2.erl b/test_projects/eqwalizer_tests/check/src/funs2.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/funs2.erl
rename to test_projects/eqwalizer_tests/check/src/funs2.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/funs_uncommon.erl b/test_projects/eqwalizer_tests/check/src/funs_uncommon.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/funs_uncommon.erl
rename to test_projects/eqwalizer_tests/check/src/funs_uncommon.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/generic_fun_application.erl b/test_projects/eqwalizer_tests/check/src/generic_fun_application.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/generic_fun_application.erl
rename to test_projects/eqwalizer_tests/check/src/generic_fun_application.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/generics_with_unions.erl b/test_projects/eqwalizer_tests/check/src/generics_with_unions.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/generics_with_unions.erl
rename to test_projects/eqwalizer_tests/check/src/generics_with_unions.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/gradual_bounded.erl b/test_projects/eqwalizer_tests/check/src/gradual_bounded.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/gradual_bounded.erl
rename to test_projects/eqwalizer_tests/check/src/gradual_bounded.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/gradual_complex_types.erl b/test_projects/eqwalizer_tests/check/src/gradual_complex_types.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/gradual_complex_types.erl
rename to test_projects/eqwalizer_tests/check/src/gradual_complex_types.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/gradual_custom.erl b/test_projects/eqwalizer_tests/check/src/gradual_custom.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/gradual_custom.erl
rename to test_projects/eqwalizer_tests/check/src/gradual_custom.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/gradual_lambdas.erl b/test_projects/eqwalizer_tests/check/src/gradual_lambdas.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/gradual_lambdas.erl
rename to test_projects/eqwalizer_tests/check/src/gradual_lambdas.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/gradual_maybe.erl b/test_projects/eqwalizer_tests/check/src/gradual_maybe.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/gradual_maybe.erl
rename to test_projects/eqwalizer_tests/check/src/gradual_maybe.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/gradual_misc.erl b/test_projects/eqwalizer_tests/check/src/gradual_misc.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/gradual_misc.erl
rename to test_projects/eqwalizer_tests/check/src/gradual_misc.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/gradual_overloaded.erl b/test_projects/eqwalizer_tests/check/src/gradual_overloaded.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/gradual_overloaded.erl
rename to test_projects/eqwalizer_tests/check/src/gradual_overloaded.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/gradual_regression_01.erl b/test_projects/eqwalizer_tests/check/src/gradual_regression_01.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/gradual_regression_01.erl
rename to test_projects/eqwalizer_tests/check/src/gradual_regression_01.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/gradual_untyped.erl b/test_projects/eqwalizer_tests/check/src/gradual_untyped.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/gradual_untyped.erl
rename to test_projects/eqwalizer_tests/check/src/gradual_untyped.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/guard_b_connections.erl b/test_projects/eqwalizer_tests/check/src/guard_b_connections.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/guard_b_connections.erl
rename to test_projects/eqwalizer_tests/check/src/guard_b_connections.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/guards.erl b/test_projects/eqwalizer_tests/check/src/guards.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/guards.erl
rename to test_projects/eqwalizer_tests/check/src/guards.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/guards_logic.erl b/test_projects/eqwalizer_tests/check/src/guards_logic.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/guards_logic.erl
rename to test_projects/eqwalizer_tests/check/src/guards_logic.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/guards_simple.erl b/test_projects/eqwalizer_tests/check/src/guards_simple.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/guards_simple.erl
rename to test_projects/eqwalizer_tests/check/src/guards_simple.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/hints.erl b/test_projects/eqwalizer_tests/check/src/hints.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/hints.erl
rename to test_projects/eqwalizer_tests/check/src/hints.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/index1.erl b/test_projects/eqwalizer_tests/check/src/index1.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/index1.erl
rename to test_projects/eqwalizer_tests/check/src/index1.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/index2.erl b/test_projects/eqwalizer_tests/check/src/index2.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/index2.erl
rename to test_projects/eqwalizer_tests/check/src/index2.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/iolists.erl b/test_projects/eqwalizer_tests/check/src/iolists.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/iolists.erl
rename to test_projects/eqwalizer_tests/check/src/iolists.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/kp_01.erl b/test_projects/eqwalizer_tests/check/src/kp_01.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/kp_01.erl
rename to test_projects/eqwalizer_tests/check/src/kp_01.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/kp_02.erl b/test_projects/eqwalizer_tests/check/src/kp_02.erl
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rename from test/test_projects/eqwalizer_tests/check/src/kp_02.erl
rename to test_projects/eqwalizer_tests/check/src/kp_02.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/lists_tests.erl b/test_projects/eqwalizer_tests/check/src/lists_tests.erl
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rename from test/test_projects/eqwalizer_tests/check/src/lists_tests.erl
rename to test_projects/eqwalizer_tests/check/src/lists_tests.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/misc.erl b/test_projects/eqwalizer_tests/check/src/misc.erl
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rename to test_projects/eqwalizer_tests/check/src/misc.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/misc_lib.erl b/test_projects/eqwalizer_tests/check/src/misc_lib.erl
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rename from test/test_projects/eqwalizer_tests/check/src/misc_lib.erl
rename to test_projects/eqwalizer_tests/check/src/misc_lib.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/my_behaviour.erl b/test_projects/eqwalizer_tests/check/src/my_behaviour.erl
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rename from test/test_projects/eqwalizer_tests/check/src/my_behaviour.erl
rename to test_projects/eqwalizer_tests/check/src/my_behaviour.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/my_gradual_behaviour.erl b/test_projects/eqwalizer_tests/check/src/my_gradual_behaviour.erl
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rename from test/test_projects/eqwalizer_tests/check/src/my_gradual_behaviour.erl
rename to test_projects/eqwalizer_tests/check/src/my_gradual_behaviour.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/my_header.erl b/test_projects/eqwalizer_tests/check/src/my_header.erl
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rename from test/test_projects/eqwalizer_tests/check/src/my_header.erl
rename to test_projects/eqwalizer_tests/check/src/my_header.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/neg.erl b/test_projects/eqwalizer_tests/check/src/neg.erl
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rename from test/test_projects/eqwalizer_tests/check/src/neg.erl
rename to test_projects/eqwalizer_tests/check/src/neg.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/nested1/misc_nested1.erl b/test_projects/eqwalizer_tests/check/src/nested1/misc_nested1.erl
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rename from test/test_projects/eqwalizer_tests/check/src/nested1/misc_nested1.erl
rename to test_projects/eqwalizer_tests/check/src/nested1/misc_nested1.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/nested1/nested2/misc_nested2.erl b/test_projects/eqwalizer_tests/check/src/nested1/nested2/misc_nested2.erl
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diff --git a/test/test_projects/eqwalizer_tests/check/src/nowarn.erl b/test_projects/eqwalizer_tests/check/src/nowarn.erl
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rename from test/test_projects/eqwalizer_tests/check/src/nowarn.erl
rename to test_projects/eqwalizer_tests/check/src/nowarn.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/number_comparisons.erl b/test_projects/eqwalizer_tests/check/src/number_comparisons.erl
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rename to test_projects/eqwalizer_tests/check/src/number_comparisons.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/numbers.erl b/test_projects/eqwalizer_tests/check/src/numbers.erl
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rename from test/test_projects/eqwalizer_tests/check/src/numbers.erl
rename to test_projects/eqwalizer_tests/check/src/numbers.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/opaque.erl b/test_projects/eqwalizer_tests/check/src/opaque.erl
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rename from test/test_projects/eqwalizer_tests/check/src/opaque.erl
rename to test_projects/eqwalizer_tests/check/src/opaque.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/other.erl b/test_projects/eqwalizer_tests/check/src/other.erl
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rename from test/test_projects/eqwalizer_tests/check/src/other.erl
rename to test_projects/eqwalizer_tests/check/src/other.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/otp28.erl b/test_projects/eqwalizer_tests/check/src/otp28.erl
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rename from test/test_projects/eqwalizer_tests/check/src/otp28.erl
rename to test_projects/eqwalizer_tests/check/src/otp28.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/otp_opaques.erl b/test_projects/eqwalizer_tests/check/src/otp_opaques.erl
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rename from test/test_projects/eqwalizer_tests/check/src/otp_opaques.erl
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diff --git a/test/test_projects/eqwalizer_tests/check/src/overloaded.erl b/test_projects/eqwalizer_tests/check/src/overloaded.erl
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rename to test_projects/eqwalizer_tests/check/src/overloaded.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/overloaded_specs_union.erl b/test_projects/eqwalizer_tests/check/src/overloaded_specs_union.erl
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rename from test/test_projects/eqwalizer_tests/check/src/overloaded_specs_union.erl
rename to test_projects/eqwalizer_tests/check/src/overloaded_specs_union.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/parametricity.erl b/test_projects/eqwalizer_tests/check/src/parametricity.erl
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rename from test/test_projects/eqwalizer_tests/check/src/parametricity.erl
rename to test_projects/eqwalizer_tests/check/src/parametricity.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/pats.erl b/test_projects/eqwalizer_tests/check/src/pats.erl
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rename to test_projects/eqwalizer_tests/check/src/pats.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/pinned.erl b/test_projects/eqwalizer_tests/check/src/pinned.erl
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diff --git a/test/test_projects/eqwalizer_tests/check/src/pos.erl b/test_projects/eqwalizer_tests/check/src/pos.erl
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diff --git a/test/test_projects/eqwalizer_tests/check/src/records.erl b/test_projects/eqwalizer_tests/check/src/records.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/records.erl
rename to test_projects/eqwalizer_tests/check/src/records.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/recursive_aliases.erl b/test_projects/eqwalizer_tests/check/src/recursive_aliases.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/recursive_aliases.erl
rename to test_projects/eqwalizer_tests/check/src/recursive_aliases.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/refine.erl b/test_projects/eqwalizer_tests/check/src/refine.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/refine.erl
rename to test_projects/eqwalizer_tests/check/src/refine.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/scoping.erl b/test_projects/eqwalizer_tests/check/src/scoping.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/scoping.erl
rename to test_projects/eqwalizer_tests/check/src/scoping.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/skip.erl b/test_projects/eqwalizer_tests/check/src/skip.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/skip.erl
rename to test_projects/eqwalizer_tests/check/src/skip.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/static_maybe.erl b/test_projects/eqwalizer_tests/check/src/static_maybe.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/static_maybe.erl
rename to test_projects/eqwalizer_tests/check/src/static_maybe.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/strict_complex_types.erl b/test_projects/eqwalizer_tests/check/src/strict_complex_types.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/strict_complex_types.erl
rename to test_projects/eqwalizer_tests/check/src/strict_complex_types.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/strict_fun.erl b/test_projects/eqwalizer_tests/check/src/strict_fun.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/strict_fun.erl
rename to test_projects/eqwalizer_tests/check/src/strict_fun.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/strict_receive.erl b/test_projects/eqwalizer_tests/check/src/strict_receive.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/strict_receive.erl
rename to test_projects/eqwalizer_tests/check/src/strict_receive.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/subtype_neg.erl b/test_projects/eqwalizer_tests/check/src/subtype_neg.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/subtype_neg.erl
rename to test_projects/eqwalizer_tests/check/src/subtype_neg.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/subtype_pos.erl b/test_projects/eqwalizer_tests/check/src/subtype_pos.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/subtype_pos.erl
rename to test_projects/eqwalizer_tests/check/src/subtype_pos.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/t_maps.erl b/test_projects/eqwalizer_tests/check/src/t_maps.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/t_maps.erl
rename to test_projects/eqwalizer_tests/check/src/t_maps.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/tagged_tuples.erl b/test_projects/eqwalizer_tests/check/src/tagged_tuples.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/tagged_tuples.erl
rename to test_projects/eqwalizer_tests/check/src/tagged_tuples.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/test.erl b/test_projects/eqwalizer_tests/check/src/test.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/test.erl
rename to test_projects/eqwalizer_tests/check/src/test.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/tries.erl b/test_projects/eqwalizer_tests/check/src/tries.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/tries.erl
rename to test_projects/eqwalizer_tests/check/src/tries.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/tuple_union.erl b/test_projects/eqwalizer_tests/check/src/tuple_union.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/tuple_union.erl
rename to test_projects/eqwalizer_tests/check/src/tuple_union.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/type_aliases.erl b/test_projects/eqwalizer_tests/check/src/type_aliases.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/type_aliases.erl
rename to test_projects/eqwalizer_tests/check/src/type_aliases.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/type_asserts.erl b/test_projects/eqwalizer_tests/check/src/type_asserts.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/type_asserts.erl
rename to test_projects/eqwalizer_tests/check/src/type_asserts.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/type_predicates.erl b/test_projects/eqwalizer_tests/check/src/type_predicates.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/type_predicates.erl
rename to test_projects/eqwalizer_tests/check/src/type_predicates.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/united_fun.erl b/test_projects/eqwalizer_tests/check/src/united_fun.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/united_fun.erl
rename to test_projects/eqwalizer_tests/check/src/united_fun.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/unspecced.erl b/test_projects/eqwalizer_tests/check/src/unspecced.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/unspecced.erl
rename to test_projects/eqwalizer_tests/check/src/unspecced.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/use_dynamic_gradual.erl b/test_projects/eqwalizer_tests/check/src/use_dynamic_gradual.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/use_dynamic_gradual.erl
rename to test_projects/eqwalizer_tests/check/src/use_dynamic_gradual.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/use_dynamic_strict.erl b/test_projects/eqwalizer_tests/check/src/use_dynamic_strict.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/use_dynamic_strict.erl
rename to test_projects/eqwalizer_tests/check/src/use_dynamic_strict.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/vars1.erl b/test_projects/eqwalizer_tests/check/src/vars1.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/vars1.erl
rename to test_projects/eqwalizer_tests/check/src/vars1.erl
diff --git a/test/test_projects/eqwalizer_tests/check/src/vars2.erl b/test_projects/eqwalizer_tests/check/src/vars2.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/src/vars2.erl
rename to test_projects/eqwalizer_tests/check/src/vars2.erl
diff --git a/test/test_projects/eqwalizer_tests/check/test/check_SUITE.erl b/test_projects/eqwalizer_tests/check/test/check_SUITE.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/check/test/check_SUITE.erl
rename to test_projects/eqwalizer_tests/check/test/check_SUITE.erl
diff --git a/test/test_projects/eqwalizer_tests/debug/include/debug_header.hrl b/test_projects/eqwalizer_tests/debug/include/debug_header.hrl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/debug/include/debug_header.hrl
rename to test_projects/eqwalizer_tests/debug/include/debug_header.hrl
diff --git a/test/test_projects/eqwalizer_tests/debug/src/attributes.erl b/test_projects/eqwalizer_tests/debug/src/attributes.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/debug/src/attributes.erl
rename to test_projects/eqwalizer_tests/debug/src/attributes.erl
diff --git a/test/test_projects/eqwalizer_tests/debug/src/debug.app.src b/test_projects/eqwalizer_tests/debug/src/debug.app.src
similarity index 100%
rename from test/test_projects/eqwalizer_tests/debug/src/debug.app.src
rename to test_projects/eqwalizer_tests/debug/src/debug.app.src
diff --git a/test/test_projects/eqwalizer_tests/debug/src/debug_header.erl b/test_projects/eqwalizer_tests/debug/src/debug_header.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/debug/src/debug_header.erl
rename to test_projects/eqwalizer_tests/debug/src/debug_header.erl
diff --git a/test/test_projects/eqwalizer_tests/debug/src/expand.erl b/test_projects/eqwalizer_tests/debug/src/expand.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/debug/src/expand.erl
rename to test_projects/eqwalizer_tests/debug/src/expand.erl
diff --git a/test/test_projects/eqwalizer_tests/debug/src/expr1.erl b/test_projects/eqwalizer_tests/debug/src/expr1.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/debug/src/expr1.erl
rename to test_projects/eqwalizer_tests/debug/src/expr1.erl
diff --git a/test/test_projects/eqwalizer_tests/debug/src/expr2.erl b/test_projects/eqwalizer_tests/debug/src/expr2.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/debug/src/expr2.erl
rename to test_projects/eqwalizer_tests/debug/src/expr2.erl
diff --git a/test/test_projects/eqwalizer_tests/debug/src/records_wip.erl b/test_projects/eqwalizer_tests/debug/src/records_wip.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/debug/src/records_wip.erl
rename to test_projects/eqwalizer_tests/debug/src/records_wip.erl
diff --git a/test/test_projects/eqwalizer_tests/debug/src/types1.erl b/test_projects/eqwalizer_tests/debug/src/types1.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/debug/src/types1.erl
rename to test_projects/eqwalizer_tests/debug/src/types1.erl
diff --git a/test/test_projects/eqwalizer_tests/debug/src/types2.erl b/test_projects/eqwalizer_tests/debug/src/types2.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/debug/src/types2.erl
rename to test_projects/eqwalizer_tests/debug/src/types2.erl
diff --git a/test/test_projects/eqwalizer_tests/debug/src/wip_maps.erl b/test_projects/eqwalizer_tests/debug/src/wip_maps.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/debug/src/wip_maps.erl
rename to test_projects/eqwalizer_tests/debug/src/wip_maps.erl
diff --git a/test/test_projects/eqwalizer_tests/elm_core/src/basics.erl b/test_projects/eqwalizer_tests/elm_core/src/basics.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/elm_core/src/basics.erl
rename to test_projects/eqwalizer_tests/elm_core/src/basics.erl
diff --git a/test/test_projects/eqwalizer_tests/elm_core/src/elm_core.app.src b/test_projects/eqwalizer_tests/elm_core/src/elm_core.app.src
similarity index 100%
rename from test/test_projects/eqwalizer_tests/elm_core/src/elm_core.app.src
rename to test_projects/eqwalizer_tests/elm_core/src/elm_core.app.src
diff --git a/test/test_projects/eqwalizer_tests/elm_core/src/list.erl b/test_projects/eqwalizer_tests/elm_core/src/list.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/elm_core/src/list.erl
rename to test_projects/eqwalizer_tests/elm_core/src/list.erl
diff --git a/test/test_projects/eqwalizer_tests/elm_core/src/map.erl b/test_projects/eqwalizer_tests/elm_core/src/map.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/elm_core/src/map.erl
rename to test_projects/eqwalizer_tests/elm_core/src/map.erl
diff --git a/test/test_projects/eqwalizer_tests/elm_core/src/map_ffi.erl b/test_projects/eqwalizer_tests/elm_core/src/map_ffi.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/elm_core/src/map_ffi.erl
rename to test_projects/eqwalizer_tests/elm_core/src/map_ffi.erl
diff --git a/test/test_projects/eqwalizer_tests/elm_core/src/maybe.erl b/test_projects/eqwalizer_tests/elm_core/src/maybe.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/elm_core/src/maybe.erl
rename to test_projects/eqwalizer_tests/elm_core/src/maybe.erl
diff --git a/test/test_projects/eqwalizer_tests/elm_core/src/result.erl b/test_projects/eqwalizer_tests/elm_core/src/result.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/elm_core/src/result.erl
rename to test_projects/eqwalizer_tests/elm_core/src/result.erl
diff --git a/test/test_projects/eqwalizer_tests/elm_core/src/tuple.erl b/test_projects/eqwalizer_tests/elm_core/src/tuple.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/elm_core/src/tuple.erl
rename to test_projects/eqwalizer_tests/elm_core/src/tuple.erl
diff --git a/test/test_projects/eqwalizer_tests/eqwalizer/include/eqwalizer.hrl b/test_projects/eqwalizer_tests/eqwalizer/include/eqwalizer.hrl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwalizer/include/eqwalizer.hrl
rename to test_projects/eqwalizer_tests/eqwalizer/include/eqwalizer.hrl
diff --git a/test/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer.app.src b/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer.app.src
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer.app.src
rename to test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer.app.src
diff --git a/test/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer.erl b/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer.erl
rename to test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer.erl
diff --git a/test/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer_specs.erl b/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer_specs.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer_specs.erl
rename to test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer_specs.erl
diff --git a/test/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_build_info_prv.erl b/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_build_info_prv.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_build_info_prv.erl
rename to test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_build_info_prv.erl
diff --git a/test/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_rebar3.app.src b/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_rebar3.app.src
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_rebar3.app.src
rename to test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_rebar3.app.src
diff --git a/test/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_rebar3.erl b/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_rebar3.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_rebar3.erl
rename to test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_rebar3.erl
diff --git a/test/test_projects/eqwalizer_tests/eqwater/readme.md b/test_projects/eqwalizer_tests/eqwater/readme.md
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwater/readme.md
rename to test_projects/eqwalizer_tests/eqwater/readme.md
diff --git a/test/test_projects/eqwalizer_tests/eqwater/src/deep_tuples.erl b/test_projects/eqwalizer_tests/eqwater/src/deep_tuples.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwater/src/deep_tuples.erl
rename to test_projects/eqwalizer_tests/eqwater/src/deep_tuples.erl
diff --git a/test/test_projects/eqwalizer_tests/eqwater/src/eqwater.app.src b/test_projects/eqwalizer_tests/eqwater/src/eqwater.app.src
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwater/src/eqwater.app.src
rename to test_projects/eqwalizer_tests/eqwater/src/eqwater.app.src
diff --git a/test/test_projects/eqwalizer_tests/eqwater/src/eqwater.erl b/test_projects/eqwalizer_tests/eqwater/src/eqwater.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwater/src/eqwater.erl
rename to test_projects/eqwalizer_tests/eqwater/src/eqwater.erl
diff --git a/test/test_projects/eqwalizer_tests/eqwater/src/eqwater_aliases.erl b/test_projects/eqwalizer_tests/eqwater/src/eqwater_aliases.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwater/src/eqwater_aliases.erl
rename to test_projects/eqwalizer_tests/eqwater/src/eqwater_aliases.erl
diff --git a/test/test_projects/eqwalizer_tests/eqwater/src/eqwater_generics.erl b/test_projects/eqwalizer_tests/eqwater/src/eqwater_generics.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwater/src/eqwater_generics.erl
rename to test_projects/eqwalizer_tests/eqwater/src/eqwater_generics.erl
diff --git a/test/test_projects/eqwalizer_tests/eqwater/src/eqwater_lists.erl b/test_projects/eqwalizer_tests/eqwater/src/eqwater_lists.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwater/src/eqwater_lists.erl
rename to test_projects/eqwalizer_tests/eqwater/src/eqwater_lists.erl
diff --git a/test/test_projects/eqwalizer_tests/eqwater/src/eqwater_maps.erl b/test_projects/eqwalizer_tests/eqwater/src/eqwater_maps.erl
similarity index 89%
rename from test/test_projects/eqwalizer_tests/eqwater/src/eqwater_maps.erl
rename to test_projects/eqwalizer_tests/eqwater/src/eqwater_maps.erl
index 68d938f790..78ae852b8a 100644
--- a/test/test_projects/eqwalizer_tests/eqwater/src/eqwater_maps.erl
+++ b/test_projects/eqwalizer_tests/eqwater/src/eqwater_maps.erl
@@ -59,13 +59,3 @@ map_occ_08_neg(_) -> err.
 map_occ_09(#{a := undefined}) -> 1;
 map_occ_09(#{a := Map}) -> Map#{2 => 2};
 map_occ_09(_) -> 3.
-
--spec is_ok(ok) -> ok.
-is_ok(ok) -> ok.
-
--spec map_occ_foreach_neg(#{term() => #{a => ok | err}}) -> ok.
-map_occ_foreach_neg(M) ->
-  maps:foreach(fun
-    (_, #{a := err}) -> ok;
-    (_, #{a := V}) -> is_ok(V)
-  end, M).
diff --git a/test/test_projects/eqwalizer_tests/eqwater/src/eqwater_records.erl b/test_projects/eqwalizer_tests/eqwater/src/eqwater_records.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwater/src/eqwater_records.erl
rename to test_projects/eqwalizer_tests/eqwater/src/eqwater_records.erl
diff --git a/test/test_projects/eqwalizer_tests/eqwater/src/eqwater_sound.erl b/test_projects/eqwalizer_tests/eqwater/src/eqwater_sound.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwater/src/eqwater_sound.erl
rename to test_projects/eqwalizer_tests/eqwater/src/eqwater_sound.erl
diff --git a/test/test_projects/eqwalizer_tests/eqwater/src/unlimited_refinement.erl b/test_projects/eqwalizer_tests/eqwater/src/unlimited_refinement.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/eqwater/src/unlimited_refinement.erl
rename to test_projects/eqwalizer_tests/eqwater/src/unlimited_refinement.erl
diff --git a/test/test_projects/eqwalizer_tests/fault_tolerance/.eqwalizer b/test_projects/eqwalizer_tests/fault_tolerance/.eqwalizer
similarity index 100%
rename from test/test_projects/eqwalizer_tests/fault_tolerance/.eqwalizer
rename to test_projects/eqwalizer_tests/fault_tolerance/.eqwalizer
diff --git a/test/test_projects/eqwalizer_tests/fault_tolerance/src/fault_tolerance.app.src b/test_projects/eqwalizer_tests/fault_tolerance/src/fault_tolerance.app.src
similarity index 100%
rename from test/test_projects/eqwalizer_tests/fault_tolerance/src/fault_tolerance.app.src
rename to test_projects/eqwalizer_tests/fault_tolerance/src/fault_tolerance.app.src
diff --git a/test/test_projects/eqwalizer_tests/fault_tolerance/src/fault_tolerance.erl b/test_projects/eqwalizer_tests/fault_tolerance/src/fault_tolerance.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/fault_tolerance/src/fault_tolerance.erl
rename to test_projects/eqwalizer_tests/fault_tolerance/src/fault_tolerance.erl
diff --git a/test/test_projects/eqwalizer_tests/options/src/bad_maps.erl b/test_projects/eqwalizer_tests/options/src/bad_maps.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/options/src/bad_maps.erl
rename to test_projects/eqwalizer_tests/options/src/bad_maps.erl
diff --git a/test/test_projects/eqwalizer_tests/options/src/dynamic_lambdas.erl b/test_projects/eqwalizer_tests/options/src/dynamic_lambdas.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/options/src/dynamic_lambdas.erl
rename to test_projects/eqwalizer_tests/options/src/dynamic_lambdas.erl
diff --git a/test/test_projects/eqwalizer_tests/options/src/options.app.src b/test_projects/eqwalizer_tests/options/src/options.app.src
similarity index 100%
rename from test/test_projects/eqwalizer_tests/options/src/options.app.src
rename to test_projects/eqwalizer_tests/options/src/options.app.src
diff --git a/test/test_projects/eqwalizer_tests/options/src/overloaded_specs_dynamic_result.erl b/test_projects/eqwalizer_tests/options/src/overloaded_specs_dynamic_result.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/options/src/overloaded_specs_dynamic_result.erl
rename to test_projects/eqwalizer_tests/options/src/overloaded_specs_dynamic_result.erl
diff --git a/test/test_projects/eqwalizer_tests/options/src/redundant_guards.erl b/test_projects/eqwalizer_tests/options/src/redundant_guards.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/options/src/redundant_guards.erl
rename to test_projects/eqwalizer_tests/options/src/redundant_guards.erl
diff --git a/test/test_projects/eqwalizer_tests/options/src/uncovered_clauses.erl b/test_projects/eqwalizer_tests/options/src/uncovered_clauses.erl
similarity index 100%
rename from test/test_projects/eqwalizer_tests/options/src/uncovered_clauses.erl
rename to test_projects/eqwalizer_tests/options/src/uncovered_clauses.erl
diff --git a/test/test_projects/eqwalizer_tests/rebar.config b/test_projects/eqwalizer_tests/rebar.config
similarity index 100%
rename from test/test_projects/eqwalizer_tests/rebar.config
rename to test_projects/eqwalizer_tests/rebar.config
diff --git a/test_projects/hierarchical_config/.elp.toml b/test_projects/hierarchical_config/.elp.toml
new file mode 100644
index 0000000000..1033c181ee
--- /dev/null
+++ b/test_projects/hierarchical_config/.elp.toml
@@ -0,0 +1,5 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "fbcode//whatsapp/elp/test_projects/hierarchical_config/..." ]
+source_root = "whatsapp/elp/test_projects/hierarchical_config"
diff --git a/test/test_projects/hierarchical_config/.elp_lint.toml b/test_projects/hierarchical_config/.elp_lint.toml
similarity index 100%
rename from test/test_projects/hierarchical_config/.elp_lint.toml
rename to test_projects/hierarchical_config/.elp_lint.toml
diff --git a/test/test_projects/hierarchical_config/app_a/.elp_lint.toml b/test_projects/hierarchical_config/app_a/.elp_lint.toml
similarity index 100%
rename from test/test_projects/hierarchical_config/app_a/.elp_lint.toml
rename to test_projects/hierarchical_config/app_a/.elp_lint.toml
diff --git a/test/test_projects/hierarchical_config/app_a/src/app_a.app.src b/test_projects/hierarchical_config/app_a/src/app_a.app.src
similarity index 100%
rename from test/test_projects/hierarchical_config/app_a/src/app_a.app.src
rename to test_projects/hierarchical_config/app_a/src/app_a.app.src
diff --git a/test/test_projects/hierarchical_config/app_a/src/app_a.erl b/test_projects/hierarchical_config/app_a/src/app_a.erl
similarity index 100%
rename from test/test_projects/hierarchical_config/app_a/src/app_a.erl
rename to test_projects/hierarchical_config/app_a/src/app_a.erl
diff --git a/test/test_projects/hierarchical_config/app_b/src/app_b.app.src b/test_projects/hierarchical_config/app_b/src/app_b.app.src
similarity index 100%
rename from test/test_projects/hierarchical_config/app_b/src/app_b.app.src
rename to test_projects/hierarchical_config/app_b/src/app_b.app.src
diff --git a/test/test_projects/hierarchical_config/app_b/src/app_b.erl b/test_projects/hierarchical_config/app_b/src/app_b.erl
similarity index 100%
rename from test/test_projects/hierarchical_config/app_b/src/app_b.erl
rename to test_projects/hierarchical_config/app_b/src/app_b.erl
diff --git a/test/test_projects/hierarchical_config/rebar.config b/test_projects/hierarchical_config/rebar.config
similarity index 100%
rename from test/test_projects/hierarchical_config/rebar.config
rename to test_projects/hierarchical_config/rebar.config
diff --git a/test_projects/in_place_tests/.elp.toml b/test_projects/in_place_tests/.elp.toml
new file mode 100644
index 0000000000..b6c251f03c
--- /dev/null
+++ b/test_projects/in_place_tests/.elp.toml
@@ -0,0 +1,5 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "fbcode//whatsapp/elp/test_projects/in_place_tests/..." ]
+source_root = "whatsapp/elp/test_projects/in_place_tests"
diff --git a/test/test_projects/in_place_tests/README.md b/test_projects/in_place_tests/README.md
similarity index 100%
rename from test/test_projects/in_place_tests/README.md
rename to test_projects/in_place_tests/README.md
diff --git a/test/test_projects/in_place_tests/app_a/extra/app_a.erl b/test_projects/in_place_tests/app_a/extra/app_a.erl
similarity index 100%
rename from test/test_projects/in_place_tests/app_a/extra/app_a.erl
rename to test_projects/in_place_tests/app_a/extra/app_a.erl
diff --git a/test/test_projects/in_place_tests/app_a/include/app_a.hrl b/test_projects/in_place_tests/app_a/include/app_a.hrl
similarity index 100%
rename from test/test_projects/in_place_tests/app_a/include/app_a.hrl
rename to test_projects/in_place_tests/app_a/include/app_a.hrl
diff --git a/test/test_projects/in_place_tests/app_a/include/broken_diagnostics.hrl b/test_projects/in_place_tests/app_a/include/broken_diagnostics.hrl
similarity index 100%
rename from test/test_projects/in_place_tests/app_a/include/broken_diagnostics.hrl
rename to test_projects/in_place_tests/app_a/include/broken_diagnostics.hrl
diff --git a/test/test_projects/in_place_tests/app_a/include/diagnostics.hrl b/test_projects/in_place_tests/app_a/include/diagnostics.hrl
similarity index 100%
rename from test/test_projects/in_place_tests/app_a/include/diagnostics.hrl
rename to test_projects/in_place_tests/app_a/include/diagnostics.hrl
diff --git a/test/test_projects/in_place_tests/app_a/src/app_a.app.src b/test_projects/in_place_tests/app_a/src/app_a.app.src
similarity index 100%
rename from test/test_projects/in_place_tests/app_a/src/app_a.app.src
rename to test_projects/in_place_tests/app_a/src/app_a.app.src
diff --git a/test/test_projects/in_place_tests/app_a/src/app_a.erl b/test_projects/in_place_tests/app_a/src/app_a.erl
similarity index 100%
rename from test/test_projects/in_place_tests/app_a/src/app_a.erl
rename to test_projects/in_place_tests/app_a/src/app_a.erl
diff --git a/test/test_projects/in_place_tests/app_a/src/lints.erl b/test_projects/in_place_tests/app_a/src/lints.erl
similarity index 100%
rename from test/test_projects/in_place_tests/app_a/src/lints.erl
rename to test_projects/in_place_tests/app_a/src/lints.erl
diff --git a/test/test_projects/in_place_tests/app_a/test/app_a_SUITE.erl b/test_projects/in_place_tests/app_a/test/app_a_SUITE.erl
similarity index 100%
rename from test/test_projects/in_place_tests/app_a/test/app_a_SUITE.erl
rename to test_projects/in_place_tests/app_a/test/app_a_SUITE.erl
diff --git a/test/test_projects/in_place_tests/erlang_ls.config b/test_projects/in_place_tests/erlang_ls.config
similarity index 100%
rename from test/test_projects/in_place_tests/erlang_ls.config
rename to test_projects/in_place_tests/erlang_ls.config
diff --git a/test/test_projects/in_place_tests/rebar.config b/test_projects/in_place_tests/rebar.config
similarity index 100%
rename from test/test_projects/in_place_tests/rebar.config
rename to test_projects/in_place_tests/rebar.config
diff --git a/test_projects/include_lib_dependency_test/.elp.toml b/test_projects/include_lib_dependency_test/.elp.toml
new file mode 100644
index 0000000000..65e106a9e2
--- /dev/null
+++ b/test_projects/include_lib_dependency_test/.elp.toml
@@ -0,0 +1,5 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "fbcode//whatsapp/elp/test_projects/include_lib_dependency_test/..." ]
+source_root = "whatsapp/elp/test_projects/include_lib_dependency_test"
diff --git a/test/test_projects/include_lib_dependency_test/external_app/include/external_header.hrl b/test_projects/include_lib_dependency_test/external_app/include/external_header.hrl
similarity index 100%
rename from test/test_projects/include_lib_dependency_test/external_app/include/external_header.hrl
rename to test_projects/include_lib_dependency_test/external_app/include/external_header.hrl
diff --git a/test/test_projects/include_lib_dependency_test/external_app/src/external_app.app.src b/test_projects/include_lib_dependency_test/external_app/src/external_app.app.src
similarity index 100%
rename from test/test_projects/include_lib_dependency_test/external_app/src/external_app.app.src
rename to test_projects/include_lib_dependency_test/external_app/src/external_app.app.src
diff --git a/test/test_projects/include_lib_dependency_test/external_app/src/external_app.erl b/test_projects/include_lib_dependency_test/external_app/src/external_app.erl
similarity index 100%
rename from test/test_projects/include_lib_dependency_test/external_app/src/external_app.erl
rename to test_projects/include_lib_dependency_test/external_app/src/external_app.erl
diff --git a/test/test_projects/include_lib_dependency_test/extra_app/include/extra_header.hrl b/test_projects/include_lib_dependency_test/extra_app/include/extra_header.hrl
similarity index 100%
rename from test/test_projects/include_lib_dependency_test/extra_app/include/extra_header.hrl
rename to test_projects/include_lib_dependency_test/extra_app/include/extra_header.hrl
diff --git a/test/test_projects/include_lib_dependency_test/extra_app/src/extra_app.app.src b/test_projects/include_lib_dependency_test/extra_app/src/extra_app.app.src
similarity index 100%
rename from test/test_projects/include_lib_dependency_test/extra_app/src/extra_app.app.src
rename to test_projects/include_lib_dependency_test/extra_app/src/extra_app.app.src
diff --git a/test/test_projects/include_lib_dependency_test/extra_app/src/extra_app.erl b/test_projects/include_lib_dependency_test/extra_app/src/extra_app.erl
similarity index 100%
rename from test/test_projects/include_lib_dependency_test/extra_app/src/extra_app.erl
rename to test_projects/include_lib_dependency_test/extra_app/src/extra_app.erl
diff --git a/test/test_projects/include_lib_dependency_test/main_app/src/main_app.app.src b/test_projects/include_lib_dependency_test/main_app/src/main_app.app.src
similarity index 100%
rename from test/test_projects/include_lib_dependency_test/main_app/src/main_app.app.src
rename to test_projects/include_lib_dependency_test/main_app/src/main_app.app.src
diff --git a/test/test_projects/include_lib_dependency_test/main_app/src/main_app.erl b/test_projects/include_lib_dependency_test/main_app/src/main_app.erl
similarity index 100%
rename from test/test_projects/include_lib_dependency_test/main_app/src/main_app.erl
rename to test_projects/include_lib_dependency_test/main_app/src/main_app.erl
diff --git a/test/test_projects/include_lib_dependency_test/normal_dep/include/assert.hrl b/test_projects/include_lib_dependency_test/normal_dep/include/assert.hrl
similarity index 100%
rename from test/test_projects/include_lib_dependency_test/normal_dep/include/assert.hrl
rename to test_projects/include_lib_dependency_test/normal_dep/include/assert.hrl
diff --git a/test/test_projects/include_lib_dependency_test/normal_dep/src/normal_dep.app.src b/test_projects/include_lib_dependency_test/normal_dep/src/normal_dep.app.src
similarity index 100%
rename from test/test_projects/include_lib_dependency_test/normal_dep/src/normal_dep.app.src
rename to test_projects/include_lib_dependency_test/normal_dep/src/normal_dep.app.src
diff --git a/test/test_projects/include_lib_dependency_test/normal_dep/src/normal_dep.erl b/test_projects/include_lib_dependency_test/normal_dep/src/normal_dep.erl
similarity index 100%
rename from test/test_projects/include_lib_dependency_test/normal_dep/src/normal_dep.erl
rename to test_projects/include_lib_dependency_test/normal_dep/src/normal_dep.erl
diff --git a/test/test_projects/include_lib_dependency_test/rebar.config b/test_projects/include_lib_dependency_test/rebar.config
similarity index 100%
rename from test/test_projects/include_lib_dependency_test/rebar.config
rename to test_projects/include_lib_dependency_test/rebar.config
diff --git a/test_projects/linter/.elp.toml b/test_projects/linter/.elp.toml
new file mode 100644
index 0000000000..a887ab835c
--- /dev/null
+++ b/test_projects/linter/.elp.toml
@@ -0,0 +1,5 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "fbcode//whatsapp/elp/test_projects/linter/..." ]
+source_root = "whatsapp/elp/test_projects/linter"
diff --git a/test/test_projects/linter/.elp_lint.toml b/test_projects/linter/.elp_lint.toml
similarity index 100%
rename from test/test_projects/linter/.elp_lint.toml
rename to test_projects/linter/.elp_lint.toml
diff --git a/test/test_projects/linter/.gitignore b/test_projects/linter/.gitignore
similarity index 100%
rename from test/test_projects/linter/.gitignore
rename to test_projects/linter/.gitignore
diff --git a/test/test_projects/linter/app_a/include/app_a.hrl b/test_projects/linter/app_a/include/app_a.hrl
similarity index 100%
rename from test/test_projects/linter/app_a/include/app_a.hrl
rename to test_projects/linter/app_a/include/app_a.hrl
diff --git a/test/test_projects/linter/app_a/src/app_a.app.src b/test_projects/linter/app_a/src/app_a.app.src
similarity index 100%
rename from test/test_projects/linter/app_a/src/app_a.app.src
rename to test_projects/linter/app_a/src/app_a.app.src
diff --git a/test/test_projects/linter/app_a/src/app_a.erl b/test_projects/linter/app_a/src/app_a.erl
similarity index 100%
rename from test/test_projects/linter/app_a/src/app_a.erl
rename to test_projects/linter/app_a/src/app_a.erl
diff --git a/test/test_projects/linter/app_a/src/app_a_edoc.erl b/test_projects/linter/app_a/src/app_a_edoc.erl
similarity index 100%
rename from test/test_projects/linter/app_a/src/app_a_edoc.erl
rename to test_projects/linter/app_a/src/app_a_edoc.erl
diff --git a/test/test_projects/linter/app_a/src/app_a_ssr.erl b/test_projects/linter/app_a/src/app_a_ssr.erl
similarity index 100%
rename from test/test_projects/linter/app_a/src/app_a_ssr.erl
rename to test_projects/linter/app_a/src/app_a_ssr.erl
diff --git a/test/test_projects/linter/app_a/src/app_a_unused_param.erl b/test_projects/linter/app_a/src/app_a_unused_param.erl
similarity index 100%
rename from test/test_projects/linter/app_a/src/app_a_unused_param.erl
rename to test_projects/linter/app_a/src/app_a_unused_param.erl
diff --git a/test/test_projects/linter/app_a/src/custom_function_matches.erl b/test_projects/linter/app_a/src/custom_function_matches.erl
similarity index 100%
rename from test/test_projects/linter/app_a/src/custom_function_matches.erl
rename to test_projects/linter/app_a/src/custom_function_matches.erl
diff --git a/test/test_projects/linter/app_a/src/expression_updates_literal.erl b/test_projects/linter/app_a/src/expression_updates_literal.erl
similarity index 100%
rename from test/test_projects/linter/app_a/src/expression_updates_literal.erl
rename to test_projects/linter/app_a/src/expression_updates_literal.erl
diff --git a/test/test_projects/linter/app_a/src/spelling.erl b/test_projects/linter/app_a/src/spelling.erl
similarity index 100%
rename from test/test_projects/linter/app_a/src/spelling.erl
rename to test_projects/linter/app_a/src/spelling.erl
diff --git a/test/test_projects/linter/app_a/test/app_a_SUITE.erl b/test_projects/linter/app_a/test/app_a_SUITE.erl
similarity index 100%
rename from test/test_projects/linter/app_a/test/app_a_SUITE.erl
rename to test_projects/linter/app_a/test/app_a_SUITE.erl
diff --git a/test/test_projects/linter/app_a/test/app_a_test_helpers.erl b/test_projects/linter/app_a/test/app_a_test_helpers.erl
similarity index 100%
rename from test/test_projects/linter/app_a/test/app_a_test_helpers.erl
rename to test_projects/linter/app_a/test/app_a_test_helpers.erl
diff --git a/test/test_projects/linter/app_a/test/app_a_test_helpers_not_opted_in.erl b/test_projects/linter/app_a/test/app_a_test_helpers_not_opted_in.erl
similarity index 100%
rename from test/test_projects/linter/app_a/test/app_a_test_helpers_not_opted_in.erl
rename to test_projects/linter/app_a/test/app_a_test_helpers_not_opted_in.erl
diff --git a/test/test_projects/linter/app_a/test/app_a_unreachable_test_SUITE.erl b/test_projects/linter/app_a/test/app_a_unreachable_test_SUITE.erl
similarity index 100%
rename from test/test_projects/linter/app_a/test/app_a_unreachable_test_SUITE.erl
rename to test_projects/linter/app_a/test/app_a_unreachable_test_SUITE.erl
diff --git a/test/test_projects/linter/app_a/test/app_test_helpers_no_errors.erl b/test_projects/linter/app_a/test/app_test_helpers_no_errors.erl
similarity index 100%
rename from test/test_projects/linter/app_a/test/app_test_helpers_no_errors.erl
rename to test_projects/linter/app_a/test/app_test_helpers_no_errors.erl
diff --git a/test/test_projects/linter/app_b/src/app_b.app.src b/test_projects/linter/app_b/src/app_b.app.src
similarity index 100%
rename from test/test_projects/linter/app_b/src/app_b.app.src
rename to test_projects/linter/app_b/src/app_b.app.src
diff --git a/test/test_projects/linter/app_b/src/app_b.erl b/test_projects/linter/app_b/src/app_b.erl
similarity index 100%
rename from test/test_projects/linter/app_b/src/app_b.erl
rename to test_projects/linter/app_b/src/app_b.erl
diff --git a/test/test_projects/linter/app_b/src/app_b_unused_param.erl b/test_projects/linter/app_b/src/app_b_unused_param.erl
similarity index 100%
rename from test/test_projects/linter/app_b/src/app_b_unused_param.erl
rename to test_projects/linter/app_b/src/app_b_unused_param.erl
diff --git a/test/test_projects/linter/elp_lint_adhoc.toml b/test_projects/linter/elp_lint_adhoc.toml
similarity index 100%
rename from test/test_projects/linter/elp_lint_adhoc.toml
rename to test_projects/linter/elp_lint_adhoc.toml
diff --git a/test/test_projects/linter/elp_lint_custom_function_matches.toml b/test_projects/linter/elp_lint_custom_function_matches.toml
similarity index 100%
rename from test/test_projects/linter/elp_lint_custom_function_matches.toml
rename to test_projects/linter/elp_lint_custom_function_matches.toml
diff --git a/test/test_projects/linter/elp_lint_ssr_adhoc.toml b/test_projects/linter/elp_lint_ssr_adhoc.toml
similarity index 100%
rename from test/test_projects/linter/elp_lint_ssr_adhoc.toml
rename to test_projects/linter/elp_lint_ssr_adhoc.toml
diff --git a/test/test_projects/linter/elp_lint_ssr_adhoc_parse_fail.toml b/test_projects/linter/elp_lint_ssr_adhoc_parse_fail.toml
similarity index 100%
rename from test/test_projects/linter/elp_lint_ssr_adhoc_parse_fail.toml
rename to test_projects/linter/elp_lint_ssr_adhoc_parse_fail.toml
diff --git a/test/test_projects/linter/elp_lint_test1.toml b/test_projects/linter/elp_lint_test1.toml
similarity index 100%
rename from test/test_projects/linter/elp_lint_test1.toml
rename to test_projects/linter/elp_lint_test1.toml
diff --git a/test/test_projects/linter/elp_lint_test2.toml b/test_projects/linter/elp_lint_test2.toml
similarity index 100%
rename from test/test_projects/linter/elp_lint_test2.toml
rename to test_projects/linter/elp_lint_test2.toml
diff --git a/test/test_projects/linter/elp_lint_test_ignore.toml b/test_projects/linter/elp_lint_test_ignore.toml
similarity index 100%
rename from test/test_projects/linter/elp_lint_test_ignore.toml
rename to test_projects/linter/elp_lint_test_ignore.toml
diff --git a/test/test_projects/linter/elp_lint_warnings_as_errors.toml b/test_projects/linter/elp_lint_warnings_as_errors.toml
similarity index 100%
rename from test/test_projects/linter/elp_lint_warnings_as_errors.toml
rename to test_projects/linter/elp_lint_warnings_as_errors.toml
diff --git a/test/test_projects/linter/rebar.config b/test_projects/linter/rebar.config
similarity index 100%
rename from test/test_projects/linter/rebar.config
rename to test_projects/linter/rebar.config
diff --git a/test_projects/linter_bad_config/.elp.toml b/test_projects/linter_bad_config/.elp.toml
new file mode 100644
index 0000000000..a887ab835c
--- /dev/null
+++ b/test_projects/linter_bad_config/.elp.toml
@@ -0,0 +1,5 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "fbcode//whatsapp/elp/test_projects/linter/..." ]
+source_root = "whatsapp/elp/test_projects/linter"
diff --git a/test/test_projects/linter_bad_config/.elp_lint.toml b/test_projects/linter_bad_config/.elp_lint.toml
similarity index 100%
rename from test/test_projects/linter_bad_config/.elp_lint.toml
rename to test_projects/linter_bad_config/.elp_lint.toml
diff --git a/test/test_projects/linter_bad_config/.gitignore b/test_projects/linter_bad_config/.gitignore
similarity index 100%
rename from test/test_projects/linter_bad_config/.gitignore
rename to test_projects/linter_bad_config/.gitignore
diff --git a/test/test_projects/linter_bad_config/app_a/include/app_a.hrl b/test_projects/linter_bad_config/app_a/include/app_a.hrl
similarity index 100%
rename from test/test_projects/linter_bad_config/app_a/include/app_a.hrl
rename to test_projects/linter_bad_config/app_a/include/app_a.hrl
diff --git a/test/test_projects/linter_bad_config/app_a/src/app_a.app.src b/test_projects/linter_bad_config/app_a/src/app_a.app.src
similarity index 100%
rename from test/test_projects/linter_bad_config/app_a/src/app_a.app.src
rename to test_projects/linter_bad_config/app_a/src/app_a.app.src
diff --git a/test/test_projects/linter_bad_config/app_a/src/app_a.erl b/test_projects/linter_bad_config/app_a/src/app_a.erl
similarity index 100%
rename from test/test_projects/linter_bad_config/app_a/src/app_a.erl
rename to test_projects/linter_bad_config/app_a/src/app_a.erl
diff --git a/test_projects/linter_bad_config/linter/.elp.toml b/test_projects/linter_bad_config/linter/.elp.toml
new file mode 100644
index 0000000000..a887ab835c
--- /dev/null
+++ b/test_projects/linter_bad_config/linter/.elp.toml
@@ -0,0 +1,5 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "fbcode//whatsapp/elp/test_projects/linter/..." ]
+source_root = "whatsapp/elp/test_projects/linter"
diff --git a/test/test_projects/linter_bad_config/linter/.elp_lint.toml b/test_projects/linter_bad_config/linter/.elp_lint.toml
similarity index 100%
rename from test/test_projects/linter_bad_config/linter/.elp_lint.toml
rename to test_projects/linter_bad_config/linter/.elp_lint.toml
diff --git a/test/test_projects/linter_bad_config/linter/.gitignore b/test_projects/linter_bad_config/linter/.gitignore
similarity index 100%
rename from test/test_projects/linter_bad_config/linter/.gitignore
rename to test_projects/linter_bad_config/linter/.gitignore
diff --git a/test/test_projects/linter_bad_config/linter/app_a/include/app_a.hrl b/test_projects/linter_bad_config/linter/app_a/include/app_a.hrl
similarity index 100%
rename from test/test_projects/linter_bad_config/linter/app_a/include/app_a.hrl
rename to test_projects/linter_bad_config/linter/app_a/include/app_a.hrl
diff --git a/test/test_projects/linter_bad_config/linter/app_a/src/app_a.app.src b/test_projects/linter_bad_config/linter/app_a/src/app_a.app.src
similarity index 100%
rename from test/test_projects/linter_bad_config/linter/app_a/src/app_a.app.src
rename to test_projects/linter_bad_config/linter/app_a/src/app_a.app.src
diff --git a/test/test_projects/linter_bad_config/linter/app_a/src/app_a.erl b/test_projects/linter_bad_config/linter/app_a/src/app_a.erl
similarity index 100%
rename from test/test_projects/linter_bad_config/linter/app_a/src/app_a.erl
rename to test_projects/linter_bad_config/linter/app_a/src/app_a.erl
diff --git a/test/test_projects/linter_bad_config/linter/app_a/src/app_a_unused_param.erl b/test_projects/linter_bad_config/linter/app_a/src/app_a_unused_param.erl
similarity index 100%
rename from test/test_projects/linter_bad_config/linter/app_a/src/app_a_unused_param.erl
rename to test_projects/linter_bad_config/linter/app_a/src/app_a_unused_param.erl
diff --git a/test/test_projects/linter_bad_config/linter/app_a/test/app_a_SUITE.erl b/test_projects/linter_bad_config/linter/app_a/test/app_a_SUITE.erl
similarity index 100%
rename from test/test_projects/linter_bad_config/linter/app_a/test/app_a_SUITE.erl
rename to test_projects/linter_bad_config/linter/app_a/test/app_a_SUITE.erl
diff --git a/test/test_projects/linter_bad_config/linter/app_a/test/app_a_test_helpers.erl b/test_projects/linter_bad_config/linter/app_a/test/app_a_test_helpers.erl
similarity index 100%
rename from test/test_projects/linter_bad_config/linter/app_a/test/app_a_test_helpers.erl
rename to test_projects/linter_bad_config/linter/app_a/test/app_a_test_helpers.erl
diff --git a/test/test_projects/linter_bad_config/linter/app_a/test/app_a_test_helpers_not_opted_in.erl b/test_projects/linter_bad_config/linter/app_a/test/app_a_test_helpers_not_opted_in.erl
similarity index 100%
rename from test/test_projects/linter_bad_config/linter/app_a/test/app_a_test_helpers_not_opted_in.erl
rename to test_projects/linter_bad_config/linter/app_a/test/app_a_test_helpers_not_opted_in.erl
diff --git a/test/test_projects/linter_bad_config/linter/app_a/test/app_test_helpers_no_errors.erl b/test_projects/linter_bad_config/linter/app_a/test/app_test_helpers_no_errors.erl
similarity index 100%
rename from test/test_projects/linter_bad_config/linter/app_a/test/app_test_helpers_no_errors.erl
rename to test_projects/linter_bad_config/linter/app_a/test/app_test_helpers_no_errors.erl
diff --git a/test/test_projects/linter_bad_config/linter/app_b/src/app_b.app.src b/test_projects/linter_bad_config/linter/app_b/src/app_b.app.src
similarity index 100%
rename from test/test_projects/linter_bad_config/linter/app_b/src/app_b.app.src
rename to test_projects/linter_bad_config/linter/app_b/src/app_b.app.src
diff --git a/test/test_projects/linter_bad_config/linter/app_b/src/app_b.erl b/test_projects/linter_bad_config/linter/app_b/src/app_b.erl
similarity index 100%
rename from test/test_projects/linter_bad_config/linter/app_b/src/app_b.erl
rename to test_projects/linter_bad_config/linter/app_b/src/app_b.erl
diff --git a/test/test_projects/linter_bad_config/linter/app_b/src/app_b_unused_param.erl b/test_projects/linter_bad_config/linter/app_b/src/app_b_unused_param.erl
similarity index 100%
rename from test/test_projects/linter_bad_config/linter/app_b/src/app_b_unused_param.erl
rename to test_projects/linter_bad_config/linter/app_b/src/app_b_unused_param.erl
diff --git a/test/test_projects/linter_bad_config/linter/rebar.config b/test_projects/linter_bad_config/linter/rebar.config
similarity index 100%
rename from test/test_projects/linter_bad_config/linter/rebar.config
rename to test_projects/linter_bad_config/linter/rebar.config
diff --git a/test/test_projects/linter_bad_config/rebar.config b/test_projects/linter_bad_config/rebar.config
similarity index 100%
rename from test/test_projects/linter_bad_config/rebar.config
rename to test_projects/linter_bad_config/rebar.config
diff --git a/test_projects/parse_error/.elp.toml b/test_projects/parse_error/.elp.toml
new file mode 100644
index 0000000000..bf2c1ad580
--- /dev/null
+++ b/test_projects/parse_error/.elp.toml
@@ -0,0 +1,8 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "fbcode//whatsapp/elp/test_projects/parse_error/..." ]
+source_root = "whatsapp/elp/test_projects/parse_error"
+
+[eqwalizer]
+enable_all = false
diff --git a/test/test_projects/parse_error/.gitignore b/test_projects/parse_error/.gitignore
similarity index 100%
rename from test/test_projects/parse_error/.gitignore
rename to test_projects/parse_error/.gitignore
diff --git a/test/test_projects/parse_error/.rebar.root b/test_projects/parse_error/.rebar.root
similarity index 100%
rename from test/test_projects/parse_error/.rebar.root
rename to test_projects/parse_error/.rebar.root
diff --git a/test/test_projects/parse_error/eqwalizer/src/eqwalizer.app.src b/test_projects/parse_error/eqwalizer/src/eqwalizer.app.src
similarity index 100%
rename from test/test_projects/parse_error/eqwalizer/src/eqwalizer.app.src
rename to test_projects/parse_error/eqwalizer/src/eqwalizer.app.src
diff --git a/test/test_projects/parse_error/eqwalizer/src/eqwalizer.erl b/test_projects/parse_error/eqwalizer/src/eqwalizer.erl
similarity index 100%
rename from test/test_projects/parse_error/eqwalizer/src/eqwalizer.erl
rename to test_projects/parse_error/eqwalizer/src/eqwalizer.erl
diff --git a/test/test_projects/parse_error/eqwalizer/src/eqwalizer_specs.erl b/test_projects/parse_error/eqwalizer/src/eqwalizer_specs.erl
similarity index 100%
rename from test/test_projects/parse_error/eqwalizer/src/eqwalizer_specs.erl
rename to test_projects/parse_error/eqwalizer/src/eqwalizer_specs.erl
diff --git a/test/test_projects/parse_error/parse_error_a/src/parse_error_a.app.src b/test_projects/parse_error/parse_error_a/src/parse_error_a.app.src
similarity index 100%
rename from test/test_projects/parse_error/parse_error_a/src/parse_error_a.app.src
rename to test_projects/parse_error/parse_error_a/src/parse_error_a.app.src
diff --git a/test/test_projects/parse_error/parse_error_a/src/parse_error_a.erl b/test_projects/parse_error/parse_error_a/src/parse_error_a.erl
similarity index 100%
rename from test/test_projects/parse_error/parse_error_a/src/parse_error_a.erl
rename to test_projects/parse_error/parse_error_a/src/parse_error_a.erl
diff --git a/test/test_projects/parse_error/parse_error_a/src/parse_error_a_bad.erl b/test_projects/parse_error/parse_error_a/src/parse_error_a_bad.erl
similarity index 100%
rename from test/test_projects/parse_error/parse_error_a/src/parse_error_a_bad.erl
rename to test_projects/parse_error/parse_error_a/src/parse_error_a_bad.erl
diff --git a/test/test_projects/parse_error/parse_error_a/src/parse_error_a_reference_bad.erl b/test_projects/parse_error/parse_error_a/src/parse_error_a_reference_bad.erl
similarity index 100%
rename from test/test_projects/parse_error/parse_error_a/src/parse_error_a_reference_bad.erl
rename to test_projects/parse_error/parse_error_a/src/parse_error_a_reference_bad.erl
diff --git a/test/test_projects/parse_error/parse_error_a/src/parse_error_a_syntax_error.erl b/test_projects/parse_error/parse_error_a/src/parse_error_a_syntax_error.erl
similarity index 100%
rename from test/test_projects/parse_error/parse_error_a/src/parse_error_a_syntax_error.erl
rename to test_projects/parse_error/parse_error_a/src/parse_error_a_syntax_error.erl
diff --git a/test/test_projects/parse_error/parse_error_a/src/parse_error_a_worst.erl b/test_projects/parse_error/parse_error_a/src/parse_error_a_worst.erl
similarity index 100%
rename from test/test_projects/parse_error/parse_error_a/src/parse_error_a_worst.erl
rename to test_projects/parse_error/parse_error_a/src/parse_error_a_worst.erl
diff --git a/test/test_projects/parse_error/rebar.config b/test_projects/parse_error/rebar.config
similarity index 100%
rename from test/test_projects/parse_error/rebar.config
rename to test_projects/parse_error/rebar.config
diff --git a/test_projects/standard/.elp.toml b/test_projects/standard/.elp.toml
new file mode 100644
index 0000000000..09ff5a4d5a
--- /dev/null
+++ b/test_projects/standard/.elp.toml
@@ -0,0 +1,5 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "fbcode//whatsapp/elp/test_projects/standard/..." ]
+source_root = "whatsapp/elp/test_projects/standard"
diff --git a/test/test_projects/standard/.gitignore b/test_projects/standard/.gitignore
similarity index 100%
rename from test/test_projects/standard/.gitignore
rename to test_projects/standard/.gitignore
diff --git a/test/test_projects/standard/.rebar.root b/test_projects/standard/.rebar.root
similarity index 100%
rename from test/test_projects/standard/.rebar.root
rename to test_projects/standard/.rebar.root
diff --git a/test/test_projects/standard/app_a/.eqwalizer b/test_projects/standard/app_a/.eqwalizer
similarity index 100%
rename from test/test_projects/standard/app_a/.eqwalizer
rename to test_projects/standard/app_a/.eqwalizer
diff --git a/test/test_projects/standard/app_a/extra/app_a.erl b/test_projects/standard/app_a/extra/app_a.erl
similarity index 100%
rename from test/test_projects/standard/app_a/extra/app_a.erl
rename to test_projects/standard/app_a/extra/app_a.erl
diff --git a/test/test_projects/standard/app_a/include/app_a.hrl b/test_projects/standard/app_a/include/app_a.hrl
similarity index 100%
rename from test/test_projects/standard/app_a/include/app_a.hrl
rename to test_projects/standard/app_a/include/app_a.hrl
diff --git a/test/test_projects/linter_config/app_a/src/app_a.app.src b/test_projects/standard/app_a/src/app_a.app.src
similarity index 100%
rename from test/test_projects/linter_config/app_a/src/app_a.app.src
rename to test_projects/standard/app_a/src/app_a.app.src
diff --git a/test/test_projects/standard/app_a/src/app_a.erl b/test_projects/standard/app_a/src/app_a.erl
similarity index 100%
rename from test/test_projects/standard/app_a/src/app_a.erl
rename to test_projects/standard/app_a/src/app_a.erl
diff --git a/test/test_projects/standard/app_a/src/app_a_errors_generated.erl b/test_projects/standard/app_a/src/app_a_errors_generated.erl
similarity index 100%
rename from test/test_projects/standard/app_a/src/app_a_errors_generated.erl
rename to test_projects/standard/app_a/src/app_a_errors_generated.erl
diff --git a/test/test_projects/standard/app_a/src/app_a_fixme.erl b/test_projects/standard/app_a/src/app_a_fixme.erl
similarity index 100%
rename from test/test_projects/standard/app_a/src/app_a_fixme.erl
rename to test_projects/standard/app_a/src/app_a_fixme.erl
diff --git a/test/test_projects/standard/app_a/src/app_a_ignored.erl b/test_projects/standard/app_a/src/app_a_ignored.erl
similarity index 100%
rename from test/test_projects/standard/app_a/src/app_a_ignored.erl
rename to test_projects/standard/app_a/src/app_a_ignored.erl
diff --git a/test/test_projects/standard/app_a/src/app_a_lists.erl b/test_projects/standard/app_a/src/app_a_lists.erl
similarity index 100%
rename from test/test_projects/standard/app_a/src/app_a_lists.erl
rename to test_projects/standard/app_a/src/app_a_lists.erl
diff --git a/test/test_projects/standard/app_a/src/app_a_mod2.erl b/test_projects/standard/app_a/src/app_a_mod2.erl
similarity index 100%
rename from test/test_projects/standard/app_a/src/app_a_mod2.erl
rename to test_projects/standard/app_a/src/app_a_mod2.erl
diff --git a/test/test_projects/standard/app_a/src/app_a_no_errors.erl b/test_projects/standard/app_a/src/app_a_no_errors.erl
similarity index 100%
rename from test/test_projects/standard/app_a/src/app_a_no_errors.erl
rename to test_projects/standard/app_a/src/app_a_no_errors.erl
diff --git a/test/test_projects/standard/app_a/src/app_a_no_errors_generated.erl b/test_projects/standard/app_a/src/app_a_no_errors_generated.erl
similarity index 100%
rename from test/test_projects/standard/app_a/src/app_a_no_errors_generated.erl
rename to test_projects/standard/app_a/src/app_a_no_errors_generated.erl
diff --git a/test/test_projects/standard/app_a/src/app_a_no_errors_opted_in.erl b/test_projects/standard/app_a/src/app_a_no_errors_opted_in.erl
similarity index 100%
rename from test/test_projects/standard/app_a/src/app_a_no_errors_opted_in.erl
rename to test_projects/standard/app_a/src/app_a_no_errors_opted_in.erl
diff --git a/test/test_projects/standard/app_a/test/app_a_SUITE.erl b/test_projects/standard/app_a/test/app_a_SUITE.erl
similarity index 100%
rename from test/test_projects/standard/app_a/test/app_a_SUITE.erl
rename to test_projects/standard/app_a/test/app_a_SUITE.erl
diff --git a/test/test_projects/standard/app_a/test/app_a_test_helpers.erl b/test_projects/standard/app_a/test/app_a_test_helpers.erl
similarity index 100%
rename from test/test_projects/standard/app_a/test/app_a_test_helpers.erl
rename to test_projects/standard/app_a/test/app_a_test_helpers.erl
diff --git a/test/test_projects/standard/app_a/test/app_a_test_helpers_not_opted_in.erl b/test_projects/standard/app_a/test/app_a_test_helpers_not_opted_in.erl
similarity index 100%
rename from test/test_projects/standard/app_a/test/app_a_test_helpers_not_opted_in.erl
rename to test_projects/standard/app_a/test/app_a_test_helpers_not_opted_in.erl
diff --git a/test/test_projects/standard/app_a/test/app_test_helpers_no_errors.erl b/test_projects/standard/app_a/test/app_test_helpers_no_errors.erl
similarity index 100%
rename from test/test_projects/standard/app_a/test/app_test_helpers_no_errors.erl
rename to test_projects/standard/app_a/test/app_test_helpers_no_errors.erl
diff --git a/test/test_projects/linter_config/app_b/src/app_b.app.src b/test_projects/standard/app_b/src/app_b.app.src
similarity index 100%
rename from test/test_projects/linter_config/app_b/src/app_b.app.src
rename to test_projects/standard/app_b/src/app_b.app.src
diff --git a/test/test_projects/standard/app_b/src/app_b.erl b/test_projects/standard/app_b/src/app_b.erl
similarity index 100%
rename from test/test_projects/standard/app_b/src/app_b.erl
rename to test_projects/standard/app_b/src/app_b.erl
diff --git a/test/test_projects/standard/eqwalizer/src/eqwalizer.app.src b/test_projects/standard/eqwalizer/src/eqwalizer.app.src
similarity index 100%
rename from test/test_projects/standard/eqwalizer/src/eqwalizer.app.src
rename to test_projects/standard/eqwalizer/src/eqwalizer.app.src
diff --git a/test/test_projects/standard/eqwalizer/src/eqwalizer.erl b/test_projects/standard/eqwalizer/src/eqwalizer.erl
similarity index 100%
rename from test/test_projects/standard/eqwalizer/src/eqwalizer.erl
rename to test_projects/standard/eqwalizer/src/eqwalizer.erl
diff --git a/test/test_projects/standard/eqwalizer/src/eqwalizer_specs.erl b/test_projects/standard/eqwalizer/src/eqwalizer_specs.erl
similarity index 100%
rename from test/test_projects/standard/eqwalizer/src/eqwalizer_specs.erl
rename to test_projects/standard/eqwalizer/src/eqwalizer_specs.erl
diff --git a/test/test_projects/standard/erlang_ls.config b/test_projects/standard/erlang_ls.config
similarity index 100%
rename from test/test_projects/standard/erlang_ls.config
rename to test_projects/standard/erlang_ls.config
diff --git a/test/test_projects/standard/rebar.config b/test_projects/standard/rebar.config
similarity index 100%
rename from test/test_projects/standard/rebar.config
rename to test_projects/standard/rebar.config
diff --git a/test_projects/xref/.elp.toml b/test_projects/xref/.elp.toml
new file mode 100644
index 0000000000..afda912287
--- /dev/null
+++ b/test_projects/xref/.elp.toml
@@ -0,0 +1,5 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "fbcode//whatsapp/elp/test_projects/xref/..." ]
+source_root = "whatsapp/elp/test_projects/xref"
diff --git a/test/test_projects/xref/app_a/src/unavailable_type.erl b/test_projects/xref/app_a/src/unavailable_type.erl
similarity index 100%
rename from test/test_projects/xref/app_a/src/unavailable_type.erl
rename to test_projects/xref/app_a/src/unavailable_type.erl
diff --git a/test/test_projects/xref/app_b/src/app_b.erl b/test_projects/xref/app_b/src/app_b.erl
similarity index 100%
rename from test/test_projects/xref/app_b/src/app_b.erl
rename to test_projects/xref/app_b/src/app_b.erl
diff --git a/test/test_projects/xref/app_c/src/app_c.erl b/test_projects/xref/app_c/src/app_c.erl
similarity index 100%
rename from test/test_projects/xref/app_c/src/app_c.erl
rename to test_projects/xref/app_c/src/app_c.erl
diff --git a/test/test_projects/xref/elp_lint_unavailable_type.toml b/test_projects/xref/elp_lint_unavailable_type.toml
similarity index 100%
rename from test/test_projects/xref/elp_lint_unavailable_type.toml
rename to test_projects/xref/elp_lint_unavailable_type.toml
diff --git a/website/docs/erlang-error-index/w/W0060.md b/website/docs/erlang-error-index/w/W0060.md
deleted file mode 100644
index 91b972dacf..0000000000
--- a/website/docs/erlang-error-index/w/W0060.md
+++ /dev/null
@@ -1,48 +0,0 @@
----
-sidebar_position: 60
----
-
-# W0060 - Bound Variable in LHS
-
-## Error
-
-```erlang
-handle_request(Message) ->
-  Message = next_action().
-%% ^^^^^^^ 💡 warning: W0060: Match on a bound variable
-```
-
-## Explanation
-
-This diagnostic flags cases where a variable that is already bound appears on the left-hand side (LHS) of a match expression. This can be problematic if the binding is not intentional and can lead to subtle bugs.
-
-Consider the following code snippet:
-
-```erlang showLineNumbers
-foo() ->
-    AA = foo(),
-    AA = bar().
-```
-
-The pattern on line `3` will only match if and only if the result of the call to `bar/0` is the same as the call to `foo/0`. This behaviour could be intentional or not. If not, it can easily lead to bugs.
-
-An alternative, more explicit, way to express that behaviour - when intentional - could be:
-
-```erlang showLineNumbers
-foo() ->
-    AA = foo(),
-    BB = bar(),
-    AA = BB.
-```
-
-Or using an assertion:
-
-```erlang showLineNumbers
-foo() ->
-    AA = foo(),
-    ?assertEqual(AA, bar()).
-```
-
-## Semantic highlighting
-
-Note that we also have semantic highlighting of the more general case, where a bound variable appears in any pattern.
diff --git a/website/docs/get-started/editors/emacs.md b/website/docs/get-started/editors/emacs.md
index fab357f4a4..072e6902da 100644
--- a/website/docs/get-started/editors/emacs.md
+++ b/website/docs/get-started/editors/emacs.md
@@ -37,8 +37,9 @@ additional configuration options.
 
 ### Semantic tokens
 
-Semantic token support has been added to eglot, but is not yet in the released
-version. But it is possible to install the updated version of eglot.
+Semantic token support has been added to eglot, but is not yet in the
+released version. But it is possible to install the updated version
+of eglot.
 
 To do so, add
 
@@ -51,14 +52,8 @@ to your `init.el`, then run `M-x eglot-upgrade-eglot`
 Once upgraded, add the following to the `(use-package` entry for `eglot`
 
 ```elisp
-(setq-default eglot-workspace-configuration
-                ;; Run `elp config` to see that options can be used here
-                ;; Use `eglot-show-workspace-configuration` to see what is sent
-                '(:elp (:highlightDynamic (:enable t)
-                        :typesOnHover (:enable t) ))
-
-                eglot-semantic-token-modifiers
-                '("bound" "exported_function" "exported_type" "deprecated_function" "type_dynamic"))
+  (setq eglot-semantic-token-modifiers '
+    ("bound" "exported_function" "exported_type" "deprecated_function" "type_dynamic"))
 
   ;; Each face name arises as a template from the modifiers as
   ;; "eglot-semantic-%s-face"
@@ -97,6 +92,7 @@ Once upgraded, add the following to the `(use-package` entry for `eglot`
         (eglot--widening (font-lock-flush)))))
 ```
 
+
 ## lsp-mode
 
 Install the `lsp-mode` package, which is a generic Emacs client for LSP servers.