diff --git a/.cargo/config.toml b/.cargo/config.toml
index 7e4e7a0f90..eb89fa1e55 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -1,8 +1,8 @@
 [alias]
 xtask = "run --package xtask --"
 
-# @fb-only
-# @fb-only
+# @fb-only: [build]
+# @fb-only: target-dir = "../../../buck-out/elp"
 
 [profile.release]
 codegen-units = 1
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cf3834b5ad..e9980283f2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -97,6 +97,8 @@ 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:
@@ -135,7 +137,7 @@ 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 --no-default-features --workspace --target ${{ matrix.target }}'
+        run: 'cargo test --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 51f0340659..7572a84e98 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -4,7 +4,7 @@
         {
             "label": "ELP: build (debug)",
             "type": "shell",
-            // @fb-only
+            // @fb-only: "command": "./meta/cargo.sh build",
             "command": "cargo build", // @oss-only
             "group": {
                 "kind": "build",
@@ -19,7 +19,7 @@
         {
             "label": "ELP: build (release)",
             "type": "shell",
-            // @fb-only
+            // @fb-only: "command": "./meta/cargo.sh build --release",
             "command": "cargo build --release", // @oss-only
             "group": {
                 "kind": "build",
@@ -34,7 +34,7 @@
         {
             "label": "ELP: build (release-thin)",
             "type": "shell",
-            // @fb-only
+            // @fb-only: "command": "./meta/cargo.sh build --profile release-thin --bins",
             "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
+            // @fb-only: "command": "./meta/clippy.sh --workspace --tests",
             "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
+            // @fb-only: "command": "./meta/clippy.sh --workspace --tests --fix",
             "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
+            // @fb-only: "command": "./meta/cargo.sh test --workspace",
             "command": "cargo test --workspace", // @oss-only
             "group": {
                 "kind": "build",
diff --git a/crates/base_db/src/lib.rs b/crates/base_db/src/lib.rs
index 6b3757ff43..0cd8df74c9 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
+// @fb-only: mod meta_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
+        // @fb-only: meta_only::ignored_sources_regexes()
     ];
     regexes.into_iter().flatten().collect::<Vec<Regex>>()
    };
diff --git a/crates/elp/src/arc_types.rs b/crates/elp/src/arc_types.rs
index c113311661..374dcdba2f 100644
--- a/crates/elp/src/arc_types.rs
+++ b/crates/elp/src/arc_types.rs
@@ -8,8 +8,8 @@
  * above-listed licenses.
  */
 
-// @fb-only
-// @fb-only
+// @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
 use std::path::Path;
 
 use serde::Serialize;
diff --git a/crates/elp/src/bin/args.rs b/crates/elp/src/bin/args.rs
index db3bc33df2..c9790e9314 100644
--- a/crates/elp/src/bin/args.rs
+++ b/crates/elp/src/bin/args.rs
@@ -155,8 +155,6 @@ 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
@@ -173,8 +171,6 @@ 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/...
@@ -193,8 +189,6 @@ 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
@@ -217,8 +211,6 @@ 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,
 }
@@ -919,7 +911,7 @@ 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 3e57d69b17..770ab60456 100644
--- a/crates/elp/src/bin/elp_parse_cli.rs
+++ b/crates/elp/src/bin/elp_parse_cli.rs
@@ -176,6 +176,19 @@ 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")?;
@@ -191,13 +204,10 @@ pub fn parse_all(
         }
         res.sort_by(|a, b| a.name.cmp(&b.name));
         let mut err_in_diag = false;
-        let min_severity = args
-            .severity
-            .as_ref()
-            .and_then(|s| parse_severity(s.as_str()));
         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())?;
             }
@@ -205,9 +215,6 @@ pub fn parse_all(
                 let line_index = db.file_line_index(diags.file_id);
                 combined.sort_by(|a, b| a.range.start().cmp(&b.range.start()));
                 for diag in combined {
-                    if !meets_severity_threshold(diag.severity, min_severity) {
-                        continue;
-                    }
                     if args.is_format_json() {
                         err_in_diag = true;
                         let vfs_path = loaded.vfs.file_path(diags.file_id);
diff --git a/crates/elp/src/bin/eqwalizer_cli.rs b/crates/elp/src/bin/eqwalizer_cli.rs
index a91bcdd869..141b2157d0 100644
--- a/crates/elp/src/bin/eqwalizer_cli.rs
+++ b/crates/elp/src/bin/eqwalizer_cli.rs
@@ -186,10 +186,7 @@ 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, args.include_tests)
-                .unwrap()
-                && !otp_file_to_ignore(analysis, file_id)
+            if analysis.should_eqwalize(file_id).unwrap() && !otp_file_to_ignore(analysis, file_id)
             {
                 if args.stats {
                     add_stat(name.to_string());
@@ -269,9 +266,7 @@ 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, args.include_tests)
-                    .unwrap()
+                && analysis.should_eqwalize(file_id).unwrap()
                 && !otp_file_to_ignore(analysis, file_id)
             {
                 Some(file_id)
@@ -339,9 +334,7 @@ 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, args.include_tests)
-                        .unwrap()
+                    if analysis.should_eqwalize(file_id).unwrap()
                         && !otp_file_to_ignore(analysis, file_id)
                     {
                         file_ids.push(file_id);
@@ -408,9 +401,7 @@ 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, args.include_tests)
-                .expect("cancelled")
+            if analysis.should_eqwalize(file_id).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 2a45e450f2..cb420261d2 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
+// @fb-only: mod meta_only;
 
 #[derive(Serialize, Debug, Eq, Hash, PartialEq, Clone)]
 struct GleanFileId(u32);
@@ -994,7 +994,7 @@ impl GleanIndexer {
                 .filter(|text| !text.is_empty())
         });
 
-        // @fb-only
+        // @fb-only: let exdoc_link = elp_ide::meta_only::exdoc_links::module_exdoc_link(&module, &sema);
         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
+                // @fb-only: meta_only::resolve_macro_expansion(sema, *expansion, ctx, &mut resolved);
                 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, false) {
+        if !db.is_eqwalizer_enabled(file_id) {
             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
-        // @fb-only
-        // @fb-only
+        // @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());
         let wam_url = None; // @oss-only
 
         Some(XRef {
diff --git a/crates/elp/src/bin/lint_cli.rs b/crates/elp/src/bin/lint_cli.rs
index f7ac4ff114..241a3d4481 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 initial_diags = {
+    let mut 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
@@ -394,30 +394,54 @@ pub fn do_codemod(
     let mut err_in_diag = streamed_err_in_diag;
     // At this point, the analysis variable from above is dropped
 
-    // 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")?;
+    // 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;
         }
-    } else {
-        if args.apply_fix && diagnostics_config.enabled.all_enabled() {
+    }
+
+    // Handle apply_fix case separately since it needs to filter diagnostics anyway
+    if args.apply_fix {
+        if diagnostics_config.enabled.all_enabled() {
             bail!(
                 "We cannot apply fixes if all diagnostics enabled. Perhaps provide --diagnostic-filter"
             );
         }
-        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(),
-                )?
-            };
+
+        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.skip_stream_print() {
-                initial_diags.sort_by(|(a, _, _), (b, _, _)| a.cmp(b));
+                filtered_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() {
@@ -428,7 +452,7 @@ pub fn do_codemod(
                         &mut err_in_diag,
                         module_count,
                         has_diagnostics,
-                        &initial_diags,
+                        &filtered_diags,
                     )?;
                 } else {
                     {
@@ -442,7 +466,7 @@ pub fn do_codemod(
                             &mut err_in_diag,
                             module_count,
                             has_diagnostics,
-                            &initial_diags,
+                            &filtered_diags,
                         )?;
                         // Analysis is dropped here
                     }
@@ -456,7 +480,7 @@ pub fn do_codemod(
                 &mut loaded.vfs,
                 args,
                 &mut changed_files,
-                initial_diags,
+                filtered_diags,
             );
             // We handle the fix application result here, so
             // the overall status of whether error-severity
@@ -468,8 +492,19 @@ pub fn do_codemod(
                     writeln!(cli, "Apply fix failed: {err:#}").ok();
                 }
             };
+
+            if err_in_diag {
+                bail!("Errors found")
+            }
         }
-        if err_in_diag {
+    } 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 {
             bail!("Errors found")
         }
     }
diff --git a/crates/elp/src/bin/main.rs b/crates/elp/src/bin/main.rs
index e1d26e3e7e..56535e4492 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
+// @fb-only: mod meta_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
+            // @fb-only: meta_only::initialize_telemetry();
         }
     }
 }
@@ -288,7 +288,7 @@ mod tests {
         let (_stdout, stderr, code) = elp(args_vec![
             "parse-all",
             "--project",
-            "../../test_projects/standard",
+            "../../test/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_projects/{project}");
+        let project_path = format!("../../test/test_projects/{project}");
         let tmp = Builder::new().prefix("elp_parse_all_").tempdir().unwrap();
         let (_stdout, _stderr, code) = elp(args_vec![
             "parse-all",
@@ -443,33 +443,34 @@ 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!("{}OTPVersionDependent", "@"))
-                                .unwrap();
+                            regex::bytes::Regex::new(&format!("{}OTP([0-9]+)Only", "@")).unwrap();
                         let contents = analysis.file_text(file_id).unwrap();
-                        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(),
-                                ))
+                        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 (stdout, _) = cli.to_strings();
-                        assert_normalised_file(exp_path, &stdout, project_path.into(), false);
+                        } else {
+                            assert_normalised_file(exp_path, &stdout, project_path.into(), false);
+                        }
                     }
                 }
                 EqwalizerDiagnostics::NoAst { module } => {
@@ -604,10 +605,7 @@ mod tests {
     fn eqwalize_target_diagnostics_match_snapshot_pretty() {
         if cfg!(feature = "buck") {
             simple_snapshot(
-                args_vec![
-                    "eqwalize-target",
-                    "//whatsapp/elp/test_projects/standard:app_a",
-                ],
+                args_vec!["eqwalize-target", "//standard:app_a",],
                 "standard",
                 expect_file!("../resources/test/standard/eqwalize_target_diagnostics.pretty"),
                 true,
@@ -972,7 +970,9 @@ 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()));
+            buck_config.buck_root = Some(AbsPathBuf::assert_utf8(
+                current_dir().unwrap().join(path_str.clone()),
+            ));
             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]/");
@@ -984,38 +984,13 @@ 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": [
                         ""
                       ],
@@ -1023,61 +998,88 @@ mod tests {
                       "macros": {
                         "COMMON_TEST": "true",
                         "TEST": "true"
-                      }
+                      },
+                      "name": "app_a_SUITE",
+                      "src_dirs": []
                     },
                     {
-                      "name": "common",
-                      "dir": "/[prelude]//erlang/common_test/common",
+                      "dir": "/[prelude]//erlang/common_test/test_exec/src",
+                      "extra_src_dirs": [],
+                      "include_dirs": [],
+                      "macros": {},
+                      "name": "test_exec",
                       "src_dirs": [
-                        "src"
-                      ],
+                        ""
+                      ]
+                    },
+                    {
+                      "dir": "/[prelude]//erlang/common_test/common",
                       "extra_src_dirs": [],
                       "include_dirs": [
                         "include"
                       ],
-                      "macros": {}
+                      "macros": {},
+                      "name": "common",
+                      "src_dirs": [
+                        "src"
+                      ]
                     },
                     {
-                      "name": "cth_hooks",
                       "dir": "/[prelude]//erlang/common_test/cth_hooks/src",
-                      "src_dirs": [
-                        ""
-                      ],
                       "extra_src_dirs": [],
                       "include_dirs": [
                         ""
                       ],
-                      "macros": {}
+                      "macros": {},
+                      "name": "cth_hooks",
+                      "src_dirs": [
+                        ""
+                      ]
                     },
                     {
-                      "name": "buck2_shell_utils",
                       "dir": "/[prelude]//erlang/shell/src",
-                      "src_dirs": [
-                        ""
-                      ],
                       "extra_src_dirs": [],
                       "include_dirs": [],
-                      "macros": {}
+                      "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"
+                      ]
                     },
                     {
-                      "name": "test_binary",
                       "dir": "/[prelude]//erlang/common_test/test_binary/src",
-                      "src_dirs": [
-                        ""
-                      ],
                       "extra_src_dirs": [],
                       "include_dirs": [],
-                      "macros": {}
+                      "macros": {},
+                      "name": "test_binary",
+                      "src_dirs": [
+                        ""
+                      ]
                     },
                     {
-                      "name": "test_cli_lib",
                       "dir": "/[prelude]//erlang/common_test/test_cli_lib/src",
-                      "src_dirs": [
-                        ""
-                      ],
                       "extra_src_dirs": [],
                       "include_dirs": [],
-                      "macros": {}
+                      "macros": {},
+                      "name": "test_cli_lib",
+                      "src_dirs": [
+                        ""
+                      ]
                     }
                   ],
                   "deps": []
@@ -1092,6 +1094,12 @@ 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() {
@@ -1105,7 +1113,7 @@ mod tests {
                 "--to",
                 tmp_file.clone(),
                 "--project",
-                path_str
+                path_str.clone()
             ];
             let (stdout, stderr, code) = elp(args);
             assert_eq!(
@@ -1120,7 +1128,9 @@ 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()));
+            buck_config.buck_root = Some(AbsPathBuf::assert_utf8(
+                current_dir().unwrap().join(path_str.clone()),
+            ));
             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]/");
@@ -1444,7 +1454,7 @@ mod tests {
                 "lint",
                 "--experimental",
                 "--config-file",
-                "../../test_projects/linter/does_not_exist.toml"
+                "../../test/test_projects/linter/does_not_exist.toml"
             ],
             "linter",
             expect_file!("../resources/test/linter/parse_elp_lint_custom_config_invalid_output.stdout"),
@@ -1456,7 +1466,7 @@ mod tests {
             &[],
             false,
             Some(expect![[r#"
-                unable to read "../../test_projects/linter/does_not_exist.toml": No such file or directory (os error 2)
+                unable to read "../../test/test_projects/linter/does_not_exist.toml": No such file or directory (os error 2)
             "#]]),
         )
         .expect("bad test");
@@ -1472,7 +1482,7 @@ mod tests {
                 "lint",
                 "--experimental",
                 "--config-file",
-                "../../test_projects/linter/elp_lint_test1.toml"
+                "../../test/test_projects/linter/elp_lint_test1.toml"
             ],
             "linter",
             expect_file!("../resources/test/linter/parse_elp_lint_custom_config_output.stdout"),
@@ -1498,7 +1508,7 @@ mod tests {
                 "lint",
                 "--experimental",
                 "--config-file",
-                "../../test_projects/linter/elp_lint_adhoc.toml",
+                "../../test/test_projects/linter/elp_lint_adhoc.toml",
                 "--module",
                 "app_b",
                 "--apply-fix",
@@ -1529,7 +1539,7 @@ mod tests {
                 "--diagnostic-ignore",
                 "W0011",
                 "--config-file",
-                "../../test_projects/linter/elp_lint_test_ignore.toml"
+                "../../test/test_projects/linter/elp_lint_test_ignore.toml"
             ],
             "linter",
             expect_file!("../resources/test/linter/parse_elp_lint_ignore.stdout"),
@@ -1573,7 +1583,7 @@ mod tests {
             &[],
             false,
             Some(expect![[r#"
-                failed to read "../../test_projects/linter_bad_config/.elp_lint.toml":expected a right bracket, found an identifier at line 6 column 4
+                failed to read "../../test/test_projects/linter_bad_config/.elp_lint.toml":expected a right bracket, found an identifier at line 6 column 4
             "#]]),
         )
         .expect("bad test");
@@ -1591,6 +1601,20 @@ 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) {
@@ -1625,7 +1649,7 @@ mod tests {
             args_vec![
                 "lint",
                 "--config-file",
-                "../../test_projects/linter/elp_lint_test2.toml"
+                "../../test/test_projects/linter/elp_lint_test2.toml"
             ],
             "linter",
             expect_file!("../resources/test/linter/parse_elp_lint_explicit_enable_output.stdout"),
@@ -1928,7 +1952,8 @@ mod tests {
             simple_snapshot_expect_stderror(
                 args_vec!["lint",],
                 "buck_bad_config",
-                expect_file!("../resources/test/buck_bad_config/bxl_error_message.stdout"),
+                // @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
                 true,
                 None,
                 true,
@@ -1943,7 +1968,7 @@ mod tests {
                 "lint",
                 "--no-stream"
                 "--config-file",
-                "../../test_projects/linter/elp_lint_warnings_as_errors.toml"
+                "../../test/test_projects/linter/elp_lint_warnings_as_errors.toml"
             ],
             "linter",
             expect_file!("../resources/test/linter/warnings_as_errors.stdout"),
@@ -1958,7 +1983,7 @@ mod tests {
             args_vec![
                 "lint",
                 "--config-file",
-                "../../test_projects/linter/elp_lint_custom_function_matches.toml",
+                "../../test/test_projects/linter/elp_lint_custom_function_matches.toml",
                 "--module",
                 "custom_function_matches"
             ],
@@ -1975,7 +2000,7 @@ mod tests {
             args_vec![
                 "lint",
                 "--config-file",
-                "../../test_projects/xref/elp_lint_unavailable_type.toml",
+                "../../test/test_projects/xref/elp_lint_unavailable_type.toml",
                 "--module",
                 "unavailable_type"
             ],
@@ -1992,7 +2017,7 @@ mod tests {
             args_vec![
                 "lint",
                 "--config-file",
-                "../../test_projects/linter/elp_lint_ssr_adhoc.toml",
+                "../../test/test_projects/linter/elp_lint_ssr_adhoc.toml",
             ],
             "linter",
             expect_file!("../resources/test/linter/ssr_ad_hoc.stdout"),
@@ -2007,7 +2032,7 @@ mod tests {
             args_vec![
                 "lint",
                 "--config-file",
-                "../../test_projects/linter/elp_lint_ssr_adhoc_parse_fail.toml",
+                "../../test/test_projects/linter/elp_lint_ssr_adhoc_parse_fail.toml",
             ],
             "linter",
             expect_file!("../resources/test/linter/ssr_ad_hoc_parse_fail.stdout"),
@@ -2191,6 +2216,36 @@ 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.
@@ -2208,6 +2263,18 @@ 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) {
@@ -3069,7 +3136,7 @@ mod tests {
     }
 
     fn project_path(project: &str) -> String {
-        format!("../../test_projects/{project}")
+        format!("../../test/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 fe38287629..7ab10459fe 100644
--- a/crates/elp/src/bin/reporting.rs
+++ b/crates/elp/src/bin/reporting.rs
@@ -227,9 +227,6 @@ 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
@@ -238,12 +235,8 @@ 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,
-                eqwalizer_enabled,
-            );
+            let diagnostic =
+                convert::eqwalizer_to_arc_diagnostic(diagnostic, &line_index, relative_path);
             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 84ab218710..13ff79ed36 100644
--- a/crates/elp/src/bin/shell.rs
+++ b/crates/elp/src/bin/shell.rs
@@ -157,10 +157,9 @@ 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" && opt != "--include-tests")
+                        .find(|&opt| opt != "--include-generated")
                     {
                         return Err(ShellError::UnexpectedOption(
                             "eqwalize-app".into(),
@@ -177,7 +176,6 @@ impl ShellCommand {
                             rebar,
                             app: app.into(),
                             include_generated,
-                            include_tests,
                             bail_on_error: false,
                         })));
                     }
@@ -185,10 +183,9 @@ 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" && opt != "--include-tests")
+                        .find(|&opt| opt != "--include-generated")
                     {
                         return Err(ShellError::UnexpectedOption(
                             "eqwalize-all".into(),
@@ -204,7 +201,6 @@ impl ShellCommand {
                         rebar,
                         format: None,
                         include_generated,
-                        include_tests,
                         bail_on_error: false,
                         stats: false,
                         list_modules: false,
@@ -226,10 +222,8 @@ 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 f5729034b2..36f26d4554 100644
--- a/crates/elp/src/bin/ssr_cli.rs
+++ b/crates/elp/src/bin/ssr_cli.rs
@@ -401,6 +401,9 @@ 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 2637eae5a2..681a022261 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
+// @fb-only: use crate::meta_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
+        // @fb-only: meta_only::harmonise_gks(self);
     }
 
     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 3715353c11..c8db07a5d0 100644
--- a/crates/elp/src/convert.rs
+++ b/crates/elp/src/convert.rs
@@ -126,18 +126,11 @@ 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 = 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
-    };
+    let severity = arc_types::Severity::Error;
     // 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 0e9a2e28e6..f462141e39 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
+// @fb-only: mod meta_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
+                // @fb-only: .chain(meta_only::FILES_TO_IGNORE.iter())
                 .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
new file mode 100644
index 0000000000..f5225605a5
--- /dev/null
+++ b/crates/elp/src/resources/test/buck_bad_config/bxl_error_message_oss.stdout
@@ -0,0 +1 @@
+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
new file mode 100644
index 0000000000..eef1c92c6d
--- /dev/null
+++ b/crates/elp/src/resources/test/diagnostics/lint_no_stream.stdout
@@ -0,0 +1,138 @@
+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 7fe610f781..4b0a155055 100644
--- a/crates/elp/src/resources/test/diagnostics/parse_all_diagnostics1.stdout
+++ b/crates/elp/src/resources/test/diagnostics/parse_all_diagnostics1.stdout
@@ -1,9 +1,10 @@
 module specified: diagnostics
 Diagnostics reported in 1 modules:
-  diagnostics: 6
+  diagnostics: 7
       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
index ca3ca245ab..3af8bfb086 100644
--- a/crates/elp/src/resources/test/diagnostics/parse_all_diagnostics_error.stdout
+++ b/crates/elp/src/resources/test/diagnostics/parse_all_diagnostics_error.stdout
@@ -1,5 +1,5 @@
 module specified: diagnostics
 Diagnostics reported in 1 modules:
-  diagnostics: 6
+  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 0c3e5ae9a3..ede82c7c5f 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
@@ -4,3 +4,4 @@
 {"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 5e286c673f..c34c9037db 100644
--- a/crates/elp/src/resources/test/diagnostics/parse_otp27_docstrings.jsonl
+++ b/crates/elp/src/resources/test/diagnostics/parse_otp27_docstrings.jsonl
@@ -1,4 +1,6 @@
 module specified: otp27_docstrings
 Diagnostics reported in 1 modules:
-  otp27_docstrings: 1
+  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
       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
new file mode 100644
index 0000000000..1cef26124c
--- /dev/null
+++ b/crates/elp/src/resources/test/diagnostics/ssr_exclude_generated.stdout
@@ -0,0 +1,2 @@
+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
new file mode 100644
index 0000000000..2b88b6e10c
--- /dev/null
+++ b/crates/elp/src/resources/test/diagnostics/ssr_include_generated.stdout
@@ -0,0 +1,5 @@
+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 43f66a0a3a..67497c4000 100644
--- a/crates/elp/src/resources/test/eqwalize_all_help.stdout
+++ b/crates/elp/src/resources/test/eqwalize_all_help.stdout
@@ -1,11 +1,10 @@
-Usage: [--project PROJECT] [--as PROFILE] [[--format FORMAT]] [--rebar] [--include-tests] [--bail-on-error] [--stats] [--list-modules]
+Usage: [--project PROJECT] [--as PROFILE] [[--format FORMAT]] [--rebar] [--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 eaf1d3126a..bb128f249a 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] [--include-tests] [--rebar] [--bail-on-error] <APP>
+Usage: [--project PROJECT] [--as PROFILE] [--rebar] [--bail-on-error] <APP>
 
 Available positional items:
     <APP>  app name
@@ -6,7 +6,6 @@ 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 eec74e4938..e9a01166dd 100644
--- a/crates/elp/src/resources/test/eqwalize_target_help.stdout
+++ b/crates/elp/src/resources/test/eqwalize_target_help.stdout
@@ -1,10 +1,9 @@
-Usage: [--project PROJECT] [--include-tests] [--bail-on-error] <TARGET>
+Usage: [--project PROJECT] [--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
deleted file mode 100644
index 63be36e638..0000000000
--- a/crates/elp/src/resources/test/eqwalizer_tests/check/callbacks3_neg-OTP-26.pretty
+++ /dev/null
@@ -1,14 +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: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
deleted file mode 100644
index 63be36e638..0000000000
--- a/crates/elp/src/resources/test/eqwalizer_tests/check/callbacks3_neg-OTP-27.pretty
+++ /dev/null
@@ -1,14 +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: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
deleted file mode 100644
index a24c7a6a48..0000000000
--- a/crates/elp/src/resources/test/eqwalizer_tests/check/callbacks3_neg-OTP-28.pretty
+++ /dev/null
@@ -1,14 +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: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
new file mode 100644
index 0000000000..6cb2012096
--- /dev/null
+++ b/crates/elp/src/resources/test/eqwalizer_tests/check/callbacks3_neg.pretty
@@ -0,0 +1,27 @@
+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-27.pretty b/crates/elp/src/resources/test/eqwalizer_tests/check/custom-OTP-27.pretty
deleted file mode 100644
index efc8c47aa0..0000000000
--- a/crates/elp/src/resources/test/eqwalizer_tests/check/custom-OTP-27.pretty
+++ /dev/null
@@ -1,2540 +0,0 @@
-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()
-
-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()
-
-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()
-
-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()
-
-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()
-
-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()
-
-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()
-  }
-
-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'
-
-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'
-
-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()
-
-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()
-
-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()
-  , ... }
-
-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'
-  , ... }
-
-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()
-
-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.
-  ]
-
-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()
-      ]
-    ]
-  ]
-
-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()
-
-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()
-
-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()
-  ]
-
-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()
-
-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.
-
-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.
-
-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.
-
-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.
-
-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.
-  )
-
-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.
-
-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()}
-
-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']
-  )
-
-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.
-
-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]
-  )
-
-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.
-
-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]}
-
-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()]}
-
-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']
-  )
-
-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.
-
-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']
-  )
-
-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']
-
-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.
-  )
-
-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.
-  )
-
-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()]
-  )
-
-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())]
-  )
-
-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()]
-  )
-
-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())]
-  )
-
-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()]
-  )
-
-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())]
-  )
-
-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()]
-  )
-
-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())]
-  )
-
-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()
-  ]
-
-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()
-  ]
-
-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'
-
-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'
-
-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()
-
-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'
-
-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.
-  ]
-
-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.
-  ]
-
-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()
-  ]
-
-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'
-  ]
-
-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.
-  ]
-
-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'
-  ]
-
-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()
-
-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()
-
-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'
-
-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()]}
-
-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'
-
-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'
-
-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'
-
-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()
-  ]
-
-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()
-  ]
-
-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}
-  ]
-
-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.
-
-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.
-
-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.
-
-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.
-
-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()
-
-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()
-  }
-
-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()
-
-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()
-
-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()
-
-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()
-
-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()
-  ]
-
-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()
-
-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()
-
-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()
-
-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()
-
-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.
-
-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()]}
-
-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.
-
-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.
-
-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.
-
-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()
-  , ... }
-
-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.
-
-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()
-  , ... }
-
-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.
-
-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.
-    }
-  ]
-
-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()]}
-
-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()}]}
-
-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()}
-    ]
-  }
-
-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.
-
-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'
-  , ... }
-
-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.
-
-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-OTP-28.pretty b/crates/elp/src/resources/test/eqwalizer_tests/check/custom-OTP-28.pretty
deleted file mode 100644
index 5220990b8f..0000000000
--- a/crates/elp/src/resources/test/eqwalizer_tests/check/custom-OTP-28.pretty
+++ /dev/null
@@ -1,2540 +0,0 @@
-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()
-
-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()
-
-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()
-
-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()
-
-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()
-
-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()
-
-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()
-  }
-
-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'
-
-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'
-
-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()
-
-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()
-
-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()
-  , ... }
-
-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'
-  , ... }
-
-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()
-
-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.
-  ]
-
-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()
-      ]
-    ]
-  ]
-
-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()
-
-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()
-
-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()
-  ]
-
-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()
-
-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.
-
-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.
-
-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.
-
-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.
-
-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.
-  )
-
-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.
-
-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()}
-
-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']
-  )
-
-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.
-
-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]
-  )
-
-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.
-
-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]}
-
-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()]}
-
-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']
-  )
-
-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.
-
-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']
-  )
-
-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']
-
-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.
-  )
-
-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.
-  )
-
-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()]
-  )
-
-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())]
-  )
-
-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()]
-  )
-
-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())]
-  )
-
-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()]
-  )
-
-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())]
-  )
-
-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()]
-  )
-
-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())]
-  )
-
-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()
-  ]
-
-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()
-  ]
-
-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'
-
-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'
-
-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()
-
-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'
-
-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.
-  ]
-
-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.
-  ]
-
-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()
-  ]
-
-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'
-  ]
-
-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.
-  ]
-
-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'
-  ]
-
-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()
-
-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()
-
-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'
-
-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()]}
-
-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'
-
-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'
-
-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'
-
-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()
-  ]
-
-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()
-  ]
-
-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}
-  ]
-
-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.
-
-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.
-
-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.
-
-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.
-
-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()
-
-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()
-  }
-
-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()
-
-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()
-
-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()
-
-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()
-
-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()
-  ]
-
-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()
-
-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()
-
-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()
-
-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()
-
-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.
-
-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()]}
-
-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.
-
-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.
-
-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.
-
-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()
-  , ... }
-
-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.
-
-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()
-  , ... }
-
-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.
-
-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.
-    }
-  ]
-
-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()]}
-
-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()}]}
-
-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()}
-    ]
-  }
-
-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.
-
-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'
-  , ... }
-
-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.
-
-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-OTP-26.pretty b/crates/elp/src/resources/test/eqwalizer_tests/check/custom.pretty
similarity index 100%
rename from crates/elp/src/resources/test/eqwalizer_tests/check/custom-OTP-26.pretty
rename to crates/elp/src/resources/test/eqwalizer_tests/check/custom.pretty
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 3d59c453e3..5a42009118 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_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
+app_a/src/app_a_unused_param.erl:5:5-5:6::[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 6e07ea2bba..7b6a1e705c 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
@@ -5,6 +5,8 @@
 {"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 9f7a5405b4..5bcd503e10 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
@@ -8,6 +8,8 @@ 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 00d8506230..01007e94c4 100644
--- a/crates/elp/src/resources/test/linter/warnings_as_errors.stdout
+++ b/crates/elp/src/resources/test/linter/warnings_as_errors.stdout
@@ -8,6 +8,8 @@ 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
new file mode 100644
index 0000000000..946fd7dc9a
--- /dev/null
+++ b/crates/elp/src/resources/test/linter_config/basic.stdout
@@ -0,0 +1,5 @@
+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/standard/eqwalize_all_bail_on_error_failure.pretty b/crates/elp/src/resources/test/standard/eqwalize_all_bail_on_error_failure.pretty
index bfbe45f508..1d868bbbc6 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
@@ -192,6 +192,14 @@ 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
    │
@@ -200,4 +208,4 @@ error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types
 Expression has type:   [T]
 Context expected type: T
 
-20 ERRORS
+21 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 8636389098..b311705d68 100644
--- a/crates/elp/src/resources/test/standard/eqwalize_all_diagnostics.jsonl
+++ b/crates/elp/src/resources/test/standard/eqwalize_all_diagnostics.jsonl
@@ -17,4 +17,5 @@
 {"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 bfbe45f508..1d868bbbc6 100644
--- a/crates/elp/src/resources/test/standard/eqwalize_all_diagnostics.pretty
+++ b/crates/elp/src/resources/test/standard/eqwalize_all_diagnostics.pretty
@@ -192,6 +192,14 @@ 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
    │
@@ -200,4 +208,4 @@ error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types
 Expression has type:   [T]
 Context expected type: T
 
-20 ERRORS
+21 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 8636389098..b311705d68 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
@@ -17,4 +17,5 @@
 {"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 67d78913b6..043aa00af0 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
@@ -192,4 +192,12 @@ error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types
 Expression has type:   'wrong_ret'
 Context expected type: 'error'
 
-19 ERRORS
+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
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 67d78913b6..043aa00af0 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
@@ -192,4 +192,12 @@ error: incompatible_types (See https://fb.me/eqwalizer_errors#incompatible_types
 Expression has type:   'wrong_ret'
 Context expected type: 'error'
 
-19 ERRORS
+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
diff --git a/crates/elp/src/resources/test/xref/unavailable_type.stdout b/crates/elp/src/resources/test/xref/unavailable_type.stdout
index 7064c359ff..688be17de3 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 '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').
+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').
diff --git a/crates/elp/src/server.rs b/crates/elp/src/server.rs
index 65c75a1bbc..98890640bc 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, false) {
+                match snapshot.analysis.should_eqwalize(file_id) {
                     Ok(true) => {
                         files.push(file_id);
                     }
diff --git a/crates/elp/src/server/setup.rs b/crates/elp/src/server/setup.rs
index 8dba975e73..4b8615e07c 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
+// @fb-only: use crate::meta_only::get_log_dir;
 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
+        // @fb-only: let log_dir = get_log_dir();
         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 e79251f73a..69ea6b97e0 100644
--- a/crates/elp/src/snapshot.rs
+++ b/crates/elp/src/snapshot.rs
@@ -36,9 +36,11 @@ 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;
@@ -186,6 +188,14 @@ 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,
@@ -193,7 +203,7 @@ impl Snapshot {
     ) -> Result<()> {
         let _ = self.analysis.def_map(file_id)?;
         if optimize_for_eqwalizer {
-            let should_eqwalize = self.analysis.should_eqwalize(file_id, false)?;
+            let should_eqwalize = self.analysis.should_eqwalize(file_id)?;
             if should_eqwalize {
                 let _ = self.analysis.module_ast(file_id)?;
             }
@@ -242,7 +252,7 @@ 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, false) {
+                if let Ok(true) = self.analysis.should_eqwalize(file_id) {
                     Some(file_id)
                 } else {
                     None
diff --git a/crates/elp/src/to_proto.rs b/crates/elp/src/to_proto.rs
index 70d316d5c6..3e5b1fd1e1 100644
--- a/crates/elp/src/to_proto.rs
+++ b/crates/elp/src/to_proto.rs
@@ -10,6 +10,7 @@
 
 //! Conversion of rust-analyzer specific types to lsp_types equivalents.
 
+use std::mem;
 use std::sync::atomic::AtomicU32;
 use std::sync::atomic::Ordering;
 
@@ -47,6 +48,7 @@ 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;
@@ -121,9 +123,9 @@ 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
@@ -131,34 +133,131 @@ 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,
-    source_change: SourceChange,
+    mut source_change: SourceChange,
 ) -> Result<lsp_types::WorkspaceEdit> {
-    let mut edits: Vec<_> = vec![];
-    for (file_id, edit) in source_change.source_file_edits {
-        // 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(),
-        });
+    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);
+        }
     }
-    let document_changes = lsp_types::DocumentChanges::Edits(edits);
+
+    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);
+        }
+    }
+
+    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(),
+            },
+        ));
+    }
+
+    // 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 workspace_edit = lsp_types::WorkspaceEdit {
         changes: None,
-        document_changes: Some(document_changes),
+        document_changes: Some(lsp_types::DocumentChanges::Operations(document_changes)),
         change_annotations: None,
     };
     Ok(workspace_edit)
@@ -182,10 +281,6 @@ 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 e76fdb8bad..91f2b234d9 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_projects/buck_tests";
+        let path_str = "../../test/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, false)
+                .is_eqwalizer_enabled(file_id)
                 .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_projects/buck_tests";
+        let path_str = "../../test/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 60167593fd..e256ce2c62 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_projects/end_to_end"),
+            Utf8Path::new(env!("CARGO_WORKSPACE_DIR")).join("test/test_projects/end_to_end"),
         );
 
         // Sanity check
@@ -70,7 +70,7 @@ fn test_run_mock_lsp() {
                             }
                           ],
                           "textDocument": {
-                            "uri": "file:///[..]/test_projects/end_to_end/assist_examples/src/head_mismatch.erl",
+                            "uri": "file:///[..]/test/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_projects/end_to_end/assist_examples/src/head_mismatch.erl",
+                            "uri": "file:///[..]/test/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_projects/end_to_end/assist_examples/src/head_mismatch.erl",
+                            "uri": "file:///[..]/test/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_projects/end_to_end/assist_examples/src/head_mismatch.erl",
+                            "uri": "file:///[..]/test/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_projects/standard"),
+            Utf8Path::new(env!("CARGO_WORKSPACE_DIR")).join("test/test_projects/standard"),
         );
 
         // Sanity check
@@ -321,7 +321,7 @@ fn test_e2e_eqwalizer_module() {
                       "source": "eqWAlizer"
                     }
                   ],
-                  "uri": "file:///[..]/test_projects/standard/app_a/src/app_a.erl",
+                  "uri": "file:///[..]/test/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_projects/standard"));
+//         AbsPathBuf::assert(Path::new(env!("CARGO_WORKSPACE_DIR")).join("test/test_projects/standard"));
 
 //     // Sanity check
 //     assert!(std::fs::metadata(&workspace_root).is_ok());
diff --git a/crates/hir/src/fold.rs b/crates/hir/src/fold.rs
index 56ea3f56ae..59b12be6fd 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>,
+    pub in_macro: Option<(HirIdx, Option<InFile<DefineId>>)>,
     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>,
+    macro_stack: Vec<(HirIdx, Option<InFile<DefineId>>)>,
     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> {
+    fn in_macro(&self) -> Option<(HirIdx, Option<InFile<DefineId>>)> {
         self.macro_stack.first().copied()
     }
 
@@ -752,16 +752,19 @@ 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),
-                    });
+                    self.macro_stack.push((
+                        HirIdx {
+                            body_origin: self.body_origin,
+                            idx: AnyExprId::Expr(expr_id),
+                        },
+                        *macro_def,
+                    ));
                     let e = self.do_fold_expr(*expansion, acc);
                     self.macro_stack.pop();
                     e
@@ -950,16 +953,19 @@ 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),
-                    });
+                    self.macro_stack.push((
+                        HirIdx {
+                            body_origin: self.body_origin,
+                            idx: AnyExprId::Pat(pat_id),
+                        },
+                        *macro_def,
+                    ));
                     let e = self.do_fold_pat(*expansion, acc);
                     self.macro_stack.pop();
                     e
@@ -1165,16 +1171,19 @@ 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),
-                    });
+                    self.macro_stack.push((
+                        HirIdx {
+                            body_origin: self.body_origin,
+                            idx: AnyExprId::TypeExpr(type_expr_id),
+                        },
+                        *macro_def,
+                    ));
                     let e = self.do_fold_type_expr(*expansion, acc);
                     self.macro_stack.pop();
                     e
diff --git a/crates/hir/src/lib.rs b/crates/hir/src/lib.rs
index 1ec75fd25e..751a2f4907 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
+// @fb-only: pub use name::meta_only;
 pub use sema::AtomDef;
 pub use sema::CallDef;
 pub use sema::DefinitionOrReference;
@@ -232,6 +232,10 @@ 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 00ce2f89f1..f94f139d38 100644
--- a/crates/hir/src/name.rs
+++ b/crates/hir/src/name.rs
@@ -10,7 +10,7 @@
 
 //! See [`Name`].
 
-// @fb-only
+// @fb-only: pub mod meta_only;
 
 use std::borrow::Cow;
 use std::collections::HashSet;
diff --git a/crates/hir/src/sema.rs b/crates/hir/src/sema.rs
index 78a7db7c3c..68577d2a2e 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
+// @fb-only: pub mod meta_only;
 pub mod to_def;
 
 pub struct ModuleIter(Arc<ModuleIndex>);
@@ -1006,6 +1006,28 @@ 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 5918054fc5..01d17278a2 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
+// @fb-only: use crate::sema::meta_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
+                // @fb-only: meta_only::resolve_handle_call_target(sema, arity, file_id, &module_name, &fn_name);
             if let Some(r) = mo {
                 r
             } else {
@@ -885,12 +885,183 @@ fn add_dynamic_call_patterns(patterns: &mut FxHashMap<PatternKey, DynamicCallPat
     );
 }
 
-// Lazy static initialization for the patterns map
+/// 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! {
     static ref DYNAMIC_CALL_PATTERNS: FxHashMap<PatternKey, DynamicCallPattern> = {
         let mut patterns = FxHashMap::default();
         add_dynamic_call_patterns(&mut patterns);
-        // @fb-only
+        // @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);
+        }
         patterns
     };
 }
@@ -899,6 +1070,10 @@ 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 6cbdd3469c..d0ae18c158 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
+// @fb-only: use crate::meta_only;
 use crate::runnables::Runnable;
 use crate::runnables::runnables;
 
@@ -57,11 +57,11 @@ pub struct Link {
 }
 
 #[rustfmt::skip]
-// @fb-only
+// @fb-only: pub(crate) fn annotations(db: &RootDatabase, file_id: FileId) -> Vec<Annotation> {
 pub(crate) fn annotations(_db: &RootDatabase, _file_id: FileId) -> Vec<Annotation> { // @oss-only
-    // @fb-only
+    // @fb-only: let mut annotations = Vec::default();
     let annotations = Vec::default(); // @oss-only
-    // @fb-only
+    // @fb-only: meta_only::annotations(db, file_id, &mut annotations);
     annotations
 }
 
diff --git a/crates/ide/src/codemod_helpers.rs b/crates/ide/src/codemod_helpers.rs
index e06ceafd61..2ecd21e82c 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(expr_id) = ctx.in_macro {
-                        expr_id.idx
+                    let call_expr_id = if let Some((hir_idx, _macro_def)) = ctx.in_macro {
+                        hir_idx.idx
                     } else {
                         ctx.item_id
                     };
diff --git a/crates/ide/src/diagnostics.rs b/crates/ide/src/diagnostics.rs
index e3aa185b19..eb6bae611b 100644
--- a/crates/ide/src/diagnostics.rs
+++ b/crates/ide/src/diagnostics.rs
@@ -50,6 +50,7 @@ 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;
@@ -96,13 +97,13 @@ 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;
@@ -117,7 +118,7 @@ mod macro_precedence_suprise;
 mod map_find_to_syntax;
 mod map_insertion_to_syntax;
 mod meck;
-// @fb-only
+// @fb-only: mod meta_only;
 mod missing_compile_warn_missing_spec;
 mod missing_module;
 mod missing_separator;
@@ -131,6 +132,7 @@ 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;
@@ -549,12 +551,37 @@ 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())
@@ -865,6 +892,7 @@ pub(crate) trait GenericLinter: Linter {
     fn fixes(
         &self,
         _context: &Self::Context,
+        _range: TextRange,
         _sema: &Semantic,
         _file_id: FileId,
     ) -> Option<Vec<Assist>> {
@@ -898,7 +926,7 @@ 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, sema, file_id);
+                let fixes = self.fixes(&matched.context, matched.range, sema, file_id);
                 let tag = self.tag(&matched.context);
                 let mut d = Diagnostic::new(self.id(), message, matched.range)
                     .with_fixes(fixes)
@@ -1216,6 +1244,16 @@ 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,
@@ -1339,6 +1377,7 @@ 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>,
 }
@@ -1359,6 +1398,7 @@ 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,
         }
     }
@@ -1524,7 +1564,7 @@ pub fn native_diagnostics(
         config
             .lints_from_config
             .get_diagnostics(&mut res, &sema, file_id);
-        // @fb-only
+        // @fb-only: meta_only::diagnostics(&mut res, &sema, file_id, file_kind, config);
         syntax_diagnostics(&sema, &parse, &mut res, file_id);
         diagnostics_from_descriptors(
             &mut res,
@@ -1553,6 +1593,7 @@ 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
@@ -1561,6 +1602,7 @@ 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 {
@@ -1611,20 +1653,20 @@ 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) {
-            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);
-                    }
+            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);
                 }
-            } else {
-                (descriptor.checker)(res, sema, file_id, file_kind);
             }
         }
     });
@@ -1681,11 +1723,12 @@ const GENERIC_LINTERS: &[&dyn GenericDiagnostics] = &[
     &duplicate_module::LINTER,
     &no_nowarn_suppressions::LINTER,
     &macro_precedence_suprise::LINTER,
-    &edoc::LINTER,
+    &old_edoc_syntax::LINTER,
     &missing_module::LINTER,
     &unused_include::LINTER,
     &misspelled_attribute::LINTER,
     &boolean_precedence::LINTER,
+    &bound_variable::LINTER,
 ];
 
 /// Unified registry for all types of linters
@@ -1714,7 +1757,7 @@ pub(crate) fn linters() -> Vec<DiagnosticLinter> {
     );
 
     // Add meta-only linters
-    // @fb-only
+    // @fb-only: all_linters.extend(meta_only::linters());
 
     all_linters
 }
@@ -1731,11 +1774,12 @@ 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, is_generated, is_test)
+            && should_run(linter, config, &app_name, is_generated, is_test)
         {
             let severity = if let Some(lint_config) = config.lint_config.as_ref() {
                 lint_config
@@ -2297,11 +2341,14 @@ 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)
+                !d.should_be_suppressed(&metadata, config)
+                    && !config.disabled.contains(&d.code)
+                    && should_process_app(&app_name, config, &d.code)
             })
             .map(|(file_id, d)| {
                 (
@@ -2592,7 +2639,7 @@ 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
+            // @fb-only: meta_only::ct_diagnostics(&mut res, &sema, file_id, testcases);
         }
         CommonTestInfo::EvalError(_error) => {
             // The error currently does not contain anything useful, so we ignore it
@@ -3563,7 +3610,7 @@ 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_projects/diagnostics/app_a/src/syntax.erl
+        // spec, same code as in test/test_projects/diagnostics/app_a/src/syntax.erl
         check_diagnostics(
             r#"
              -module(main).
@@ -3992,6 +4039,7 @@ main(X) ->
                 include_tests: None,
                 include_generated: None,
                 experimental: None,
+                exclude_apps: None,
                 config: None,
             },
         );
@@ -4034,6 +4082,7 @@ main(X) ->
                 include_tests: Some(true),
                 include_generated: None,
                 experimental: None,
+                exclude_apps: None,
                 config: None,
             },
         );
@@ -4075,6 +4124,7 @@ main(X) ->
                 include_tests: None,
                 include_generated: Some(true),
                 experimental: None,
+                exclude_apps: None,
                 config: None,
             },
         );
@@ -4117,6 +4167,7 @@ main(X) ->
                 include_tests: None,
                 include_generated: None,
                 experimental: Some(true),
+                exclude_apps: None,
                 config: None,
             },
         );
@@ -4161,6 +4212,7 @@ main(X) ->
                 include_tests: None,
                 include_generated: None,
                 experimental: None,
+                exclude_apps: None,
                 config: None,
             },
         );
@@ -4191,6 +4243,47 @@ 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()
@@ -4238,6 +4331,7 @@ 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")]),
@@ -4270,6 +4364,7 @@ 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")]),
@@ -4287,6 +4382,7 @@ 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 1e4fe7c4cf..615b7801f9 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
+// @fb-only: use crate::diagnostics;
 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: true,
+        include_tests: false,
         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
+            // @fb-only: diagnostics::meta_only::application_env_bad_matches(),
         ]
         .into_iter()
         .flatten()
diff --git a/crates/ide/src/diagnostics/atoms_exhaustion.rs b/crates/ide/src/diagnostics/atoms_exhaustion.rs
index 4708e35b1f..56a43a50ca 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
+// @fb-only: use crate::diagnostics;
 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
+    // @fb-only: fn should_process_file_id(&self, sema: &Semantic, file_id: FileId) -> bool {
     fn should_process_file_id(&self, _sema: &Semantic, _file_id: FileId) -> bool { // @oss-only
-        // @fb-only
+        // @fb-only: diagnostics::meta_only::is_relevant_file(sema.db.upcast(), file_id)
         true // @oss-only
     }
 }
@@ -56,16 +56,16 @@ impl FunctionCallLinter for AtomsExhaustionLinter {
                 // FunctionMatch::mfa("erlang", "binary_to_term", 2),
             ]
             .into_iter()
-            // @fb-only
+            // @fb-only: .chain(diagnostics::meta_only::atoms_exhaustion_matches().into_iter())
             .collect::<Vec<_>>()
         ]
     }
 
     fn check_match(&self, context: &CheckCallCtx<'_, ()>) -> Option<Self::Context> {
         #[rustfmt::skip]
-        // @fb-only
-        // @fb-only
-            // @fb-only
+        // @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);
         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 21e374a4f5..f8f7851f8a 100644
--- a/crates/ide/src/diagnostics/boolean_precedence.rs
+++ b/crates/ide/src/diagnostics/boolean_precedence.rs
@@ -66,7 +66,6 @@ impl Linter for BooleanPrecedenceLinter {
 
 #[derive(Debug, Clone, PartialEq, Eq, Default)]
 pub struct Context {
-    range: TextRange,
     preceding_ws_range: TextRange,
     op: Op,
     lhs_complex: bool,
@@ -101,6 +100,7 @@ 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(context.range, context.preceding_ws_range),
+            context.op.range(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),
-            context.range,
+            range,
         ));
 
         // Add "add parens" fixes if applicable
         if context.lhs_complex {
-            fixes.push(parens_fix("LHS", file_id, context));
+            fixes.push(parens_fix("LHS", file_id, context, range));
         }
         if context.rhs_complex {
-            fixes.push(parens_fix("RHS", file_id, context));
+            fixes.push(parens_fix("RHS", file_id, context, range));
         }
 
         Some(fixes)
     }
 }
 
-fn parens_fix(side: &str, file_id: FileId, context: &Context) -> Assist {
+fn parens_fix(side: &str, file_id: FileId, context: &Context, range: TextRange) -> 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),
-        context.range,
+        range,
     )
 }
 
@@ -231,7 +231,6 @@ 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
new file mode 100644
index 0000000000..92f0edadfa
--- /dev/null
+++ b/crates/ide/src/diagnostics/bound_variable.rs
@@ -0,0 +1,178 @@
+/*
+ * 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 94c3d11364..1f0099781d 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
+// @fb-only: use crate::diagnostics::meta_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
+                // @fb-only: .chain(meta_only::debugging_function_matches().into_iter())
                 .collect::<Vec<_>>()
         ]
     }
diff --git a/crates/ide/src/diagnostics/deprecated_function.rs b/crates/ide/src/diagnostics/deprecated_function.rs
index 540edfcca3..b353d824d2 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
+// @fb-only: use crate::diagnostics;
 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
+                // @fb-only: diagnostics::meta_only::deprecated_function_matches(),
             ];
             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(expr_id) = ctx.in_macro {
-                            expr_id.idx
+                        let expr_id = if let Some((hir_idx, _macro_def)) = ctx.in_macro {
+                            hir_idx.idx
                         } else {
                             ctx.item_id
                         };
diff --git a/crates/ide/src/diagnostics/macro_precedence_suprise.rs b/crates/ide/src/diagnostics/macro_precedence_suprise.rs
index 838ddb3d9c..6cd5fe2429 100644
--- a/crates/ide/src/diagnostics/macro_precedence_suprise.rs
+++ b/crates/ide/src/diagnostics/macro_precedence_suprise.rs
@@ -35,9 +35,7 @@ use crate::diagnostics::Linter;
 use crate::fix;
 
 #[derive(Debug, Default, Clone, PartialEq)]
-pub(crate) struct MacroPrecedenceContext {
-    range: TextRange,
-}
+pub(crate) struct MacroPrecedenceContext;
 
 pub(crate) struct MacroPrecedenceSupriseLinter;
 
@@ -96,10 +94,9 @@ 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,
+                                        context: MacroPrecedenceContext,
                                     });
                                 }
                             }
@@ -113,16 +110,17 @@ impl GenericLinter for MacroPrecedenceSupriseLinter {
 
     fn fixes(
         &self,
-        context: &Self::Context,
+        _context: &Self::Context,
+        range: TextRange,
         _sema: &Semantic,
         file_id: FileId,
     ) -> Option<Vec<Assist>> {
-        let edit = add_parens_edit(&context.range);
+        let edit = add_parens_edit(&range);
         let fix = fix(
             "macro_precedence_add_parens",
             "Add parens to macro call",
             SourceChange::from_text_edit(file_id, edit),
-            context.range,
+            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 b1f24eb60f..dd0b677dce 100644
--- a/crates/ide/src/diagnostics/missing_compile_warn_missing_spec.rs
+++ b/crates/ide/src/diagnostics/missing_compile_warn_missing_spec.rs
@@ -75,7 +75,6 @@ impl Linter for MissingCompileWarnMissingSpec {
 pub struct Context {
     found: Found,
     compile_option_id: Option<CompileOptionId>,
-    target_range: TextRange,
 }
 
 impl GenericLinter for MissingCompileWarnMissingSpec {
@@ -94,7 +93,6 @@ impl GenericLinter for MissingCompileWarnMissingSpec {
                 context: Context {
                     found: Found::No,
                     compile_option_id: None,
-                    target_range: DIAGNOSTIC_WHOLE_FILE_RANGE,
                 },
             });
         }
@@ -149,7 +147,6 @@ impl GenericLinter for MissingCompileWarnMissingSpec {
                     context: Context {
                         found: what.0,
                         compile_option_id: what.1,
-                        target_range: range,
                     },
                 });
             }
@@ -160,6 +157,7 @@ impl GenericLinter for MissingCompileWarnMissingSpec {
     fn fixes(
         &self,
         context: &Self::Context,
+        range: TextRange,
         sema: &Semantic,
         file_id: FileId,
     ) -> Option<Vec<elp_ide_assists::Assist>> {
@@ -184,7 +182,7 @@ impl GenericLinter for MissingCompileWarnMissingSpec {
             "add_warn_missing_spec_all",
             "Add compile option 'warn_missing_spec_all'",
             edit,
-            context.target_range,
+            range,
         )])
     }
 }
diff --git a/crates/ide/src/diagnostics/misspelled_attribute.rs b/crates/ide/src/diagnostics/misspelled_attribute.rs
index f328f57b20..15ad1dd9d8 100644
--- a/crates/ide/src/diagnostics/misspelled_attribute.rs
+++ b/crates/ide/src/diagnostics/misspelled_attribute.rs
@@ -55,7 +55,6 @@ impl Linter for MisspelledAttributeLinter {
 
 #[derive(Debug, Clone, PartialEq, Eq, Default)]
 pub struct Context {
-    range: TextRange,
     attr_name: String,
     suggested_rename: String,
 }
@@ -88,7 +87,6 @@ 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(),
                         },
@@ -110,16 +108,17 @@ impl GenericLinter for MisspelledAttributeLinter {
     fn fixes(
         &self,
         context: &Self::Context,
+        range: TextRange,
         _sema: &Semantic,
         file_id: FileId,
     ) -> Option<Vec<Assist>> {
-        let edit = TextEdit::replace(context.range, context.suggested_rename.clone());
+        let edit = TextEdit::replace(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),
-            context.range,
+            range,
         )])
     }
 }
diff --git a/crates/ide/src/diagnostics/mutable_variable.rs b/crates/ide/src/diagnostics/mutable_variable.rs
index 52fe32eccf..6878c90d57 100644
--- a/crates/ide/src/diagnostics/mutable_variable.rs
+++ b/crates/ide/src/diagnostics/mutable_variable.rs
@@ -27,12 +27,8 @@
 //
 
 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;
@@ -60,21 +56,7 @@ fn mutable_variable_bug(
     sema: &Semantic,
     file_id: FileId,
 ) -> Option<()> {
-    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
-            });
-    });
+    let bound_vars_by_function = sema.bound_vars_by_function(file_id);
     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 d587d3f3c7..46f3d15e3e 100644
--- a/crates/ide/src/diagnostics/no_error_logger.rs
+++ b/crates/ide/src/diagnostics/no_error_logger.rs
@@ -29,6 +29,9 @@ 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/edoc.rs b/crates/ide/src/diagnostics/old_edoc_syntax.rs
similarity index 97%
rename from crates/ide/src/diagnostics/edoc.rs
rename to crates/ide/src/diagnostics/old_edoc_syntax.rs
index ead44d7331..da4c3f2430 100644
--- a/crates/ide/src/diagnostics/edoc.rs
+++ b/crates/ide/src/diagnostics/old_edoc_syntax.rs
@@ -8,7 +8,7 @@
  * above-listed licenses.
  */
 
-// Diagnostic: edoc
+// Diagnostic: old_edoc_syntax
 
 use elp_ide_assists::Assist;
 use elp_ide_assists::helpers;
@@ -31,11 +31,10 @@ use super::DiagnosticCode;
 use super::GenericLinter;
 use super::GenericLinterMatchContext;
 use super::Linter;
-use super::Severity;
 
-pub(crate) struct EdocLinter;
+pub(crate) struct OldEdocSyntaxLinter;
 
-impl Linter for EdocLinter {
+impl Linter for OldEdocSyntaxLinter {
     fn id(&self) -> DiagnosticCode {
         DiagnosticCode::OldEdocSyntax
     }
@@ -44,11 +43,8 @@ impl Linter for EdocLinter {
         "EDoc style comments are deprecated. Please use Markdown instead."
     }
 
-    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,
-        }
+    fn should_process_test_files(&self) -> bool {
+        false
     }
 }
 
@@ -56,10 +52,9 @@ impl Linter for EdocLinter {
 pub struct Context {
     header_ptr: Option<InFileAstPtr<ast::Form>>,
     doc_start: TextSize,
-    range: TextRange,
 }
 
-impl GenericLinter for EdocLinter {
+impl GenericLinter for OldEdocSyntaxLinter {
     type Context = Context;
 
     fn matches(
@@ -77,7 +72,6 @@ impl GenericLinter for EdocLinter {
                             context: Context {
                                 header_ptr: Some(*header_ptr),
                                 doc_start,
-                                range: doc.range,
                             },
                         });
                     }
@@ -88,7 +82,6 @@ impl GenericLinter for EdocLinter {
                             context: Context {
                                 header_ptr: Some(*header_ptr),
                                 doc_start,
-                                range: equiv.range,
                             },
                         });
                     }
@@ -99,7 +92,6 @@ impl GenericLinter for EdocLinter {
                             context: Context {
                                 header_ptr: Some(*header_ptr),
                                 doc_start,
-                                range: deprecated.range,
                             },
                         });
                     }
@@ -111,7 +103,6 @@ impl GenericLinter for EdocLinter {
                         context: Context {
                             header_ptr: Some(*header_ptr),
                             doc_start,
-                            range: hidden.range,
                         },
                     });
                 }
@@ -123,6 +114,7 @@ impl GenericLinter for EdocLinter {
     fn fixes(
         &self,
         context: &Self::Context,
+        range: TextRange,
         sema: &Semantic,
         file_id: FileId,
     ) -> Option<Vec<Assist>> {
@@ -134,12 +126,12 @@ impl GenericLinter for EdocLinter {
             file_id,
             header,
             context.doc_start,
-            context.range,
+            range,
         )])
     }
 }
 
-pub static LINTER: EdocLinter = EdocLinter;
+pub static LINTER: OldEdocSyntaxLinter = OldEdocSyntaxLinter;
 
 fn old_edoc_syntax_fix(
     sema: &Semantic,
@@ -302,22 +294,6 @@ 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/undefined_function.rs b/crates/ide/src/diagnostics/undefined_function.rs
index 189edf06f5..52fa2cfa3c 100644
--- a/crates/ide/src/diagnostics/undefined_function.rs
+++ b/crates/ide/src/diagnostics/undefined_function.rs
@@ -43,6 +43,13 @@ 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 eeb4caf7b1..1b2c80cfc9 100644
--- a/crates/ide/src/diagnostics/undocumented_module.rs
+++ b/crates/ide/src/diagnostics/undocumented_module.rs
@@ -48,9 +48,7 @@ impl Linter for UndocumentedModuleLinter {
 }
 
 #[derive(Debug, Default, Clone, PartialEq, Eq)]
-pub struct Context {
-    module_name_range: TextRange,
-}
+pub struct Context;
 
 impl GenericLinter for UndocumentedModuleLinter {
     type Context = Context;
@@ -71,16 +69,21 @@ 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, sema: &Semantic, file_id: FileId) -> Option<Vec<Assist>> {
+    fn fixes(
+        &self,
+        _context: &Context,
+        range: TextRange,
+        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");
@@ -89,7 +92,7 @@ impl GenericLinter for UndocumentedModuleLinter {
             "add_moduledoc_false",
             "Add `-moduledoc false.` attribute",
             source_change,
-            context.module_name_range,
+            range,
         );
         Some(vec![fix])
     }
diff --git a/crates/ide/src/diagnostics/unexported_function.rs b/crates/ide/src/diagnostics/unexported_function.rs
index 7aae73a9f1..2e1ebf7f54 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
+// @fb-only: use crate::diagnostics::meta_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
+    // @fb-only: fn should_process_file_id(&self, sema: &Semantic, file_id: FileId) -> bool {
         true // @oss-only
-        // @fb-only
+        // @fb-only: meta_only::should_check_for_unexported(sema, file_id)
     }
 }
 
diff --git a/crates/ide/src/diagnostics/unspecific_include.rs b/crates/ide/src/diagnostics/unspecific_include.rs
index f7405c798a..431740c085 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
+    // @fb-only: use elp_ide_db::meta_only::MetaOnlyDiagnosticCode;
     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
+            // @fb-only: .disable(DiagnosticCode::MetaOnly(MetaOnlyDiagnosticCode::MalformedInclude))
             .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 eed17b3c5c..eb26bcd923 100644
--- a/crates/ide/src/diagnostics/unused_include.rs
+++ b/crates/ide/src/diagnostics/unused_include.rs
@@ -137,6 +137,7 @@ 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 089371f85b..6ea8756b91 100644
--- a/crates/ide/src/diagnostics/unused_macro.rs
+++ b/crates/ide/src/diagnostics/unused_macro.rs
@@ -88,7 +88,13 @@ impl GenericLinter for UnusedMacroLinter {
         Some(DiagnosticTag::Unused)
     }
 
-    fn fixes(&self, context: &Context, _sema: &Semantic, file_id: FileId) -> Option<Vec<Assist>> {
+    fn fixes(
+        &self,
+        context: &Context,
+        _range: TextRange,
+        _sema: &Semantic,
+        file_id: FileId,
+    ) -> Option<Vec<Assist>> {
         Some(vec![delete_unused_macro(
             file_id,
             context.delete_range,
diff --git a/crates/ide/src/doc_links.rs b/crates/ide/src/doc_links.rs
index d13befe8bb..6a85ab3dc3 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
+// @fb-only: use crate::meta_only::exdoc_links;
 
-// @fb-only
+// @fb-only: mod meta_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
+            // @fb-only: exdoc_links::links(&mut doc_links, &sema, &def);
         });
     }
-    // @fb-only
+    // @fb-only: meta_only::links(&mut doc_links, node, position);
     Some(doc_links)
 }
 
diff --git a/crates/ide/src/lib.rs b/crates/ide/src/lib.rs
index dcaff6de70..ad5c1bb680 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
+// @fb-only: pub mod meta_only;
 
 pub use annotations::Annotation;
 pub use annotations::AnnotationKind;
@@ -251,9 +251,9 @@ impl Analysis {
         })
     }
 
-    pub fn should_eqwalize(&self, file_id: FileId, include_tests: bool) -> Cancellable<bool> {
+    pub fn should_eqwalize(&self, file_id: FileId) -> 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, include_tests)?)
+        Ok(is_in_app && self.is_eqwalizer_enabled(file_id)?)
     }
 
     /// 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, include_tests: bool) -> Cancellable<bool> {
-        self.with_db(|db| db.is_eqwalizer_enabled(file_id, include_tests))
+    pub fn is_eqwalizer_enabled(&self, file_id: FileId) -> Cancellable<bool> {
+        self.with_db(|db| db.is_eqwalizer_enabled(file_id))
     }
 
     /// ETF for the module's abstract forms
diff --git a/crates/ide/src/rename.rs b/crates/ide/src/rename.rs
index 0cedbe1d90..ee5bfb7219 100644
--- a/crates/ide/src/rename.rs
+++ b/crates/ide/src/rename.rs
@@ -194,35 +194,53 @@ 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 (analysis, position, _) = fixture::position(fixture_before);
+        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 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);
                     }
@@ -232,6 +250,82 @@ 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:") {
@@ -247,6 +341,16 @@ 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."#);
@@ -1135,6 +1239,326 @@ 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/tests.rs b/crates/ide/src/tests.rs
index f1a9065e01..55e9494e48 100644
--- a/crates/ide/src/tests.rs
+++ b/crates/ide/src/tests.rs
@@ -378,6 +378,7 @@ 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)
 }
diff --git a/crates/ide_completion/src/lib.rs b/crates/ide_completion/src/lib.rs
index 71b4ff02c0..f41aecdd67 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
+// @fb-only: mod meta_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
+                // @fb-only: || meta_only::add_completions(&mut acc, ctx)
                 || vars::add_completions(&mut acc, ctx)
                 || maps::add_completions(&mut acc, ctx)
                 || records::add_completions(&mut acc, ctx);
diff --git a/crates/ide_db/src/diagnostic_code.rs b/crates/ide_db/src/diagnostic_code.rs
index 957caecb09..ec1e1d76cf 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
+// @fb-only: use crate::meta_only::MetaOnlyDiagnosticCode;
 
-// @fb-only
+// @fb-only: pub const BASE_URL: &str = crate::meta_only::BASE_URL;
 pub const BASE_URL: &str = "https://whatsapp.github.io/erlang-language-platform/docs"; // @oss-only
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash, EnumIter)]
@@ -93,6 +93,7 @@ pub enum DiagnosticCode {
     ListsReverseAppend,
     HirUnresolvedMacro,
     HirUnresolvedInclude,
+    BoundVarInLhs,
 
     // Wrapper for erlang service diagnostic codes
     ErlangService(String),
@@ -100,7 +101,7 @@ pub enum DiagnosticCode {
     Eqwalizer(String),
     // Used for ad-hoc diagnostics via lints/codemods
     AdHoc(String),
-    // @fb-only
+    // @fb-only: MetaOnly(MetaOnlyDiagnosticCode),
 }
 
 // These namespaces map the error codes returned by the Erlang Service.
@@ -116,7 +117,7 @@ pub enum Namespace {
     Parser,
     EDoc,
     WhatsApp,
-    // @fb-only
+    // @fb-only: MetaOnly,
 }
 
 impl fmt::Display for Namespace {
@@ -131,7 +132,7 @@ impl fmt::Display for Namespace {
             Namespace::Parser => "p",
             Namespace::EDoc => "o",
             Namespace::WhatsApp => "w",
-            // @fb-only
+            // @fb-only: Namespace::MetaOnly => "meta_only",
         };
         write!(f, "{namespace}")
     }
@@ -164,7 +165,7 @@ impl Namespace {
     pub fn supports_doc_path(&self) -> bool {
         match self {
             Namespace::WhatsApp => true,
-            // @fb-only
+            // @fb-only: Namespace::MetaOnly => true,
             _ => false,
         }
     }
@@ -256,10 +257,11 @@ 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
+            // @fb-only: DiagnosticCode::MetaOnly(c) => c.as_code(),
         }
     }
 
@@ -271,6 +273,7 @@ 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(),
@@ -360,7 +363,7 @@ impl DiagnosticCode {
             DiagnosticCode::ErlangService(c) => c.to_string(),
             DiagnosticCode::Eqwalizer(c) => c.to_string(),
             DiagnosticCode::AdHoc(c) => format!("ad-hoc: {c}"),
-            // @fb-only
+            // @fb-only: DiagnosticCode::MetaOnly(c) => c.as_label(),
         }
     }
 
@@ -371,7 +374,7 @@ impl DiagnosticCode {
     pub fn maybe_from_string(s: &str) -> Option<DiagnosticCode> {
         DIAGNOSTIC_CODE_LOOKUPS
             .get(s).cloned()
-            // @fb-only
+            // @fb-only: .or_else(|| MetaOnlyDiagnosticCode::from_str(s).ok().map(DiagnosticCode::MetaOnly))
             .or_else( ||
                 // Look for ErlangService and AdHoc
                 if let Some(code) = Self::is_adhoc(s) {
@@ -388,7 +391,7 @@ impl DiagnosticCode {
         match self {
             DiagnosticCode::DefaultCodeForEnumIter => None,
             DiagnosticCode::AdHoc(_) => None,
-            // @fb-only
+            // @fb-only: DiagnosticCode::MetaOnly(_) => Some(Namespace::MetaOnly),
             DiagnosticCode::ErlangService(code) => Namespace::from_str(code).ok(),
             _ => Namespace::from_str(&self.as_code()).ok(),
         }
@@ -397,7 +400,7 @@ impl DiagnosticCode {
     pub fn supports_doc_path(&self) -> bool {
         match self {
             DiagnosticCode::DefaultCodeForEnumIter => false,
-            // @fb-only
+            // @fb-only: DiagnosticCode::MetaOnly(MetaOnlyDiagnosticCode::DefaultCodeForEnumIter) => false,
             _ => true,
         }
     }
@@ -486,6 +489,7 @@ impl DiagnosticCode {
             DiagnosticCode::ModuleMismatch => false,
             DiagnosticCode::UnusedInclude => false,
             DiagnosticCode::BoundVarInPattern => false,
+            DiagnosticCode::BoundVarInLhs => false,
             DiagnosticCode::UnusedMacro => false,
             DiagnosticCode::UnusedRecordField => false,
             DiagnosticCode::MutableVarBug => false,
@@ -541,7 +545,7 @@ impl DiagnosticCode {
             DiagnosticCode::ErlangService(_) => false,
             DiagnosticCode::Eqwalizer(_) => false,
             DiagnosticCode::AdHoc(_) => false,
-            // @fb-only
+            // @fb-only: DiagnosticCode::MetaOnly(code) => code.allows_fixme_comment(),
         }
     }
 
diff --git a/crates/ide_db/src/eqwalizer.rs b/crates/ide_db/src/eqwalizer.rs
index 4deed79778..fca577bb21 100644
--- a/crates/ide_db/src/eqwalizer.rs
+++ b/crates/ide_db/src/eqwalizer.rs
@@ -12,7 +12,6 @@ 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;
@@ -89,7 +88,7 @@ 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, include_tests: bool) -> bool;
+    fn is_eqwalizer_enabled(&self, file_id: FileId) -> bool;
 }
 
 pub fn eqwalizer_diagnostics_by_project(
@@ -114,7 +113,7 @@ fn type_at_position(
     db: &dyn EqwalizerDatabase,
     range: FileRange,
 ) -> Option<Arc<(eqwalizer::types::Type, FileRange)>> {
-    if !db.is_eqwalizer_enabled(range.file_id, false) {
+    if !db.is_eqwalizer_enabled(range.file_id) {
         return None;
     }
     let project_id = db.file_app_data(range.file_id)?.project_id;
@@ -149,7 +148,7 @@ 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, false) {
+    if !db.is_eqwalizer_enabled(file_id) {
         return None;
     }
     let project_id = db.file_app_data(file_id)?.project_id;
@@ -162,7 +161,7 @@ fn types_for_file(db: &dyn EqwalizerDatabase, file_id: FileId) -> Option<Arc<Vec
     None
 }
 
-fn is_eqwalizer_enabled(db: &dyn EqwalizerDatabase, file_id: FileId, include_tests: bool) -> bool {
+fn is_eqwalizer_enabled(db: &dyn EqwalizerDatabase, file_id: FileId) -> bool {
     if !otp_supported_by_eqwalizer() {
         return false;
     }
@@ -178,11 +177,8 @@ fn is_eqwalizer_enabled(db: &dyn EqwalizerDatabase, file_id: FileId, include_tes
     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 && (is_src || is_test_opted_in)) || db.has_eqwalizer_module_marker(file_id);
+    let opt_in = global_opt_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 c92be86f5f..038b41f0be 100644
--- a/crates/ide_db/src/helpers.rs
+++ b/crates/ide_db/src/helpers.rs
@@ -43,11 +43,22 @@ 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> {
-    if let Some(call) = ast::Call::cast(syntax.parent()?) {
-        Some(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)
     } else {
-        ast::Call::cast(syntax.parent()?.parent()?)
+        ast::ExternalFun::cast(syntax.parent()?.parent()?)
     }
 }
 
diff --git a/crates/ide_db/src/lib.rs b/crates/ide_db/src/lib.rs
index 9b64d09b31..aecfd86473 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
+// @fb-only: pub mod meta_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, false);
+        let eqwalizer_enabled = self.is_eqwalizer_enabled(file_id);
         if !eqwalizer_enabled {
             return Some(vec![]);
         }
diff --git a/crates/ide_db/src/rename.rs b/crates/ide_db/src/rename.rs
index 889569ca4e..bd5a49f8cf 100644
--- a/crates/ide_db/src/rename.rs
+++ b/crates/ide_db/src/rename.rs
@@ -15,8 +15,10 @@
 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;
@@ -25,9 +27,12 @@ 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>;
 
@@ -106,6 +111,18 @@ 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,
@@ -122,7 +139,10 @@ impl SymbolDefinition {
     ) -> RenameResult<SourceChange> {
         match self.clone() {
             SymbolDefinition::Module(_) => {
-                rename_error!("Cannot rename 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)
             }
             SymbolDefinition::Function(fun) => {
                 if safety_check == SafetyChecks::Yes && !is_valid_function_name(new_name) {
@@ -375,6 +395,7 @@ 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
             _ => {
@@ -382,6 +403,184 @@ 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 20b4f050b4..1e66598359 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)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 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 e4afbd8742..60b62279fe 100644
--- a/crates/ide_db/src/source_change.rs
+++ b/crates/ide_db/src/source_change.rs
@@ -30,9 +30,36 @@ 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,
 }
@@ -46,6 +73,7 @@ impl SourceChange {
     ) -> Self {
         SourceChange {
             source_file_edits,
+            new_file_edits: FxHashMap::default(),
             file_system_edits,
             is_snippet: false,
         }
@@ -74,6 +102,22 @@ 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);
     }
@@ -85,12 +129,15 @@ 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.source_file_edits.is_empty()
+            && self.file_system_edits.is_empty()
+            && self.new_file_edits.is_empty()
     }
 
     pub fn text_range(&self, file_id: FileId) -> Option<TextRange> {
@@ -116,10 +163,18 @@ 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,
         }
@@ -265,6 +320,7 @@ 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/project_model/src/buck.rs b/crates/project_model/src/buck.rs
index 013f3cbc87..45c6b7f732 100644
--- a/crates/project_model/src/buck.rs
+++ b/crates/project_model/src/buck.rs
@@ -58,6 +58,7 @@ lazy_static! {
 }
 
 const ERL_EXT: &str = "erl";
+const BUCK_ISOLATION_DIR: &str = "lsp";
 
 #[derive(
     Debug,
@@ -108,7 +109,7 @@ impl BuckConfig {
         cmd.env_remove("RUST_BACKTRACE")
             .env_remove("RUST_LIB_BACKTRACE");
         cmd.arg("--isolation-dir");
-        cmd.arg("lsp");
+        cmd.arg(BUCK_ISOLATION_DIR);
         cmd.current_dir(self.buck_root());
         CommandProxy::new(guard, cmd)
     }
@@ -1362,36 +1363,56 @@ 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 output = buck_config
-        .buck_command()
+    let mut command = buck_config.buck_command();
+    command
         .arg("audit")
         .arg("cell")
         .arg("prelude")
-        .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)?;
+        .arg("--json");
+    let raw_output = check_buck_output_success(command)?;
 
-    lazy_static! {
-        static ref RE: Regex = Regex::new(r"^prelude: ([^\s]+)").unwrap();
+    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)
     }
-    let string = RE
-        .captures_iter(&raw_output)
-        .next()
-        .map(|c| c[1].to_string())
-        .unwrap();
-    Ok(string)
+}
+
+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())
 }
 
 #[cfg(test)]
@@ -1622,72 +1643,66 @@ 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) {
-        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 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]/");
+
+        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 BUCK_TESTS_ENABLED {
+        if cfg!(feature = "buck") {
             check_buck_bxl_query(
                 false,
                 expect![[r#"
                 {
-                  "fbcode//whatsapp/elp/test_projects/buck_tests_2/auto_gen/auto_gen_a:auto_gen_a": {
+                  "root//buck_tests_2/auto_gen/auto_gen_a:auto_gen_a": {
                     "name": "auto_gen_a",
                     "app_name": null,
                     "suite": null,
                     "srcs": [
-                      "/[..]/test_projects/buck_tests_2/auto_gen/auto_gen_a/src/auto_gen_a.erl"
+                      "/[..]/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/src/auto_gen_a.erl"
                     ],
                     "includes": [
-                      "/[..]/test_projects/buck_tests_2/auto_gen/auto_gen_a/include"
+                      "/[..]/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/include"
                     ],
                     "labels": [
                       "user_application"
@@ -1697,7 +1712,7 @@ mod tests {
                     "included_apps": [],
                     "origin": "app"
                   },
-                  "fbcode//whatsapp/elp/test_projects/buck_tests_2/auto_gen/auto_gen_a:generated_srcs": {
+                  "root//buck_tests_2/auto_gen/auto_gen_a:generated_srcs": {
                     "name": "generated_srcs",
                     "app_name": null,
                     "suite": null,
@@ -1840,23 +1855,23 @@ mod tests {
     #[test]
     #[ignore]
     fn build_info_buck_bxl_generated_query() {
-        if BUCK_TESTS_ENABLED {
+        if cfg!(feature = "buck") {
             // Note that there is now a value for `srcs` in the
-            // "fbcode//whatsapp/elp/test_projects/buck_tests_2/auto_gen/auto_gen_a:generated_srcs"
+            // "root//buck_tests_2/auto_gen/auto_gen_a:generated_srcs"
             // target
             check_buck_bxl_query(
                 true,
                 expect![[r#"
                     {
-                      "fbcode//whatsapp/elp/test_projects/buck_tests_2/auto_gen/auto_gen_a:auto_gen_a": {
+                      "root//buck_tests_2/auto_gen/auto_gen_a:auto_gen_a": {
                         "name": "auto_gen_a",
                         "app_name": null,
                         "suite": null,
                         "srcs": [
-                          "/[..]/test_projects/buck_tests_2/auto_gen/auto_gen_a/src/auto_gen_a.erl"
+                          "/[..]/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/src/auto_gen_a.erl"
                         ],
                         "includes": [
-                          "/[..]/test_projects/buck_tests_2/auto_gen/auto_gen_a/include"
+                          "/[..]/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/include"
                         ],
                         "labels": [
                           "user_application"
@@ -1866,12 +1881,12 @@ mod tests {
                         "included_apps": [],
                         "origin": "app"
                       },
-                      "fbcode//whatsapp/elp/test_projects/buck_tests_2/auto_gen/auto_gen_a:generated_srcs": {
+                      "root//buck_tests_2/auto_gen/auto_gen_a:generated_srcs": {
                         "name": "generated_srcs",
                         "app_name": null,
                         "suite": null,
                         "srcs": [
-                          "/[..]/test_projects/buck_tests_2/auto_gen/auto_gen_a/out/pretend_generated.erl"
+                          "/[..]/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/out/pretend_generated.erl"
                         ],
                         "includes": [],
                         "labels": [
diff --git a/eqwalizer b/eqwalizer
index a835ce03b0..0f514eb389 160000
--- a/eqwalizer
+++ b/eqwalizer
@@ -1 +1 @@
-Subproject commit a835ce03b0308a9869af964e35a24466b49cda51
+Subproject commit 0f514eb3893fa7070835c83ecb49fbea31b0426d
diff --git a/erlang_service/src/elp_lint.erl b/erlang_service/src/elp_lint.erl
index 609e8c0712..31d2c70248 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
-% @fb-only
+% @fb-only: is_format_function(wa_log, send_if) -> true;
+% @fb-only: is_format_function(wa_string, format) -> true;
 is_format_function(M, F) when is_atom(M), is_atom(F) -> false.
 
 %% check_format_1([Arg]) -> ok | {warn,Level,Format,[Arg]}.
 
-% @fb-only
-% @fb-only
+% @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];
 format_args(_M, _F, As) ->
     As.
 
diff --git a/test/test_projects/.buckconfig b/test/test_projects/.buckconfig
new file mode 100644
index 0000000000..f14e564a7d
--- /dev/null
+++ b/test/test_projects/.buckconfig
@@ -0,0 +1,24 @@
+[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_projects/eqwalizer_tests/fault_tolerance/.eqwalizer b/test/test_projects/.buckroot
similarity index 100%
rename from test_projects/eqwalizer_tests/fault_tolerance/.eqwalizer
rename to test/test_projects/.buckroot
diff --git a/test_projects/.gitignore b/test/test_projects/.gitignore
similarity index 85%
rename from test_projects/.gitignore
rename to test/test_projects/.gitignore
index b34578734c..2672c17cc4 100644
--- a/test_projects/.gitignore
+++ b/test/test_projects/.gitignore
@@ -3,3 +3,4 @@
 *wa.build_info
 *_build/
 *rebar.lock
+buck-out/
diff --git a/test_projects/README.md b/test/test_projects/README.md
similarity index 100%
rename from test_projects/README.md
rename to test/test_projects/README.md
diff --git a/test/test_projects/buck_bad_config/.elp.toml b/test/test_projects/buck_bad_config/.elp.toml
new file mode 100644
index 0000000000..963072284c
--- /dev/null
+++ b/test/test_projects/buck_bad_config/.elp.toml
@@ -0,0 +1,8 @@
+[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
new file mode 100644
index 0000000000..498c769dac
--- /dev/null
+++ b/test/test_projects/buck_bad_config/BUCK
@@ -0,0 +1,14 @@
+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_projects/buck_bad_config/src/bad_app.erl b/test/test_projects/buck_bad_config/src/bad_app.erl
similarity index 100%
rename from test_projects/buck_bad_config/src/bad_app.erl
rename to test/test_projects/buck_bad_config/src/bad_app.erl
diff --git a/test/test_projects/buck_tests/.elp.toml b/test/test_projects/buck_tests/.elp.toml
new file mode 100644
index 0000000000..b38d6f043f
--- /dev/null
+++ b/test/test_projects/buck_tests/.elp.toml
@@ -0,0 +1,9 @@
+[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_projects/buck_tests/TARGETS.v2_ b/test/test_projects/buck_tests/TARGETS.v2_
similarity index 100%
rename from test_projects/buck_tests/TARGETS.v2_
rename to test/test_projects/buck_tests/TARGETS.v2_
diff --git a/test_projects/buck_tests/test_elp/TARGETS.v2_ b/test/test_projects/buck_tests/test_elp/TARGETS.v2_
similarity index 77%
rename from test_projects/buck_tests/test_elp/TARGETS.v2_
rename to test/test_projects/buck_tests/test_elp/TARGETS.v2_
index 83089813da..7e5bd95db5 100644
--- a/test_projects/buck_tests/test_elp/TARGETS.v2_
+++ b/test/test_projects/buck_tests/test_elp/TARGETS.v2_
@@ -7,11 +7,11 @@ erlang_application(
     ]),
     app_src = "src/test_elp.app.src",
     applications = [
-        "//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",
+        "//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",
     ],
     includes = glob(["include/*.hrl"]),
     version = "1.0.0",
diff --git a/test_projects/buck_tests/test_elp/include/test_elp.hrl b/test/test_projects/buck_tests/test_elp/include/test_elp.hrl
similarity index 100%
rename from test_projects/buck_tests/test_elp/include/test_elp.hrl
rename to test/test_projects/buck_tests/test_elp/include/test_elp.hrl
diff --git a/test_projects/buck_tests/test_elp/src/test_elp.app.src b/test/test_projects/buck_tests/test_elp/src/test_elp.app.src
similarity index 100%
rename from test_projects/buck_tests/test_elp/src/test_elp.app.src
rename to test/test_projects/buck_tests/test_elp/src/test_elp.app.src
diff --git a/test_projects/buck_tests/test_elp/src/test_elp.erl b/test/test_projects/buck_tests/test_elp/src/test_elp.erl
similarity index 100%
rename from test_projects/buck_tests/test_elp/src/test_elp.erl
rename to test/test_projects/buck_tests/test_elp/src/test_elp.erl
diff --git a/test_projects/buck_tests/test_elp/test/test_elp_SUITE.erl b/test/test_projects/buck_tests/test_elp/test/test_elp_SUITE.erl
similarity index 100%
rename from test_projects/buck_tests/test_elp/test/test_elp_SUITE.erl
rename to test/test_projects/buck_tests/test_elp/test/test_elp_SUITE.erl
diff --git a/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/handle_update_test1.json b/test/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/handle_update_test1.json
similarity index 100%
rename from test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/handle_update_test1.json
rename to test/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/handle_update_test1.json
diff --git a/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/handle_update_test2.json b/test/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/handle_update_test2.json
similarity index 100%
rename from test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/handle_update_test2.json
rename to test/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/handle_update_test2.json
diff --git a/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/untracked_header.hrl b/test/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/untracked_header.hrl
similarity index 100%
rename from test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/untracked_header.hrl
rename to test/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/untracked_header.hrl
diff --git a/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/untracked_module.erl b/test/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/untracked_module.erl
similarity index 100%
rename from test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/untracked_module.erl
rename to test/test_projects/buck_tests/test_elp/test/test_elp_SUITE_data/untracked_module.erl
diff --git a/test_projects/buck_tests/test_elp/test/test_elp_test_utils.erl b/test/test_projects/buck_tests/test_elp/test/test_elp_test_utils.erl
similarity index 100%
rename from test_projects/buck_tests/test_elp/test/test_elp_test_utils.erl
rename to test/test_projects/buck_tests/test_elp/test/test_elp_test_utils.erl
diff --git a/test_projects/buck_tests/test_elp/test/test_elp_test_utils.hrl b/test/test_projects/buck_tests/test_elp/test/test_elp_test_utils.hrl
similarity index 100%
rename from test_projects/buck_tests/test_elp/test/test_elp_test_utils.hrl
rename to test/test_projects/buck_tests/test_elp/test/test_elp_test_utils.hrl
diff --git a/test_projects/buck_tests/test_elp_direct_dep/TARGETS.v2_ b/test/test_projects/buck_tests/test_elp_direct_dep/TARGETS.v2_
similarity index 62%
rename from test_projects/buck_tests/test_elp_direct_dep/TARGETS.v2_
rename to test/test_projects/buck_tests/test_elp_direct_dep/TARGETS.v2_
index d0fea8149b..a752b99087 100644
--- a/test_projects/buck_tests/test_elp_direct_dep/TARGETS.v2_
+++ b/test/test_projects/buck_tests/test_elp_direct_dep/TARGETS.v2_
@@ -5,10 +5,10 @@ erlang_application(
         "src/*.hrl",
     ]),
     applications = [
-        "//whatsapp/elp/test_projects/buck_tests/test_elp_transitive_dep:test_elp_transitive_dep",
+        "//buck_tests/test_elp_transitive_dep:test_elp_transitive_dep",
     ],
     extra_includes = [
-        "//whatsapp/elp/test_projects/buck_tests/test_elp:test_elp",
+        "//buck_tests/test_elp:test_elp",
     ],
     includes = glob(["include/*.hrl"]),
     version = "1.0.0",
diff --git a/test_projects/buck_tests/test_elp_direct_dep/include/test_elp_direct_dep.hrl b/test/test_projects/buck_tests/test_elp_direct_dep/include/test_elp_direct_dep.hrl
similarity index 100%
rename from test_projects/buck_tests/test_elp_direct_dep/include/test_elp_direct_dep.hrl
rename to test/test_projects/buck_tests/test_elp_direct_dep/include/test_elp_direct_dep.hrl
diff --git a/test_projects/buck_tests/test_elp_direct_dep/src/test_elp_direct_dep.erl b/test/test_projects/buck_tests/test_elp_direct_dep/src/test_elp_direct_dep.erl
similarity index 100%
rename from test_projects/buck_tests/test_elp_direct_dep/src/test_elp_direct_dep.erl
rename to test/test_projects/buck_tests/test_elp_direct_dep/src/test_elp_direct_dep.erl
diff --git a/test_projects/buck_tests/test_elp_direct_dep/src/test_elp_direct_dep_private.hrl b/test/test_projects/buck_tests/test_elp_direct_dep/src/test_elp_direct_dep_private.hrl
similarity index 100%
rename from test_projects/buck_tests/test_elp_direct_dep/src/test_elp_direct_dep_private.hrl
rename to test/test_projects/buck_tests/test_elp_direct_dep/src/test_elp_direct_dep_private.hrl
diff --git a/test_projects/buck_tests/test_elp_flat_inside_target/TARGETS.v2_ b/test/test_projects/buck_tests/test_elp_flat_inside_target/TARGETS.v2_
similarity index 100%
rename from test_projects/buck_tests/test_elp_flat_inside_target/TARGETS.v2_
rename to test/test_projects/buck_tests/test_elp_flat_inside_target/TARGETS.v2_
diff --git a/test_projects/buck_tests/test_elp_flat_inside_target/test_elp_flat_inside_target.erl b/test/test_projects/buck_tests/test_elp_flat_inside_target/test_elp_flat_inside_target.erl
similarity index 100%
rename from test_projects/buck_tests/test_elp_flat_inside_target/test_elp_flat_inside_target.erl
rename to test/test_projects/buck_tests/test_elp_flat_inside_target/test_elp_flat_inside_target.erl
diff --git a/test_projects/buck_tests/test_elp_flat_inside_target/test_elp_flat_inside_target.hrl b/test/test_projects/buck_tests/test_elp_flat_inside_target/test_elp_flat_inside_target.hrl
similarity index 100%
rename from test_projects/buck_tests/test_elp_flat_inside_target/test_elp_flat_inside_target.hrl
rename to test/test_projects/buck_tests/test_elp_flat_inside_target/test_elp_flat_inside_target.hrl
diff --git a/test_projects/buck_tests/test_elp_flat_outside_target/test_elp_flat_outside_target.erl b/test/test_projects/buck_tests/test_elp_flat_outside_target/test_elp_flat_outside_target.erl
similarity index 100%
rename from test_projects/buck_tests/test_elp_flat_outside_target/test_elp_flat_outside_target.erl
rename to test/test_projects/buck_tests/test_elp_flat_outside_target/test_elp_flat_outside_target.erl
diff --git a/test_projects/buck_tests/test_elp_flat_outside_target/test_elp_flat_outside_target.hrl b/test/test_projects/buck_tests/test_elp_flat_outside_target/test_elp_flat_outside_target.hrl
similarity index 100%
rename from test_projects/buck_tests/test_elp_flat_outside_target/test_elp_flat_outside_target.hrl
rename to test/test_projects/buck_tests/test_elp_flat_outside_target/test_elp_flat_outside_target.hrl
diff --git a/test_projects/buck_tests/test_elp_ignored/test_elp_ignored.erl b/test/test_projects/buck_tests/test_elp_ignored/test_elp_ignored.erl
similarity index 100%
rename from test_projects/buck_tests/test_elp_ignored/test_elp_ignored.erl
rename to test/test_projects/buck_tests/test_elp_ignored/test_elp_ignored.erl
diff --git a/test_projects/buck_tests/test_elp_no_private_headers/include/test_elp_no_private_headers.hrl b/test/test_projects/buck_tests/test_elp_no_private_headers/include/test_elp_no_private_headers.hrl
similarity index 100%
rename from test_projects/buck_tests/test_elp_no_private_headers/include/test_elp_no_private_headers.hrl
rename to test/test_projects/buck_tests/test_elp_no_private_headers/include/test_elp_no_private_headers.hrl
diff --git a/test_projects/buck_tests/test_elp_no_private_headers/src/test_elp_no_private_headers.erl b/test/test_projects/buck_tests/test_elp_no_private_headers/src/test_elp_no_private_headers.erl
similarity index 100%
rename from test_projects/buck_tests/test_elp_no_private_headers/src/test_elp_no_private_headers.erl
rename to test/test_projects/buck_tests/test_elp_no_private_headers/src/test_elp_no_private_headers.erl
diff --git a/test_projects/buck_tests/test_elp_no_public_headers/src/test_elp_no_headers.erl b/test/test_projects/buck_tests/test_elp_no_public_headers/src/test_elp_no_headers.erl
similarity index 100%
rename from test_projects/buck_tests/test_elp_no_public_headers/src/test_elp_no_headers.erl
rename to test/test_projects/buck_tests/test_elp_no_public_headers/src/test_elp_no_headers.erl
diff --git a/test_projects/buck_tests/test_elp_transitive_dep/TARGETS.v2_ b/test/test_projects/buck_tests/test_elp_transitive_dep/TARGETS.v2_
similarity index 100%
rename from test_projects/buck_tests/test_elp_transitive_dep/TARGETS.v2_
rename to test/test_projects/buck_tests/test_elp_transitive_dep/TARGETS.v2_
diff --git a/test_projects/buck_tests/test_elp_transitive_dep/include/test_elp_transitive_dep.hrl b/test/test_projects/buck_tests/test_elp_transitive_dep/include/test_elp_transitive_dep.hrl
similarity index 100%
rename from test_projects/buck_tests/test_elp_transitive_dep/include/test_elp_transitive_dep.hrl
rename to test/test_projects/buck_tests/test_elp_transitive_dep/include/test_elp_transitive_dep.hrl
diff --git a/test_projects/buck_tests/test_elp_transitive_dep/src/test_elp_transitive_dep.erl b/test/test_projects/buck_tests/test_elp_transitive_dep/src/test_elp_transitive_dep.erl
similarity index 100%
rename from test_projects/buck_tests/test_elp_transitive_dep/src/test_elp_transitive_dep.erl
rename to test/test_projects/buck_tests/test_elp_transitive_dep/src/test_elp_transitive_dep.erl
diff --git a/test_projects/buck_tests/test_elp_transitive_dep/src/test_elp_transitive_dep_private.hrl b/test/test_projects/buck_tests/test_elp_transitive_dep/src/test_elp_transitive_dep_private.hrl
similarity index 100%
rename from test_projects/buck_tests/test_elp_transitive_dep/src/test_elp_transitive_dep_private.hrl
rename to test/test_projects/buck_tests/test_elp_transitive_dep/src/test_elp_transitive_dep_private.hrl
diff --git a/test/test_projects/buck_tests_2/.elp.toml b/test/test_projects/buck_tests_2/.elp.toml
new file mode 100644
index 0000000000..e71eb6a819
--- /dev/null
+++ b/test/test_projects/buck_tests_2/.elp.toml
@@ -0,0 +1,12 @@
+[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
new file mode 100644
index 0000000000..b01fdb868c
--- /dev/null
+++ b/test/test_projects/buck_tests_2/BUCK
@@ -0,0 +1,41 @@
+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
new file mode 100644
index 0000000000..f021317020
--- /dev/null
+++ b/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/BUCK
@@ -0,0 +1,25 @@
+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_projects/buck_tests_2/auto_gen/auto_gen_a/include/auto_gen_a.hrl b/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/include/auto_gen_a.hrl
similarity index 100%
rename from test_projects/buck_tests_2/auto_gen/auto_gen_a/include/auto_gen_a.hrl
rename to test/test_projects/buck_tests_2/auto_gen/auto_gen_a/include/auto_gen_a.hrl
diff --git a/test_projects/buck_tests_2/auto_gen/auto_gen_a/out/pretend_generated.erl b/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/out/pretend_generated.erl
similarity index 100%
rename from test_projects/buck_tests_2/auto_gen/auto_gen_a/out/pretend_generated.erl
rename to test/test_projects/buck_tests_2/auto_gen/auto_gen_a/out/pretend_generated.erl
diff --git a/test_projects/buck_tests_2/auto_gen/auto_gen_a/src/auto_gen_a.erl b/test/test_projects/buck_tests_2/auto_gen/auto_gen_a/src/auto_gen_a.erl
similarity index 100%
rename from test_projects/buck_tests_2/auto_gen/auto_gen_a/src/auto_gen_a.erl
rename to test/test_projects/buck_tests_2/auto_gen/auto_gen_a/src/auto_gen_a.erl
diff --git a/test_projects/buck_tests_2/check_include/src/top_includer.erl b/test/test_projects/buck_tests_2/check_include/src/top_includer.erl
similarity index 100%
rename from test_projects/buck_tests_2/check_include/src/top_includer.erl
rename to test/test_projects/buck_tests_2/check_include/src/top_includer.erl
diff --git a/test_projects/buck_tests_2/check_include_separate_1/include/include_with_bug.hrl b/test/test_projects/buck_tests_2/check_include_separate_1/include/include_with_bug.hrl
similarity index 100%
rename from test_projects/buck_tests_2/check_include_separate_1/include/include_with_bug.hrl
rename to test/test_projects/buck_tests_2/check_include_separate_1/include/include_with_bug.hrl
diff --git a/test_projects/buck_tests_2/check_include_separate_1/include/top_includer.hrl b/test/test_projects/buck_tests_2/check_include_separate_1/include/top_includer.hrl
similarity index 100%
rename from test_projects/buck_tests_2/check_include_separate_1/include/top_includer.hrl
rename to test/test_projects/buck_tests_2/check_include_separate_1/include/top_includer.hrl
diff --git a/test_projects/buck_tests_2/check_include_separate_2/include/separate_include.hrl b/test/test_projects/buck_tests_2/check_include_separate_2/include/separate_include.hrl
similarity index 100%
rename from test_projects/buck_tests_2/check_include_separate_2/include/separate_include.hrl
rename to test/test_projects/buck_tests_2/check_include_separate_2/include/separate_include.hrl
diff --git a/test/test_projects/buck_tests_2/generated/BUCK b/test/test_projects/buck_tests_2/generated/BUCK
new file mode 100644
index 0000000000..8eec40830b
--- /dev/null
+++ b/test/test_projects/buck_tests_2/generated/BUCK
@@ -0,0 +1,12 @@
+oncall("vscode_erlang")
+
+erlang_application(
+    name = "generated_headers",
+    includes = [
+        "out/generated_header.hrl",
+    ],
+    labels = ["generated"],
+    visibility = [
+        "PUBLIC",
+    ],
+)
diff --git a/test_projects/buck_tests_2/generated/out/generated_header.hrl b/test/test_projects/buck_tests_2/generated/out/generated_header.hrl
similarity index 100%
rename from test_projects/buck_tests_2/generated/out/generated_header.hrl
rename to test/test_projects/buck_tests_2/generated/out/generated_header.hrl
diff --git a/test/test_projects/buck_tests_2/util/app_a/BUCK b/test/test_projects/buck_tests_2/util/app_a/BUCK
new file mode 100644
index 0000000000..4231c1c6e8
--- /dev/null
+++ b/test/test_projects/buck_tests_2/util/app_a/BUCK
@@ -0,0 +1,16 @@
+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_projects/buck_tests_2/util/app_a/include/junk.hrl b/test/test_projects/buck_tests_2/util/app_a/include/junk.hrl
similarity index 100%
rename from test_projects/buck_tests_2/util/app_a/include/junk.hrl
rename to test/test_projects/buck_tests_2/util/app_a/include/junk.hrl
diff --git a/test_projects/buck_tests_2/util/app_a/src/app_a.erl b/test/test_projects/buck_tests_2/util/app_a/src/app_a.erl
similarity index 100%
rename from test_projects/buck_tests_2/util/app_a/src/app_a.erl
rename to test/test_projects/buck_tests_2/util/app_a/src/app_a.erl
diff --git a/test_projects/end_to_end/.elp.toml b/test/test_projects/codegen_test/.elp.toml
similarity index 50%
rename from test_projects/end_to_end/.elp.toml
rename to test/test_projects/codegen_test/.elp.toml
index f015956e45..f21fe1bc73 100644
--- a/test_projects/end_to_end/.elp.toml
+++ b/test/test_projects/codegen_test/.elp.toml
@@ -1,7 +1,7 @@
 [buck]
 enabled = true
 build_deps = false
-included_targets = ["fbcode//whatsapp/elp/test_projects/end_to_end/..."]
+included_targets = ["root//codegen_test/..."]
 
 [eqwalizer]
 enable_all = false
diff --git a/test/test_projects/codegen_test/BUCK b/test/test_projects/codegen_test/BUCK
new file mode 100644
index 0000000000..1df5f86eba
--- /dev/null
+++ b/test/test_projects/codegen_test/BUCK
@@ -0,0 +1,73 @@
+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
new file mode 100644
index 0000000000..1f73475d9d
--- /dev/null
+++ b/test/test_projects/codegen_test/README.md
@@ -0,0 +1,138 @@
+# 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
new file mode 100644
index 0000000000..7a38d49a24
--- /dev/null
+++ b/test/test_projects/codegen_test/app_a/src/codegen_test.app.src
@@ -0,0 +1,14 @@
+{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
new file mode 100644
index 0000000000..a624c2089b
--- /dev/null
+++ b/test/test_projects/codegen_test/app_a/src/example_usage.erl
@@ -0,0 +1,51 @@
+-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
new file mode 100644
index 0000000000..3c0135dcee
--- /dev/null
+++ b/test/test_projects/codegen_test/app_a/test/codegen_test_SUITE.erl
@@ -0,0 +1,73 @@
+%%% 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
new file mode 100644
index 0000000000..6b38c39425
--- /dev/null
+++ b/test/test_projects/codegen_test/generated/example_service_client.erl
@@ -0,0 +1,37 @@
+%%%-------------------------------------------------------------------
+%%% @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
new file mode 100644
index 0000000000..3f89adcba9
--- /dev/null
+++ b/test/test_projects/codegen_test/generated/example_service_types.erl
@@ -0,0 +1,55 @@
+%%%-------------------------------------------------------------------
+%%% @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
new file mode 100644
index 0000000000..4c957a0906
--- /dev/null
+++ b/test/test_projects/codegen_test/generated/example_service_types.hrl
@@ -0,0 +1,27 @@
+%%%-------------------------------------------------------------------
+%%% @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
new file mode 100644
index 0000000000..ab30a89f74
--- /dev/null
+++ b/test/test_projects/codegen_test/templates/example_service_client.erl
@@ -0,0 +1,38 @@
+%%%-------------------------------------------------------------------
+%%% @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
new file mode 100644
index 0000000000..833df167c6
--- /dev/null
+++ b/test/test_projects/codegen_test/templates/example_service_types.erl
@@ -0,0 +1,56 @@
+%%%-------------------------------------------------------------------
+%%% @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
new file mode 100644
index 0000000000..88a2e7aed2
--- /dev/null
+++ b/test/test_projects/codegen_test/templates/example_service_types.hrl
@@ -0,0 +1,28 @@
+%%%-------------------------------------------------------------------
+%%% @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_projects/custom_build_tool/.elp.toml b/test/test_projects/custom_build_tool/.elp.toml
similarity index 100%
rename from test_projects/custom_build_tool/.elp.toml
rename to test/test_projects/custom_build_tool/.elp.toml
diff --git a/test_projects/custom_build_tool/apps/app_a/include/app_a.hrl b/test/test_projects/custom_build_tool/apps/app_a/include/app_a.hrl
similarity index 100%
rename from test_projects/custom_build_tool/apps/app_a/include/app_a.hrl
rename to test/test_projects/custom_build_tool/apps/app_a/include/app_a.hrl
diff --git a/test_projects/custom_build_tool/apps/app_a/src/app_a.erl b/test/test_projects/custom_build_tool/apps/app_a/src/app_a.erl
similarity index 100%
rename from test_projects/custom_build_tool/apps/app_a/src/app_a.erl
rename to test/test_projects/custom_build_tool/apps/app_a/src/app_a.erl
diff --git a/test_projects/custom_build_tool/apps/app_b/src/app_b.erl b/test/test_projects/custom_build_tool/apps/app_b/src/app_b.erl
similarity index 100%
rename from test_projects/custom_build_tool/apps/app_b/src/app_b.erl
rename to test/test_projects/custom_build_tool/apps/app_b/src/app_b.erl
diff --git a/test/test_projects/diagnostics/.elp.toml b/test/test_projects/diagnostics/.elp.toml
new file mode 100644
index 0000000000..504ef547af
--- /dev/null
+++ b/test/test_projects/diagnostics/.elp.toml
@@ -0,0 +1,8 @@
+[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
new file mode 100644
index 0000000000..19c15e5acf
--- /dev/null
+++ b/test/test_projects/diagnostics/BUCK
@@ -0,0 +1,20 @@
+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_projects/diagnostics/README.md b/test/test_projects/diagnostics/README.md
similarity index 100%
rename from test_projects/diagnostics/README.md
rename to test/test_projects/diagnostics/README.md
diff --git a/test_projects/diagnostics/app_a/extra/app_a.erl b/test/test_projects/diagnostics/app_a/extra/app_a.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/extra/app_a.erl
rename to test/test_projects/diagnostics/app_a/extra/app_a.erl
diff --git a/test_projects/diagnostics/app_a/include/app_a.hrl b/test/test_projects/diagnostics/app_a/include/app_a.hrl
similarity index 100%
rename from test_projects/diagnostics/app_a/include/app_a.hrl
rename to test/test_projects/diagnostics/app_a/include/app_a.hrl
diff --git a/test_projects/diagnostics/app_a/include/broken_diagnostics.hrl b/test/test_projects/diagnostics/app_a/include/broken_diagnostics.hrl
similarity index 100%
rename from test_projects/diagnostics/app_a/include/broken_diagnostics.hrl
rename to test/test_projects/diagnostics/app_a/include/broken_diagnostics.hrl
diff --git a/test_projects/diagnostics/app_a/include/diagnostics.hrl b/test/test_projects/diagnostics/app_a/include/diagnostics.hrl
similarity index 100%
rename from test_projects/diagnostics/app_a/include/diagnostics.hrl
rename to test/test_projects/diagnostics/app_a/include/diagnostics.hrl
diff --git a/test_projects/diagnostics/app_a/src/app_a.app.src b/test/test_projects/diagnostics/app_a/src/app_a.app.src
similarity index 100%
rename from test_projects/diagnostics/app_a/src/app_a.app.src
rename to test/test_projects/diagnostics/app_a/src/app_a.app.src
diff --git a/test_projects/diagnostics/app_a/src/app_a.erl b/test/test_projects/diagnostics/app_a/src/app_a.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/src/app_a.erl
rename to test/test_projects/diagnostics/app_a/src/app_a.erl
diff --git a/test_projects/diagnostics/app_a/src/broken_parse_trans.erl b/test/test_projects/diagnostics/app_a/src/broken_parse_trans.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/src/broken_parse_trans.erl
rename to test/test_projects/diagnostics/app_a/src/broken_parse_trans.erl
diff --git a/test_projects/diagnostics/app_a/src/cascading.erl b/test/test_projects/diagnostics/app_a/src/cascading.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/src/cascading.erl
rename to test/test_projects/diagnostics/app_a/src/cascading.erl
diff --git a/test_projects/diagnostics/app_a/src/crlf.erl b/test/test_projects/diagnostics/app_a/src/crlf.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/src/crlf.erl
rename to test/test_projects/diagnostics/app_a/src/crlf.erl
diff --git a/test_projects/diagnostics/app_a/src/diagnostics.erl b/test/test_projects/diagnostics/app_a/src/diagnostics.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/src/diagnostics.erl
rename to test/test_projects/diagnostics/app_a/src/diagnostics.erl
diff --git a/test_projects/diagnostics/app_a/src/diagnostics.escript b/test/test_projects/diagnostics/app_a/src/diagnostics.escript
similarity index 100%
rename from test_projects/diagnostics/app_a/src/diagnostics.escript
rename to test/test_projects/diagnostics/app_a/src/diagnostics.escript
diff --git a/test_projects/diagnostics/app_a/src/diagnostics_errors.escript b/test/test_projects/diagnostics/app_a/src/diagnostics_errors.escript
similarity index 100%
rename from test_projects/diagnostics/app_a/src/diagnostics_errors.escript
rename to test/test_projects/diagnostics/app_a/src/diagnostics_errors.escript
diff --git a/test_projects/diagnostics/app_a/src/diagnostics_warnings.escript b/test/test_projects/diagnostics/app_a/src/diagnostics_warnings.escript
similarity index 100%
rename from test_projects/diagnostics/app_a/src/diagnostics_warnings.escript
rename to test/test_projects/diagnostics/app_a/src/diagnostics_warnings.escript
diff --git a/test_projects/diagnostics/app_a/src/erlang_diagnostics_errors_gen.erl b/test/test_projects/diagnostics/app_a/src/erlang_diagnostics_errors_gen.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/src/erlang_diagnostics_errors_gen.erl
rename to test/test_projects/diagnostics/app_a/src/erlang_diagnostics_errors_gen.erl
diff --git a/test_projects/diagnostics/app_a/src/file_attribute.erl b/test/test_projects/diagnostics/app_a/src/file_attribute.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/src/file_attribute.erl
rename to test/test_projects/diagnostics/app_a/src/file_attribute.erl
diff --git a/test_projects/diagnostics/app_a/src/lint_recursive.erl b/test/test_projects/diagnostics/app_a/src/lint_recursive.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/src/lint_recursive.erl
rename to test/test_projects/diagnostics/app_a/src/lint_recursive.erl
diff --git a/test_projects/diagnostics/app_a/src/lints.erl b/test/test_projects/diagnostics/app_a/src/lints.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/src/lints.erl
rename to test/test_projects/diagnostics/app_a/src/lints.erl
diff --git a/test_projects/diagnostics/app_a/src/otp27_docstrings.erl b/test/test_projects/diagnostics/app_a/src/otp27_docstrings.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/src/otp27_docstrings.erl
rename to test/test_projects/diagnostics/app_a/src/otp27_docstrings.erl
diff --git a/test_projects/diagnostics/app_a/src/otp27_sigils.erl b/test/test_projects/diagnostics/app_a/src/otp27_sigils.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/src/otp27_sigils.erl
rename to test/test_projects/diagnostics/app_a/src/otp27_sigils.erl
diff --git a/test_projects/diagnostics/app_a/src/otp_7655.erl b/test/test_projects/diagnostics/app_a/src/otp_7655.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/src/otp_7655.erl
rename to test/test_projects/diagnostics/app_a/src/otp_7655.erl
diff --git a/test_projects/diagnostics/app_a/src/parse_error_a_cascade.erl b/test/test_projects/diagnostics/app_a/src/parse_error_a_cascade.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/src/parse_error_a_cascade.erl
rename to test/test_projects/diagnostics/app_a/src/parse_error_a_cascade.erl
diff --git a/test_projects/diagnostics/app_a/src/suppressed.erl b/test/test_projects/diagnostics/app_a/src/suppressed.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/src/suppressed.erl
rename to test/test_projects/diagnostics/app_a/src/suppressed.erl
diff --git a/test_projects/diagnostics/app_a/src/syntax.erl b/test/test_projects/diagnostics/app_a/src/syntax.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/src/syntax.erl
rename to test/test_projects/diagnostics/app_a/src/syntax.erl
diff --git a/test_projects/diagnostics/app_a/test/app_a_SUITE.erl b/test/test_projects/diagnostics/app_a/test/app_a_SUITE.erl
similarity index 100%
rename from test_projects/diagnostics/app_a/test/app_a_SUITE.erl
rename to test/test_projects/diagnostics/app_a/test/app_a_SUITE.erl
diff --git a/test_projects/diagnostics/erlang_ls.config b/test/test_projects/diagnostics/erlang_ls.config
similarity index 100%
rename from test_projects/diagnostics/erlang_ls.config
rename to test/test_projects/diagnostics/erlang_ls.config
diff --git a/test_projects/diagnostics/rebar.config b/test/test_projects/diagnostics/rebar.config
similarity index 100%
rename from test_projects/diagnostics/rebar.config
rename to test/test_projects/diagnostics/rebar.config
diff --git a/test_projects/diagnostics/test_build_info.json b/test/test_projects/diagnostics/test_build_info.json
similarity index 100%
rename from test_projects/diagnostics/test_build_info.json
rename to test/test_projects/diagnostics/test_build_info.json
diff --git a/test/test_projects/end_to_end/.elp.toml b/test/test_projects/end_to_end/.elp.toml
new file mode 100644
index 0000000000..acbcd6146f
--- /dev/null
+++ b/test/test_projects/end_to_end/.elp.toml
@@ -0,0 +1,7 @@
+[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
new file mode 100644
index 0000000000..60d39de125
--- /dev/null
+++ b/test/test_projects/end_to_end/assist_examples/BUCK
@@ -0,0 +1,14 @@
+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_projects/end_to_end/assist_examples/src/add_doc.erl b/test/test_projects/end_to_end/assist_examples/src/add_doc.erl
similarity index 100%
rename from test_projects/end_to_end/assist_examples/src/add_doc.erl
rename to test/test_projects/end_to_end/assist_examples/src/add_doc.erl
diff --git a/test_projects/end_to_end/assist_examples/src/assist_examples.app.src b/test/test_projects/end_to_end/assist_examples/src/assist_examples.app.src
similarity index 100%
rename from test_projects/end_to_end/assist_examples/src/assist_examples.app.src
rename to test/test_projects/end_to_end/assist_examples/src/assist_examples.app.src
diff --git a/test_projects/end_to_end/assist_examples/src/code_completion.erl b/test/test_projects/end_to_end/assist_examples/src/code_completion.erl
similarity index 100%
rename from test_projects/end_to_end/assist_examples/src/code_completion.erl
rename to test/test_projects/end_to_end/assist_examples/src/code_completion.erl
diff --git a/test_projects/end_to_end/assist_examples/src/extract_function.erl b/test/test_projects/end_to_end/assist_examples/src/extract_function.erl
similarity index 100%
rename from test_projects/end_to_end/assist_examples/src/extract_function.erl
rename to test/test_projects/end_to_end/assist_examples/src/extract_function.erl
diff --git a/test_projects/end_to_end/assist_examples/src/head_mismatch.erl b/test/test_projects/end_to_end/assist_examples/src/head_mismatch.erl
similarity index 100%
rename from test_projects/end_to_end/assist_examples/src/head_mismatch.erl
rename to test/test_projects/end_to_end/assist_examples/src/head_mismatch.erl
diff --git a/test_projects/end_to_end/caf/configerator/source/whatsapp/my_caf.erl b/test/test_projects/end_to_end/caf/configerator/source/whatsapp/my_caf.erl
similarity index 100%
rename from test_projects/end_to_end/caf/configerator/source/whatsapp/my_caf.erl
rename to test/test_projects/end_to_end/caf/configerator/source/whatsapp/my_caf.erl
diff --git a/test/test_projects/end_to_end/definitions/BUCK b/test/test_projects/end_to_end/definitions/BUCK
new file mode 100644
index 0000000000..c9e6b204f4
--- /dev/null
+++ b/test/test_projects/end_to_end/definitions/BUCK
@@ -0,0 +1,14 @@
+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_projects/end_to_end/definitions/README.md b/test/test_projects/end_to_end/definitions/README.md
similarity index 100%
rename from test_projects/end_to_end/definitions/README.md
rename to test/test_projects/end_to_end/definitions/README.md
diff --git a/test_projects/end_to_end/definitions/src/definitions.app.src b/test/test_projects/end_to_end/definitions/src/definitions.app.src
similarity index 100%
rename from test_projects/end_to_end/definitions/src/definitions.app.src
rename to test/test_projects/end_to_end/definitions/src/definitions.app.src
diff --git a/test_projects/end_to_end/definitions/src/local_def.erl b/test/test_projects/end_to_end/definitions/src/local_def.erl
similarity index 100%
rename from test_projects/end_to_end/definitions/src/local_def.erl
rename to test/test_projects/end_to_end/definitions/src/local_def.erl
diff --git a/test/test_projects/end_to_end/docs/BUCK b/test/test_projects/end_to_end/docs/BUCK
new file mode 100644
index 0000000000..7429863b6e
--- /dev/null
+++ b/test/test_projects/end_to_end/docs/BUCK
@@ -0,0 +1,16 @@
+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_projects/end_to_end/docs/src/docs.app.src b/test/test_projects/end_to_end/docs/src/docs.app.src
similarity index 100%
rename from test_projects/end_to_end/docs/src/docs.app.src
rename to test/test_projects/end_to_end/docs/src/docs.app.src
diff --git a/test_projects/end_to_end/docs/src/docs.erl b/test/test_projects/end_to_end/docs/src/docs.erl
similarity index 100%
rename from test_projects/end_to_end/docs/src/docs.erl
rename to test/test_projects/end_to_end/docs/src/docs.erl
diff --git a/test_projects/end_to_end/erlang_ls.config b/test/test_projects/end_to_end/erlang_ls.config
similarity index 100%
rename from test_projects/end_to_end/erlang_ls.config
rename to test/test_projects/end_to_end/erlang_ls.config
diff --git a/test_projects/end_to_end/fixtures/erlang-stacktrace.txt b/test/test_projects/end_to_end/fixtures/erlang-stacktrace.txt
similarity index 100%
rename from test_projects/end_to_end/fixtures/erlang-stacktrace.txt
rename to test/test_projects/end_to_end/fixtures/erlang-stacktrace.txt
diff --git a/test/test_projects/end_to_end/hover/BUCK b/test/test_projects/end_to_end/hover/BUCK
new file mode 100644
index 0000000000..7732dc473e
--- /dev/null
+++ b/test/test_projects/end_to_end/hover/BUCK
@@ -0,0 +1,14 @@
+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_projects/end_to_end/hover/README.md b/test/test_projects/end_to_end/hover/README.md
similarity index 100%
rename from test_projects/end_to_end/hover/README.md
rename to test/test_projects/end_to_end/hover/README.md
diff --git a/test_projects/end_to_end/hover/src/doc_examples.erl b/test/test_projects/end_to_end/hover/src/doc_examples.erl
similarity index 100%
rename from test_projects/end_to_end/hover/src/doc_examples.erl
rename to test/test_projects/end_to_end/hover/src/doc_examples.erl
diff --git a/test_projects/end_to_end/hover/src/hover.app.src b/test/test_projects/end_to_end/hover/src/hover.app.src
similarity index 100%
rename from test_projects/end_to_end/hover/src/hover.app.src
rename to test/test_projects/end_to_end/hover/src/hover.app.src
diff --git a/test_projects/end_to_end/rebar.config b/test/test_projects/end_to_end/rebar.config
similarity index 100%
rename from test_projects/end_to_end/rebar.config
rename to test/test_projects/end_to_end/rebar.config
diff --git a/test/test_projects/end_to_end/single_errors/BUCK b/test/test_projects/end_to_end/single_errors/BUCK
new file mode 100644
index 0000000000..a8f6e478b0
--- /dev/null
+++ b/test/test_projects/end_to_end/single_errors/BUCK
@@ -0,0 +1,14 @@
+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_projects/end_to_end/single_errors/README.md b/test/test_projects/end_to_end/single_errors/README.md
similarity index 100%
rename from test_projects/end_to_end/single_errors/README.md
rename to test/test_projects/end_to_end/single_errors/README.md
diff --git a/test_projects/end_to_end/single_errors/src/as_you_type.erl b/test/test_projects/end_to_end/single_errors/src/as_you_type.erl
similarity index 100%
rename from test_projects/end_to_end/single_errors/src/as_you_type.erl
rename to test/test_projects/end_to_end/single_errors/src/as_you_type.erl
diff --git a/test_projects/end_to_end/single_errors/src/compiler_diagnostics.erl b/test/test_projects/end_to_end/single_errors/src/compiler_diagnostics.erl
similarity index 100%
rename from test_projects/end_to_end/single_errors/src/compiler_diagnostics.erl
rename to test/test_projects/end_to_end/single_errors/src/compiler_diagnostics.erl
diff --git a/test_projects/end_to_end/single_errors/src/single_errors.app.src b/test/test_projects/end_to_end/single_errors/src/single_errors.app.src
similarity index 100%
rename from test_projects/end_to_end/single_errors/src/single_errors.app.src
rename to test/test_projects/end_to_end/single_errors/src/single_errors.app.src
diff --git a/test_projects/end_to_end/single_errors/src/spec_mismatch.erl b/test/test_projects/end_to_end/single_errors/src/spec_mismatch.erl
similarity index 100%
rename from test_projects/end_to_end/single_errors/src/spec_mismatch.erl
rename to test/test_projects/end_to_end/single_errors/src/spec_mismatch.erl
diff --git a/test_projects/end_to_end/single_errors/src/spec_mismatch.erl.2 b/test/test_projects/end_to_end/single_errors/src/spec_mismatch.erl.2
similarity index 100%
rename from test_projects/end_to_end/single_errors/src/spec_mismatch.erl.2
rename to test/test_projects/end_to_end/single_errors/src/spec_mismatch.erl.2
diff --git a/test_projects/end_to_end/single_errors/src/types_on_hover.erl b/test/test_projects/end_to_end/single_errors/src/types_on_hover.erl
similarity index 100%
rename from test_projects/end_to_end/single_errors/src/types_on_hover.erl
rename to test/test_projects/end_to_end/single_errors/src/types_on_hover.erl
diff --git a/test_projects/end_to_end/single_errors/src/unused_macro.erl b/test/test_projects/end_to_end/single_errors/src/unused_macro.erl
similarity index 100%
rename from test_projects/end_to_end/single_errors/src/unused_macro.erl
rename to test/test_projects/end_to_end/single_errors/src/unused_macro.erl
diff --git a/test_projects/eqwalizer/src/eqwalizer.app.src b/test/test_projects/eqwalizer/src/eqwalizer.app.src
similarity index 100%
rename from test_projects/eqwalizer/src/eqwalizer.app.src
rename to test/test_projects/eqwalizer/src/eqwalizer.app.src
diff --git a/test_projects/eqwalizer/src/eqwalizer_specs.erl b/test/test_projects/eqwalizer/src/eqwalizer_specs.erl
similarity index 100%
rename from test_projects/eqwalizer/src/eqwalizer_specs.erl
rename to test/test_projects/eqwalizer/src/eqwalizer_specs.erl
diff --git a/test/test_projects/eqwalizer_callers/.elp.toml b/test/test_projects/eqwalizer_callers/.elp.toml
new file mode 100644
index 0000000000..68476bcf2e
--- /dev/null
+++ b/test/test_projects/eqwalizer_callers/.elp.toml
@@ -0,0 +1,5 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "root//eqwalizer_callers/..." ]
+source_root = "eqwalizer_callers"
diff --git a/test_projects/eqwalizer_callers/.gitignore b/test/test_projects/eqwalizer_callers/.gitignore
similarity index 100%
rename from test_projects/eqwalizer_callers/.gitignore
rename to test/test_projects/eqwalizer_callers/.gitignore
diff --git a/test/test_projects/eqwalizer_callers/BUCK b/test/test_projects/eqwalizer_callers/BUCK
new file mode 100644
index 0000000000..32012a0dc0
--- /dev/null
+++ b/test/test_projects/eqwalizer_callers/BUCK
@@ -0,0 +1,19 @@
+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_projects/eqwalizer_callers/app_a/include/app_a.hrl b/test/test_projects/eqwalizer_callers/app_a/include/app_a.hrl
similarity index 100%
rename from test_projects/eqwalizer_callers/app_a/include/app_a.hrl
rename to test/test_projects/eqwalizer_callers/app_a/include/app_a.hrl
diff --git a/test_projects/eqwalizer_callers/app_a/src/app_a.app.src b/test/test_projects/eqwalizer_callers/app_a/src/app_a.app.src
similarity index 100%
rename from test_projects/eqwalizer_callers/app_a/src/app_a.app.src
rename to test/test_projects/eqwalizer_callers/app_a/src/app_a.app.src
diff --git a/test_projects/eqwalizer_callers/app_a/src/app_a.erl b/test/test_projects/eqwalizer_callers/app_a/src/app_a.erl
similarity index 100%
rename from test_projects/eqwalizer_callers/app_a/src/app_a.erl
rename to test/test_projects/eqwalizer_callers/app_a/src/app_a.erl
diff --git a/test_projects/eqwalizer_callers/app_a/src/app_b.erl b/test/test_projects/eqwalizer_callers/app_a/src/app_b.erl
similarity index 100%
rename from test_projects/eqwalizer_callers/app_a/src/app_b.erl
rename to test/test_projects/eqwalizer_callers/app_a/src/app_b.erl
diff --git a/test_projects/eqwalizer_callers/app_a/test/app_a_SUITE.erl b/test/test_projects/eqwalizer_callers/app_a/test/app_a_SUITE.erl
similarity index 100%
rename from test_projects/eqwalizer_callers/app_a/test/app_a_SUITE.erl
rename to test/test_projects/eqwalizer_callers/app_a/test/app_a_SUITE.erl
diff --git a/test_projects/eqwalizer_callers/rebar.config b/test/test_projects/eqwalizer_callers/rebar.config
similarity index 100%
rename from test_projects/eqwalizer_callers/rebar.config
rename to test/test_projects/eqwalizer_callers/rebar.config
diff --git a/test_projects/eqwalizer_ignore_modules/.elp.toml b/test/test_projects/eqwalizer_ignore_modules/.elp.toml
similarity index 100%
rename from test_projects/eqwalizer_ignore_modules/.elp.toml
rename to test/test_projects/eqwalizer_ignore_modules/.elp.toml
diff --git a/test_projects/eqwalizer_ignore_modules/apps/app_a/include/app_a.hrl b/test/test_projects/eqwalizer_ignore_modules/apps/app_a/include/app_a.hrl
similarity index 100%
rename from test_projects/eqwalizer_ignore_modules/apps/app_a/include/app_a.hrl
rename to test/test_projects/eqwalizer_ignore_modules/apps/app_a/include/app_a.hrl
diff --git a/test_projects/eqwalizer_ignore_modules/apps/app_a/src/another_module_a.erl b/test/test_projects/eqwalizer_ignore_modules/apps/app_a/src/another_module_a.erl
similarity index 100%
rename from test_projects/eqwalizer_ignore_modules/apps/app_a/src/another_module_a.erl
rename to test/test_projects/eqwalizer_ignore_modules/apps/app_a/src/another_module_a.erl
diff --git a/test_projects/eqwalizer_ignore_modules/apps/app_a/src/app_a.erl b/test/test_projects/eqwalizer_ignore_modules/apps/app_a/src/app_a.erl
similarity index 100%
rename from test_projects/eqwalizer_ignore_modules/apps/app_a/src/app_a.erl
rename to test/test_projects/eqwalizer_ignore_modules/apps/app_a/src/app_a.erl
diff --git a/test_projects/eqwalizer_ignore_modules/apps/app_b/src/app_b.erl b/test/test_projects/eqwalizer_ignore_modules/apps/app_b/src/app_b.erl
similarity index 100%
rename from test_projects/eqwalizer_ignore_modules/apps/app_b/src/app_b.erl
rename to test/test_projects/eqwalizer_ignore_modules/apps/app_b/src/app_b.erl
diff --git a/test/test_projects/eqwalizer_tests/.elp.toml b/test/test_projects/eqwalizer_tests/.elp.toml
new file mode 100644
index 0000000000..5dac3aa6a6
--- /dev/null
+++ b/test/test_projects/eqwalizer_tests/.elp.toml
@@ -0,0 +1,8 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "root//eqwalizer_tests/..." ]
+source_root = "eqwalizer_tests"
+
+[eqwalizer]
+enable_all = true
diff --git a/test_projects/eqwalizer_tests/.gitignore b/test/test_projects/eqwalizer_tests/.gitignore
similarity index 100%
rename from test_projects/eqwalizer_tests/.gitignore
rename to test/test_projects/eqwalizer_tests/.gitignore
diff --git a/test_projects/eqwalizer_tests/.rebar.root b/test/test_projects/eqwalizer_tests/.rebar.root
similarity index 100%
rename from test_projects/eqwalizer_tests/.rebar.root
rename to test/test_projects/eqwalizer_tests/.rebar.root
diff --git a/test/test_projects/eqwalizer_tests/BUCK b/test/test_projects/eqwalizer_tests/BUCK
new file mode 100644
index 0000000000..0817873cb0
--- /dev/null
+++ b/test/test_projects/eqwalizer_tests/BUCK
@@ -0,0 +1,77 @@
+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_projects/eqwalizer_tests/check/include/my_header.hrl b/test/test_projects/eqwalizer_tests/check/include/my_header.hrl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/include/my_header.hrl
rename to test/test_projects/eqwalizer_tests/check/include/my_header.hrl
diff --git a/test_projects/eqwalizer_tests/check/src/any_fun_type.erl b/test/test_projects/eqwalizer_tests/check/src/any_fun_type.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/any_fun_type.erl
rename to test/test_projects/eqwalizer_tests/check/src/any_fun_type.erl
diff --git a/test_projects/eqwalizer_tests/check/src/apply_none.erl b/test/test_projects/eqwalizer_tests/check/src/apply_none.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/apply_none.erl
rename to test/test_projects/eqwalizer_tests/check/src/apply_none.erl
diff --git a/test_projects/eqwalizer_tests/check/src/approx.erl b/test/test_projects/eqwalizer_tests/check/src/approx.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/approx.erl
rename to test/test_projects/eqwalizer_tests/check/src/approx.erl
diff --git a/test_projects/eqwalizer_tests/check/src/as_pat.erl b/test/test_projects/eqwalizer_tests/check/src/as_pat.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/as_pat.erl
rename to test/test_projects/eqwalizer_tests/check/src/as_pat.erl
diff --git a/test_projects/eqwalizer_tests/check/src/auto_imports.erl b/test/test_projects/eqwalizer_tests/check/src/auto_imports.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/auto_imports.erl
rename to test/test_projects/eqwalizer_tests/check/src/auto_imports.erl
diff --git a/test_projects/eqwalizer_tests/check/src/behave.erl b/test/test_projects/eqwalizer_tests/check/src/behave.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/behave.erl
rename to test/test_projects/eqwalizer_tests/check/src/behave.erl
diff --git a/test_projects/eqwalizer_tests/check/src/binaries.erl b/test/test_projects/eqwalizer_tests/check/src/binaries.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/binaries.erl
rename to test/test_projects/eqwalizer_tests/check/src/binaries.erl
diff --git a/test_projects/eqwalizer_tests/check/src/booleans.erl b/test/test_projects/eqwalizer_tests/check/src/booleans.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/booleans.erl
rename to test/test_projects/eqwalizer_tests/check/src/booleans.erl
diff --git a/test_projects/eqwalizer_tests/check/src/callbacks1_pos.erl b/test/test_projects/eqwalizer_tests/check/src/callbacks1_pos.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/callbacks1_pos.erl
rename to test/test_projects/eqwalizer_tests/check/src/callbacks1_pos.erl
diff --git a/test_projects/eqwalizer_tests/check/src/callbacks3_neg.erl b/test/test_projects/eqwalizer_tests/check/src/callbacks3_neg.erl
similarity index 70%
rename from test_projects/eqwalizer_tests/check/src/callbacks3_neg.erl
rename to test/test_projects/eqwalizer_tests/check/src/callbacks3_neg.erl
index 8152487669..854feec923 100644
--- a/test_projects/eqwalizer_tests/check/src/callbacks3_neg.erl
+++ b/test/test_projects/eqwalizer_tests/check/src/callbacks3_neg.erl
@@ -3,11 +3,12 @@
 %%% 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). % @OTPVersionDependent
+-module(callbacks3_neg). % @OTP27Only
 -export([
     init/1,
     handle_call/3,
-    handle_cast/2
+    handle_cast/2,
+    handle_info/2
 ]).
 -behavior(gen_server).
 
@@ -19,3 +20,7 @@ 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_projects/eqwalizer_tests/check/src/callbacks4_neg.erl b/test/test_projects/eqwalizer_tests/check/src/callbacks4_neg.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/callbacks4_neg.erl
rename to test/test_projects/eqwalizer_tests/check/src/callbacks4_neg.erl
diff --git a/test_projects/eqwalizer_tests/check/src/callbacks5_neg.erl b/test/test_projects/eqwalizer_tests/check/src/callbacks5_neg.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/callbacks5_neg.erl
rename to test/test_projects/eqwalizer_tests/check/src/callbacks5_neg.erl
diff --git a/test_projects/eqwalizer_tests/check/src/callbacks6_neg.erl b/test/test_projects/eqwalizer_tests/check/src/callbacks6_neg.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/callbacks6_neg.erl
rename to test/test_projects/eqwalizer_tests/check/src/callbacks6_neg.erl
diff --git a/test_projects/eqwalizer_tests/check/src/callbacks7_overload_pos.erl b/test/test_projects/eqwalizer_tests/check/src/callbacks7_overload_pos.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/callbacks7_overload_pos.erl
rename to test/test_projects/eqwalizer_tests/check/src/callbacks7_overload_pos.erl
diff --git a/test_projects/eqwalizer_tests/check/src/case_predicates.erl b/test/test_projects/eqwalizer_tests/check/src/case_predicates.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/case_predicates.erl
rename to test/test_projects/eqwalizer_tests/check/src/case_predicates.erl
diff --git a/test_projects/eqwalizer_tests/check/src/check.app.src b/test/test_projects/eqwalizer_tests/check/src/check.app.src
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/check.app.src
rename to test/test_projects/eqwalizer_tests/check/src/check.app.src
diff --git a/test_projects/eqwalizer_tests/check/src/compiler_macro.erl b/test/test_projects/eqwalizer_tests/check/src/compiler_macro.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/compiler_macro.erl
rename to test/test_projects/eqwalizer_tests/check/src/compiler_macro.erl
diff --git a/test_projects/eqwalizer_tests/check/src/complex_maps.erl b/test/test_projects/eqwalizer_tests/check/src/complex_maps.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/complex_maps.erl
rename to test/test_projects/eqwalizer_tests/check/src/complex_maps.erl
diff --git a/test_projects/eqwalizer_tests/check/src/comprehensions.erl b/test/test_projects/eqwalizer_tests/check/src/comprehensions.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/comprehensions.erl
rename to test/test_projects/eqwalizer_tests/check/src/comprehensions.erl
diff --git a/test_projects/eqwalizer_tests/check/src/contravariant.erl b/test/test_projects/eqwalizer_tests/check/src/contravariant.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/contravariant.erl
rename to test/test_projects/eqwalizer_tests/check/src/contravariant.erl
diff --git a/test_projects/eqwalizer_tests/check/src/custom.erl b/test/test_projects/eqwalizer_tests/check/src/custom.erl
similarity index 99%
rename from test_projects/eqwalizer_tests/check/src/custom.erl
rename to test/test_projects/eqwalizer_tests/check/src/custom.erl
index 911bfa3a0a..b6910b0fc7 100644
--- a/test_projects/eqwalizer_tests/check/src/custom.erl
+++ b/test/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). % @OTPVersionDependent
+-module(custom). % @OTP27Only
 
 -import(maps, [get/2, get/3]).
 -compile([export_all, nowarn_export_all]).
diff --git a/test_projects/eqwalizer_tests/check/src/detached_specs1.erl b/test/test_projects/eqwalizer_tests/check/src/detached_specs1.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/detached_specs1.erl
rename to test/test_projects/eqwalizer_tests/check/src/detached_specs1.erl
diff --git a/test_projects/eqwalizer_tests/check/src/detached_specs2.erl b/test/test_projects/eqwalizer_tests/check/src/detached_specs2.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/detached_specs2.erl
rename to test/test_projects/eqwalizer_tests/check/src/detached_specs2.erl
diff --git a/test_projects/eqwalizer_tests/check/src/dyn_calls.erl b/test/test_projects/eqwalizer_tests/check/src/dyn_calls.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/dyn_calls.erl
rename to test/test_projects/eqwalizer_tests/check/src/dyn_calls.erl
diff --git a/test_projects/eqwalizer_tests/check/src/dyn_remote_funs.erl b/test/test_projects/eqwalizer_tests/check/src/dyn_remote_funs.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/dyn_remote_funs.erl
rename to test/test_projects/eqwalizer_tests/check/src/dyn_remote_funs.erl
diff --git a/test_projects/eqwalizer_tests/check/src/dynamic_callbacks_1.erl b/test/test_projects/eqwalizer_tests/check/src/dynamic_callbacks_1.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/dynamic_callbacks_1.erl
rename to test/test_projects/eqwalizer_tests/check/src/dynamic_callbacks_1.erl
diff --git a/test_projects/eqwalizer_tests/check/src/dynamic_callbacks_2.erl b/test/test_projects/eqwalizer_tests/check/src/dynamic_callbacks_2.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/dynamic_callbacks_2.erl
rename to test/test_projects/eqwalizer_tests/check/src/dynamic_callbacks_2.erl
diff --git a/test_projects/eqwalizer_tests/check/src/dynamic_calls.erl b/test/test_projects/eqwalizer_tests/check/src/dynamic_calls.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/dynamic_calls.erl
rename to test/test_projects/eqwalizer_tests/check/src/dynamic_calls.erl
diff --git a/test_projects/eqwalizer_tests/check/src/dynamic_catch.erl b/test/test_projects/eqwalizer_tests/check/src/dynamic_catch.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/dynamic_catch.erl
rename to test/test_projects/eqwalizer_tests/check/src/dynamic_catch.erl
diff --git a/test_projects/eqwalizer_tests/check/src/dynamic_fun.erl b/test/test_projects/eqwalizer_tests/check/src/dynamic_fun.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/dynamic_fun.erl
rename to test/test_projects/eqwalizer_tests/check/src/dynamic_fun.erl
diff --git a/test_projects/eqwalizer_tests/check/src/dynamic_generics.erl b/test/test_projects/eqwalizer_tests/check/src/dynamic_generics.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/dynamic_generics.erl
rename to test/test_projects/eqwalizer_tests/check/src/dynamic_generics.erl
diff --git a/test_projects/eqwalizer_tests/check/src/dynamic_local_funs.erl b/test/test_projects/eqwalizer_tests/check/src/dynamic_local_funs.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/dynamic_local_funs.erl
rename to test/test_projects/eqwalizer_tests/check/src/dynamic_local_funs.erl
diff --git a/test_projects/eqwalizer_tests/check/src/dynamic_receive.erl b/test/test_projects/eqwalizer_tests/check/src/dynamic_receive.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/dynamic_receive.erl
rename to test/test_projects/eqwalizer_tests/check/src/dynamic_receive.erl
diff --git a/test_projects/eqwalizer_tests/check/src/dynamic_refine.erl b/test/test_projects/eqwalizer_tests/check/src/dynamic_refine.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/dynamic_refine.erl
rename to test/test_projects/eqwalizer_tests/check/src/dynamic_refine.erl
diff --git a/test_projects/eqwalizer_tests/check/src/dynamic_try_catch.erl b/test/test_projects/eqwalizer_tests/check/src/dynamic_try_catch.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/dynamic_try_catch.erl
rename to test/test_projects/eqwalizer_tests/check/src/dynamic_try_catch.erl
diff --git a/test_projects/eqwalizer_tests/check/src/elab_clause.erl b/test/test_projects/eqwalizer_tests/check/src/elab_clause.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/elab_clause.erl
rename to test/test_projects/eqwalizer_tests/check/src/elab_clause.erl
diff --git a/test_projects/eqwalizer_tests/check/src/error_messages.erl b/test/test_projects/eqwalizer_tests/check/src/error_messages.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/error_messages.erl
rename to test/test_projects/eqwalizer_tests/check/src/error_messages.erl
diff --git a/test_projects/eqwalizer_tests/check/src/fancy_generics.erl b/test/test_projects/eqwalizer_tests/check/src/fancy_generics.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/fancy_generics.erl
rename to test/test_projects/eqwalizer_tests/check/src/fancy_generics.erl
diff --git a/test_projects/eqwalizer_tests/check/src/format.erl b/test/test_projects/eqwalizer_tests/check/src/format.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/format.erl
rename to test/test_projects/eqwalizer_tests/check/src/format.erl
diff --git a/test_projects/eqwalizer_tests/check/src/fun_stats.erl b/test/test_projects/eqwalizer_tests/check/src/fun_stats.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/fun_stats.erl
rename to test/test_projects/eqwalizer_tests/check/src/fun_stats.erl
diff --git a/test_projects/eqwalizer_tests/check/src/fun_stats2.erl b/test/test_projects/eqwalizer_tests/check/src/fun_stats2.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/fun_stats2.erl
rename to test/test_projects/eqwalizer_tests/check/src/fun_stats2.erl
diff --git a/test_projects/eqwalizer_tests/check/src/funs.erl b/test/test_projects/eqwalizer_tests/check/src/funs.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/funs.erl
rename to test/test_projects/eqwalizer_tests/check/src/funs.erl
diff --git a/test_projects/eqwalizer_tests/check/src/funs2.erl b/test/test_projects/eqwalizer_tests/check/src/funs2.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/funs2.erl
rename to test/test_projects/eqwalizer_tests/check/src/funs2.erl
diff --git a/test_projects/eqwalizer_tests/check/src/funs_uncommon.erl b/test/test_projects/eqwalizer_tests/check/src/funs_uncommon.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/funs_uncommon.erl
rename to test/test_projects/eqwalizer_tests/check/src/funs_uncommon.erl
diff --git a/test_projects/eqwalizer_tests/check/src/generic_fun_application.erl b/test/test_projects/eqwalizer_tests/check/src/generic_fun_application.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/generic_fun_application.erl
rename to test/test_projects/eqwalizer_tests/check/src/generic_fun_application.erl
diff --git a/test_projects/eqwalizer_tests/check/src/generics_with_unions.erl b/test/test_projects/eqwalizer_tests/check/src/generics_with_unions.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/generics_with_unions.erl
rename to test/test_projects/eqwalizer_tests/check/src/generics_with_unions.erl
diff --git a/test_projects/eqwalizer_tests/check/src/gradual_bounded.erl b/test/test_projects/eqwalizer_tests/check/src/gradual_bounded.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/gradual_bounded.erl
rename to test/test_projects/eqwalizer_tests/check/src/gradual_bounded.erl
diff --git a/test_projects/eqwalizer_tests/check/src/gradual_complex_types.erl b/test/test_projects/eqwalizer_tests/check/src/gradual_complex_types.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/check/src/gradual_complex_types.erl
rename to test/test_projects/eqwalizer_tests/check/src/gradual_complex_types.erl
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similarity index 100%
rename from test_projects/eqwalizer_tests/debug/src/wip_maps.erl
rename to test/test_projects/eqwalizer_tests/debug/src/wip_maps.erl
diff --git a/test_projects/eqwalizer_tests/elm_core/src/basics.erl b/test/test_projects/eqwalizer_tests/elm_core/src/basics.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/elm_core/src/basics.erl
rename to test/test_projects/eqwalizer_tests/elm_core/src/basics.erl
diff --git a/test_projects/eqwalizer_tests/elm_core/src/elm_core.app.src b/test/test_projects/eqwalizer_tests/elm_core/src/elm_core.app.src
similarity index 100%
rename from test_projects/eqwalizer_tests/elm_core/src/elm_core.app.src
rename to test/test_projects/eqwalizer_tests/elm_core/src/elm_core.app.src
diff --git a/test_projects/eqwalizer_tests/elm_core/src/list.erl b/test/test_projects/eqwalizer_tests/elm_core/src/list.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/elm_core/src/list.erl
rename to test/test_projects/eqwalizer_tests/elm_core/src/list.erl
diff --git a/test_projects/eqwalizer_tests/elm_core/src/map.erl b/test/test_projects/eqwalizer_tests/elm_core/src/map.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/elm_core/src/map.erl
rename to test/test_projects/eqwalizer_tests/elm_core/src/map.erl
diff --git a/test_projects/eqwalizer_tests/elm_core/src/map_ffi.erl b/test/test_projects/eqwalizer_tests/elm_core/src/map_ffi.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/elm_core/src/map_ffi.erl
rename to test/test_projects/eqwalizer_tests/elm_core/src/map_ffi.erl
diff --git a/test_projects/eqwalizer_tests/elm_core/src/maybe.erl b/test/test_projects/eqwalizer_tests/elm_core/src/maybe.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/elm_core/src/maybe.erl
rename to test/test_projects/eqwalizer_tests/elm_core/src/maybe.erl
diff --git a/test_projects/eqwalizer_tests/elm_core/src/result.erl b/test/test_projects/eqwalizer_tests/elm_core/src/result.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/elm_core/src/result.erl
rename to test/test_projects/eqwalizer_tests/elm_core/src/result.erl
diff --git a/test_projects/eqwalizer_tests/elm_core/src/tuple.erl b/test/test_projects/eqwalizer_tests/elm_core/src/tuple.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/elm_core/src/tuple.erl
rename to test/test_projects/eqwalizer_tests/elm_core/src/tuple.erl
diff --git a/test_projects/eqwalizer_tests/eqwalizer/include/eqwalizer.hrl b/test/test_projects/eqwalizer_tests/eqwalizer/include/eqwalizer.hrl
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwalizer/include/eqwalizer.hrl
rename to test/test_projects/eqwalizer_tests/eqwalizer/include/eqwalizer.hrl
diff --git a/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer.app.src b/test/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer.app.src
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer.app.src
rename to test/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer.app.src
diff --git a/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer.erl b/test/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer.erl
rename to test/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer.erl
diff --git a/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer_specs.erl b/test/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer_specs.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer_specs.erl
rename to test/test_projects/eqwalizer_tests/eqwalizer/src/eqwalizer_specs.erl
diff --git a/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_build_info_prv.erl b/test/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_build_info_prv.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_build_info_prv.erl
rename to test/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_build_info_prv.erl
diff --git a/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_rebar3.app.src b/test/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_rebar3.app.src
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_rebar3.app.src
rename to test/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_rebar3.app.src
diff --git a/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_rebar3.erl b/test/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_rebar3.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_rebar3.erl
rename to test/test_projects/eqwalizer_tests/eqwalizer_rebar3/src/eqwalizer_rebar3.erl
diff --git a/test_projects/eqwalizer_tests/eqwater/readme.md b/test/test_projects/eqwalizer_tests/eqwater/readme.md
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwater/readme.md
rename to test/test_projects/eqwalizer_tests/eqwater/readme.md
diff --git a/test_projects/eqwalizer_tests/eqwater/src/deep_tuples.erl b/test/test_projects/eqwalizer_tests/eqwater/src/deep_tuples.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwater/src/deep_tuples.erl
rename to test/test_projects/eqwalizer_tests/eqwater/src/deep_tuples.erl
diff --git a/test_projects/eqwalizer_tests/eqwater/src/eqwater.app.src b/test/test_projects/eqwalizer_tests/eqwater/src/eqwater.app.src
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwater/src/eqwater.app.src
rename to test/test_projects/eqwalizer_tests/eqwater/src/eqwater.app.src
diff --git a/test_projects/eqwalizer_tests/eqwater/src/eqwater.erl b/test/test_projects/eqwalizer_tests/eqwater/src/eqwater.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwater/src/eqwater.erl
rename to test/test_projects/eqwalizer_tests/eqwater/src/eqwater.erl
diff --git a/test_projects/eqwalizer_tests/eqwater/src/eqwater_aliases.erl b/test/test_projects/eqwalizer_tests/eqwater/src/eqwater_aliases.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwater/src/eqwater_aliases.erl
rename to test/test_projects/eqwalizer_tests/eqwater/src/eqwater_aliases.erl
diff --git a/test_projects/eqwalizer_tests/eqwater/src/eqwater_generics.erl b/test/test_projects/eqwalizer_tests/eqwater/src/eqwater_generics.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwater/src/eqwater_generics.erl
rename to test/test_projects/eqwalizer_tests/eqwater/src/eqwater_generics.erl
diff --git a/test_projects/eqwalizer_tests/eqwater/src/eqwater_lists.erl b/test/test_projects/eqwalizer_tests/eqwater/src/eqwater_lists.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwater/src/eqwater_lists.erl
rename to test/test_projects/eqwalizer_tests/eqwater/src/eqwater_lists.erl
diff --git a/test_projects/eqwalizer_tests/eqwater/src/eqwater_maps.erl b/test/test_projects/eqwalizer_tests/eqwater/src/eqwater_maps.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwater/src/eqwater_maps.erl
rename to test/test_projects/eqwalizer_tests/eqwater/src/eqwater_maps.erl
diff --git a/test_projects/eqwalizer_tests/eqwater/src/eqwater_records.erl b/test/test_projects/eqwalizer_tests/eqwater/src/eqwater_records.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwater/src/eqwater_records.erl
rename to test/test_projects/eqwalizer_tests/eqwater/src/eqwater_records.erl
diff --git a/test_projects/eqwalizer_tests/eqwater/src/eqwater_sound.erl b/test/test_projects/eqwalizer_tests/eqwater/src/eqwater_sound.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwater/src/eqwater_sound.erl
rename to test/test_projects/eqwalizer_tests/eqwater/src/eqwater_sound.erl
diff --git a/test_projects/eqwalizer_tests/eqwater/src/unlimited_refinement.erl b/test/test_projects/eqwalizer_tests/eqwater/src/unlimited_refinement.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/eqwater/src/unlimited_refinement.erl
rename to test/test_projects/eqwalizer_tests/eqwater/src/unlimited_refinement.erl
diff --git a/test_projects/standard/app_a/.eqwalizer b/test/test_projects/eqwalizer_tests/fault_tolerance/.eqwalizer
similarity index 100%
rename from test_projects/standard/app_a/.eqwalizer
rename to test/test_projects/eqwalizer_tests/fault_tolerance/.eqwalizer
diff --git a/test_projects/eqwalizer_tests/fault_tolerance/src/fault_tolerance.app.src b/test/test_projects/eqwalizer_tests/fault_tolerance/src/fault_tolerance.app.src
similarity index 100%
rename from test_projects/eqwalizer_tests/fault_tolerance/src/fault_tolerance.app.src
rename to test/test_projects/eqwalizer_tests/fault_tolerance/src/fault_tolerance.app.src
diff --git a/test_projects/eqwalizer_tests/fault_tolerance/src/fault_tolerance.erl b/test/test_projects/eqwalizer_tests/fault_tolerance/src/fault_tolerance.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/fault_tolerance/src/fault_tolerance.erl
rename to test/test_projects/eqwalizer_tests/fault_tolerance/src/fault_tolerance.erl
diff --git a/test_projects/eqwalizer_tests/options/src/bad_maps.erl b/test/test_projects/eqwalizer_tests/options/src/bad_maps.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/options/src/bad_maps.erl
rename to test/test_projects/eqwalizer_tests/options/src/bad_maps.erl
diff --git a/test_projects/eqwalizer_tests/options/src/dynamic_lambdas.erl b/test/test_projects/eqwalizer_tests/options/src/dynamic_lambdas.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/options/src/dynamic_lambdas.erl
rename to test/test_projects/eqwalizer_tests/options/src/dynamic_lambdas.erl
diff --git a/test_projects/eqwalizer_tests/options/src/options.app.src b/test/test_projects/eqwalizer_tests/options/src/options.app.src
similarity index 100%
rename from test_projects/eqwalizer_tests/options/src/options.app.src
rename to test/test_projects/eqwalizer_tests/options/src/options.app.src
diff --git a/test_projects/eqwalizer_tests/options/src/overloaded_specs_dynamic_result.erl b/test/test_projects/eqwalizer_tests/options/src/overloaded_specs_dynamic_result.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/options/src/overloaded_specs_dynamic_result.erl
rename to test/test_projects/eqwalizer_tests/options/src/overloaded_specs_dynamic_result.erl
diff --git a/test_projects/eqwalizer_tests/options/src/redundant_guards.erl b/test/test_projects/eqwalizer_tests/options/src/redundant_guards.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/options/src/redundant_guards.erl
rename to test/test_projects/eqwalizer_tests/options/src/redundant_guards.erl
diff --git a/test_projects/eqwalizer_tests/options/src/uncovered_clauses.erl b/test/test_projects/eqwalizer_tests/options/src/uncovered_clauses.erl
similarity index 100%
rename from test_projects/eqwalizer_tests/options/src/uncovered_clauses.erl
rename to test/test_projects/eqwalizer_tests/options/src/uncovered_clauses.erl
diff --git a/test_projects/eqwalizer_tests/rebar.config b/test/test_projects/eqwalizer_tests/rebar.config
similarity index 100%
rename from test_projects/eqwalizer_tests/rebar.config
rename to test/test_projects/eqwalizer_tests/rebar.config
diff --git a/test/test_projects/hierarchical_config/.elp.toml b/test/test_projects/hierarchical_config/.elp.toml
new file mode 100644
index 0000000000..e4d04eb6e0
--- /dev/null
+++ b/test/test_projects/hierarchical_config/.elp.toml
@@ -0,0 +1,5 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "root//hierarchical_config/..." ]
+source_root = "hierarchical_config"
diff --git a/test_projects/hierarchical_config/.elp_lint.toml b/test/test_projects/hierarchical_config/.elp_lint.toml
similarity index 100%
rename from test_projects/hierarchical_config/.elp_lint.toml
rename to test/test_projects/hierarchical_config/.elp_lint.toml
diff --git a/test/test_projects/hierarchical_config/BUCK b/test/test_projects/hierarchical_config/BUCK
new file mode 100644
index 0000000000..bc78a42d57
--- /dev/null
+++ b/test/test_projects/hierarchical_config/BUCK
@@ -0,0 +1,23 @@
+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_projects/hierarchical_config/app_a/.elp_lint.toml b/test/test_projects/hierarchical_config/app_a/.elp_lint.toml
similarity index 100%
rename from test_projects/hierarchical_config/app_a/.elp_lint.toml
rename to test/test_projects/hierarchical_config/app_a/.elp_lint.toml
diff --git a/test_projects/hierarchical_config/app_a/src/app_a.app.src b/test/test_projects/hierarchical_config/app_a/src/app_a.app.src
similarity index 100%
rename from test_projects/hierarchical_config/app_a/src/app_a.app.src
rename to test/test_projects/hierarchical_config/app_a/src/app_a.app.src
diff --git a/test_projects/hierarchical_config/app_a/src/app_a.erl b/test/test_projects/hierarchical_config/app_a/src/app_a.erl
similarity index 100%
rename from test_projects/hierarchical_config/app_a/src/app_a.erl
rename to test/test_projects/hierarchical_config/app_a/src/app_a.erl
diff --git a/test_projects/hierarchical_config/app_b/src/app_b.app.src b/test/test_projects/hierarchical_config/app_b/src/app_b.app.src
similarity index 100%
rename from test_projects/hierarchical_config/app_b/src/app_b.app.src
rename to test/test_projects/hierarchical_config/app_b/src/app_b.app.src
diff --git a/test_projects/hierarchical_config/app_b/src/app_b.erl b/test/test_projects/hierarchical_config/app_b/src/app_b.erl
similarity index 100%
rename from test_projects/hierarchical_config/app_b/src/app_b.erl
rename to test/test_projects/hierarchical_config/app_b/src/app_b.erl
diff --git a/test_projects/hierarchical_config/rebar.config b/test/test_projects/hierarchical_config/rebar.config
similarity index 100%
rename from test_projects/hierarchical_config/rebar.config
rename to test/test_projects/hierarchical_config/rebar.config
diff --git a/test/test_projects/in_place_tests/.elp.toml b/test/test_projects/in_place_tests/.elp.toml
new file mode 100644
index 0000000000..70edcc3f03
--- /dev/null
+++ b/test/test_projects/in_place_tests/.elp.toml
@@ -0,0 +1,5 @@
+[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
new file mode 100644
index 0000000000..f4f354e7ee
--- /dev/null
+++ b/test/test_projects/in_place_tests/BUCK
@@ -0,0 +1,19 @@
+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_projects/in_place_tests/README.md b/test/test_projects/in_place_tests/README.md
similarity index 100%
rename from test_projects/in_place_tests/README.md
rename to test/test_projects/in_place_tests/README.md
diff --git a/test_projects/in_place_tests/app_a/extra/app_a.erl b/test/test_projects/in_place_tests/app_a/extra/app_a.erl
similarity index 100%
rename from test_projects/in_place_tests/app_a/extra/app_a.erl
rename to test/test_projects/in_place_tests/app_a/extra/app_a.erl
diff --git a/test_projects/in_place_tests/app_a/include/app_a.hrl b/test/test_projects/in_place_tests/app_a/include/app_a.hrl
similarity index 100%
rename from test_projects/in_place_tests/app_a/include/app_a.hrl
rename to test/test_projects/in_place_tests/app_a/include/app_a.hrl
diff --git a/test_projects/in_place_tests/app_a/include/broken_diagnostics.hrl b/test/test_projects/in_place_tests/app_a/include/broken_diagnostics.hrl
similarity index 100%
rename from test_projects/in_place_tests/app_a/include/broken_diagnostics.hrl
rename to test/test_projects/in_place_tests/app_a/include/broken_diagnostics.hrl
diff --git a/test_projects/in_place_tests/app_a/include/diagnostics.hrl b/test/test_projects/in_place_tests/app_a/include/diagnostics.hrl
similarity index 100%
rename from test_projects/in_place_tests/app_a/include/diagnostics.hrl
rename to test/test_projects/in_place_tests/app_a/include/diagnostics.hrl
diff --git a/test_projects/in_place_tests/app_a/src/app_a.app.src b/test/test_projects/in_place_tests/app_a/src/app_a.app.src
similarity index 100%
rename from test_projects/in_place_tests/app_a/src/app_a.app.src
rename to test/test_projects/in_place_tests/app_a/src/app_a.app.src
diff --git a/test_projects/in_place_tests/app_a/src/app_a.erl b/test/test_projects/in_place_tests/app_a/src/app_a.erl
similarity index 100%
rename from test_projects/in_place_tests/app_a/src/app_a.erl
rename to test/test_projects/in_place_tests/app_a/src/app_a.erl
diff --git a/test_projects/in_place_tests/app_a/src/lints.erl b/test/test_projects/in_place_tests/app_a/src/lints.erl
similarity index 100%
rename from test_projects/in_place_tests/app_a/src/lints.erl
rename to test/test_projects/in_place_tests/app_a/src/lints.erl
diff --git a/test_projects/in_place_tests/app_a/test/app_a_SUITE.erl b/test/test_projects/in_place_tests/app_a/test/app_a_SUITE.erl
similarity index 100%
rename from test_projects/in_place_tests/app_a/test/app_a_SUITE.erl
rename to test/test_projects/in_place_tests/app_a/test/app_a_SUITE.erl
diff --git a/test_projects/in_place_tests/erlang_ls.config b/test/test_projects/in_place_tests/erlang_ls.config
similarity index 100%
rename from test_projects/in_place_tests/erlang_ls.config
rename to test/test_projects/in_place_tests/erlang_ls.config
diff --git a/test_projects/in_place_tests/rebar.config b/test/test_projects/in_place_tests/rebar.config
similarity index 100%
rename from test_projects/in_place_tests/rebar.config
rename to test/test_projects/in_place_tests/rebar.config
diff --git a/test/test_projects/include_lib_dependency_test/.elp.toml b/test/test_projects/include_lib_dependency_test/.elp.toml
new file mode 100644
index 0000000000..9d1c859339
--- /dev/null
+++ b/test/test_projects/include_lib_dependency_test/.elp.toml
@@ -0,0 +1,5 @@
+[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
new file mode 100644
index 0000000000..54b81c47b5
--- /dev/null
+++ b/test/test_projects/include_lib_dependency_test/BUCK
@@ -0,0 +1,43 @@
+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_projects/include_lib_dependency_test/external_app/include/external_header.hrl b/test/test_projects/include_lib_dependency_test/external_app/include/external_header.hrl
similarity index 100%
rename from test_projects/include_lib_dependency_test/external_app/include/external_header.hrl
rename to test/test_projects/include_lib_dependency_test/external_app/include/external_header.hrl
diff --git a/test_projects/include_lib_dependency_test/external_app/src/external_app.app.src b/test/test_projects/include_lib_dependency_test/external_app/src/external_app.app.src
similarity index 100%
rename from test_projects/include_lib_dependency_test/external_app/src/external_app.app.src
rename to test/test_projects/include_lib_dependency_test/external_app/src/external_app.app.src
diff --git a/test_projects/include_lib_dependency_test/external_app/src/external_app.erl b/test/test_projects/include_lib_dependency_test/external_app/src/external_app.erl
similarity index 100%
rename from test_projects/include_lib_dependency_test/external_app/src/external_app.erl
rename to test/test_projects/include_lib_dependency_test/external_app/src/external_app.erl
diff --git a/test_projects/include_lib_dependency_test/extra_app/include/extra_header.hrl b/test/test_projects/include_lib_dependency_test/extra_app/include/extra_header.hrl
similarity index 100%
rename from test_projects/include_lib_dependency_test/extra_app/include/extra_header.hrl
rename to test/test_projects/include_lib_dependency_test/extra_app/include/extra_header.hrl
diff --git a/test_projects/include_lib_dependency_test/extra_app/src/extra_app.app.src b/test/test_projects/include_lib_dependency_test/extra_app/src/extra_app.app.src
similarity index 100%
rename from test_projects/include_lib_dependency_test/extra_app/src/extra_app.app.src
rename to test/test_projects/include_lib_dependency_test/extra_app/src/extra_app.app.src
diff --git a/test_projects/include_lib_dependency_test/extra_app/src/extra_app.erl b/test/test_projects/include_lib_dependency_test/extra_app/src/extra_app.erl
similarity index 100%
rename from test_projects/include_lib_dependency_test/extra_app/src/extra_app.erl
rename to test/test_projects/include_lib_dependency_test/extra_app/src/extra_app.erl
diff --git a/test_projects/include_lib_dependency_test/main_app/src/main_app.app.src b/test/test_projects/include_lib_dependency_test/main_app/src/main_app.app.src
similarity index 100%
rename from test_projects/include_lib_dependency_test/main_app/src/main_app.app.src
rename to test/test_projects/include_lib_dependency_test/main_app/src/main_app.app.src
diff --git a/test_projects/include_lib_dependency_test/main_app/src/main_app.erl b/test/test_projects/include_lib_dependency_test/main_app/src/main_app.erl
similarity index 100%
rename from test_projects/include_lib_dependency_test/main_app/src/main_app.erl
rename to test/test_projects/include_lib_dependency_test/main_app/src/main_app.erl
diff --git a/test_projects/include_lib_dependency_test/normal_dep/include/assert.hrl b/test/test_projects/include_lib_dependency_test/normal_dep/include/assert.hrl
similarity index 100%
rename from test_projects/include_lib_dependency_test/normal_dep/include/assert.hrl
rename to test/test_projects/include_lib_dependency_test/normal_dep/include/assert.hrl
diff --git a/test_projects/include_lib_dependency_test/normal_dep/src/normal_dep.app.src b/test/test_projects/include_lib_dependency_test/normal_dep/src/normal_dep.app.src
similarity index 100%
rename from test_projects/include_lib_dependency_test/normal_dep/src/normal_dep.app.src
rename to test/test_projects/include_lib_dependency_test/normal_dep/src/normal_dep.app.src
diff --git a/test_projects/include_lib_dependency_test/normal_dep/src/normal_dep.erl b/test/test_projects/include_lib_dependency_test/normal_dep/src/normal_dep.erl
similarity index 100%
rename from test_projects/include_lib_dependency_test/normal_dep/src/normal_dep.erl
rename to test/test_projects/include_lib_dependency_test/normal_dep/src/normal_dep.erl
diff --git a/test_projects/include_lib_dependency_test/rebar.config b/test/test_projects/include_lib_dependency_test/rebar.config
similarity index 100%
rename from test_projects/include_lib_dependency_test/rebar.config
rename to test/test_projects/include_lib_dependency_test/rebar.config
diff --git a/test/test_projects/linter/.elp.toml b/test/test_projects/linter/.elp.toml
new file mode 100644
index 0000000000..4820625b2d
--- /dev/null
+++ b/test/test_projects/linter/.elp.toml
@@ -0,0 +1,5 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "root//linter/..." ]
+source_root = "linter"
diff --git a/test_projects/linter/.elp_lint.toml b/test/test_projects/linter/.elp_lint.toml
similarity index 100%
rename from test_projects/linter/.elp_lint.toml
rename to test/test_projects/linter/.elp_lint.toml
diff --git a/test_projects/linter/.gitignore b/test/test_projects/linter/.gitignore
similarity index 100%
rename from test_projects/linter/.gitignore
rename to test/test_projects/linter/.gitignore
diff --git a/test/test_projects/linter/BUCK b/test/test_projects/linter/BUCK
new file mode 100644
index 0000000000..2db8750582
--- /dev/null
+++ b/test/test_projects/linter/BUCK
@@ -0,0 +1,41 @@
+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_projects/linter/app_a/include/app_a.hrl b/test/test_projects/linter/app_a/include/app_a.hrl
similarity index 100%
rename from test_projects/linter/app_a/include/app_a.hrl
rename to test/test_projects/linter/app_a/include/app_a.hrl
diff --git a/test_projects/linter/app_a/src/app_a.app.src b/test/test_projects/linter/app_a/src/app_a.app.src
similarity index 100%
rename from test_projects/linter/app_a/src/app_a.app.src
rename to test/test_projects/linter/app_a/src/app_a.app.src
diff --git a/test_projects/linter/app_a/src/app_a.erl b/test/test_projects/linter/app_a/src/app_a.erl
similarity index 100%
rename from test_projects/linter/app_a/src/app_a.erl
rename to test/test_projects/linter/app_a/src/app_a.erl
diff --git a/test_projects/linter/app_a/src/app_a_edoc.erl b/test/test_projects/linter/app_a/src/app_a_edoc.erl
similarity index 100%
rename from test_projects/linter/app_a/src/app_a_edoc.erl
rename to test/test_projects/linter/app_a/src/app_a_edoc.erl
diff --git a/test_projects/linter/app_a/src/app_a_ssr.erl b/test/test_projects/linter/app_a/src/app_a_ssr.erl
similarity index 100%
rename from test_projects/linter/app_a/src/app_a_ssr.erl
rename to test/test_projects/linter/app_a/src/app_a_ssr.erl
diff --git a/test_projects/linter/app_a/src/app_a_unused_param.erl b/test/test_projects/linter/app_a/src/app_a_unused_param.erl
similarity index 100%
rename from test_projects/linter/app_a/src/app_a_unused_param.erl
rename to test/test_projects/linter/app_a/src/app_a_unused_param.erl
diff --git a/test_projects/linter/app_a/src/custom_function_matches.erl b/test/test_projects/linter/app_a/src/custom_function_matches.erl
similarity index 100%
rename from test_projects/linter/app_a/src/custom_function_matches.erl
rename to test/test_projects/linter/app_a/src/custom_function_matches.erl
diff --git a/test_projects/linter/app_a/src/expression_updates_literal.erl b/test/test_projects/linter/app_a/src/expression_updates_literal.erl
similarity index 100%
rename from test_projects/linter/app_a/src/expression_updates_literal.erl
rename to test/test_projects/linter/app_a/src/expression_updates_literal.erl
diff --git a/test_projects/linter/app_a/src/spelling.erl b/test/test_projects/linter/app_a/src/spelling.erl
similarity index 100%
rename from test_projects/linter/app_a/src/spelling.erl
rename to test/test_projects/linter/app_a/src/spelling.erl
diff --git a/test_projects/linter/app_a/test/app_a_SUITE.erl b/test/test_projects/linter/app_a/test/app_a_SUITE.erl
similarity index 100%
rename from test_projects/linter/app_a/test/app_a_SUITE.erl
rename to test/test_projects/linter/app_a/test/app_a_SUITE.erl
diff --git a/test_projects/linter/app_a/test/app_a_test_helpers.erl b/test/test_projects/linter/app_a/test/app_a_test_helpers.erl
similarity index 100%
rename from test_projects/linter/app_a/test/app_a_test_helpers.erl
rename to test/test_projects/linter/app_a/test/app_a_test_helpers.erl
diff --git a/test_projects/linter/app_a/test/app_a_test_helpers_not_opted_in.erl b/test/test_projects/linter/app_a/test/app_a_test_helpers_not_opted_in.erl
similarity index 100%
rename from test_projects/linter/app_a/test/app_a_test_helpers_not_opted_in.erl
rename to test/test_projects/linter/app_a/test/app_a_test_helpers_not_opted_in.erl
diff --git a/test_projects/linter/app_a/test/app_a_unreachable_test_SUITE.erl b/test/test_projects/linter/app_a/test/app_a_unreachable_test_SUITE.erl
similarity index 100%
rename from test_projects/linter/app_a/test/app_a_unreachable_test_SUITE.erl
rename to test/test_projects/linter/app_a/test/app_a_unreachable_test_SUITE.erl
diff --git a/test_projects/linter/app_a/test/app_test_helpers_no_errors.erl b/test/test_projects/linter/app_a/test/app_test_helpers_no_errors.erl
similarity index 100%
rename from test_projects/linter/app_a/test/app_test_helpers_no_errors.erl
rename to test/test_projects/linter/app_a/test/app_test_helpers_no_errors.erl
diff --git a/test_projects/linter/app_b/src/app_b.app.src b/test/test_projects/linter/app_b/src/app_b.app.src
similarity index 100%
rename from test_projects/linter/app_b/src/app_b.app.src
rename to test/test_projects/linter/app_b/src/app_b.app.src
diff --git a/test_projects/linter/app_b/src/app_b.erl b/test/test_projects/linter/app_b/src/app_b.erl
similarity index 100%
rename from test_projects/linter/app_b/src/app_b.erl
rename to test/test_projects/linter/app_b/src/app_b.erl
diff --git a/test_projects/linter/app_b/src/app_b_unused_param.erl b/test/test_projects/linter/app_b/src/app_b_unused_param.erl
similarity index 100%
rename from test_projects/linter/app_b/src/app_b_unused_param.erl
rename to test/test_projects/linter/app_b/src/app_b_unused_param.erl
diff --git a/test_projects/linter/elp_lint_adhoc.toml b/test/test_projects/linter/elp_lint_adhoc.toml
similarity index 100%
rename from test_projects/linter/elp_lint_adhoc.toml
rename to test/test_projects/linter/elp_lint_adhoc.toml
diff --git a/test_projects/linter/elp_lint_custom_function_matches.toml b/test/test_projects/linter/elp_lint_custom_function_matches.toml
similarity index 100%
rename from test_projects/linter/elp_lint_custom_function_matches.toml
rename to test/test_projects/linter/elp_lint_custom_function_matches.toml
diff --git a/test_projects/linter/elp_lint_ssr_adhoc.toml b/test/test_projects/linter/elp_lint_ssr_adhoc.toml
similarity index 100%
rename from test_projects/linter/elp_lint_ssr_adhoc.toml
rename to test/test_projects/linter/elp_lint_ssr_adhoc.toml
diff --git a/test_projects/linter/elp_lint_ssr_adhoc_parse_fail.toml b/test/test_projects/linter/elp_lint_ssr_adhoc_parse_fail.toml
similarity index 100%
rename from test_projects/linter/elp_lint_ssr_adhoc_parse_fail.toml
rename to test/test_projects/linter/elp_lint_ssr_adhoc_parse_fail.toml
diff --git a/test_projects/linter/elp_lint_test1.toml b/test/test_projects/linter/elp_lint_test1.toml
similarity index 100%
rename from test_projects/linter/elp_lint_test1.toml
rename to test/test_projects/linter/elp_lint_test1.toml
diff --git a/test_projects/linter/elp_lint_test2.toml b/test/test_projects/linter/elp_lint_test2.toml
similarity index 100%
rename from test_projects/linter/elp_lint_test2.toml
rename to test/test_projects/linter/elp_lint_test2.toml
diff --git a/test_projects/linter/elp_lint_test_ignore.toml b/test/test_projects/linter/elp_lint_test_ignore.toml
similarity index 100%
rename from test_projects/linter/elp_lint_test_ignore.toml
rename to test/test_projects/linter/elp_lint_test_ignore.toml
diff --git a/test_projects/linter/elp_lint_warnings_as_errors.toml b/test/test_projects/linter/elp_lint_warnings_as_errors.toml
similarity index 100%
rename from test_projects/linter/elp_lint_warnings_as_errors.toml
rename to test/test_projects/linter/elp_lint_warnings_as_errors.toml
diff --git a/test_projects/linter/rebar.config b/test/test_projects/linter/rebar.config
similarity index 100%
rename from test_projects/linter/rebar.config
rename to test/test_projects/linter/rebar.config
diff --git a/test/test_projects/linter_bad_config/.elp.toml b/test/test_projects/linter_bad_config/.elp.toml
new file mode 100644
index 0000000000..4820625b2d
--- /dev/null
+++ b/test/test_projects/linter_bad_config/.elp.toml
@@ -0,0 +1,5 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "root//linter/..." ]
+source_root = "linter"
diff --git a/test_projects/linter_bad_config/.elp_lint.toml b/test/test_projects/linter_bad_config/.elp_lint.toml
similarity index 100%
rename from test_projects/linter_bad_config/.elp_lint.toml
rename to test/test_projects/linter_bad_config/.elp_lint.toml
diff --git a/test_projects/linter_bad_config/.gitignore b/test/test_projects/linter_bad_config/.gitignore
similarity index 100%
rename from test_projects/linter_bad_config/.gitignore
rename to test/test_projects/linter_bad_config/.gitignore
diff --git a/test/test_projects/linter_bad_config/BUCK b/test/test_projects/linter_bad_config/BUCK
new file mode 100644
index 0000000000..a0817a6ad6
--- /dev/null
+++ b/test/test_projects/linter_bad_config/BUCK
@@ -0,0 +1,12 @@
+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_projects/linter_bad_config/app_a/include/app_a.hrl b/test/test_projects/linter_bad_config/app_a/include/app_a.hrl
similarity index 100%
rename from test_projects/linter_bad_config/app_a/include/app_a.hrl
rename to test/test_projects/linter_bad_config/app_a/include/app_a.hrl
diff --git a/test_projects/linter_bad_config/app_a/src/app_a.app.src b/test/test_projects/linter_bad_config/app_a/src/app_a.app.src
similarity index 100%
rename from test_projects/linter_bad_config/app_a/src/app_a.app.src
rename to test/test_projects/linter_bad_config/app_a/src/app_a.app.src
diff --git a/test_projects/linter_bad_config/app_a/src/app_a.erl b/test/test_projects/linter_bad_config/app_a/src/app_a.erl
similarity index 100%
rename from test_projects/linter_bad_config/app_a/src/app_a.erl
rename to test/test_projects/linter_bad_config/app_a/src/app_a.erl
diff --git a/test/test_projects/linter_bad_config/linter/.elp.toml b/test/test_projects/linter_bad_config/linter/.elp.toml
new file mode 100644
index 0000000000..4820625b2d
--- /dev/null
+++ b/test/test_projects/linter_bad_config/linter/.elp.toml
@@ -0,0 +1,5 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "root//linter/..." ]
+source_root = "linter"
diff --git a/test_projects/linter_bad_config/linter/.elp_lint.toml b/test/test_projects/linter_bad_config/linter/.elp_lint.toml
similarity index 100%
rename from test_projects/linter_bad_config/linter/.elp_lint.toml
rename to test/test_projects/linter_bad_config/linter/.elp_lint.toml
diff --git a/test_projects/linter_bad_config/linter/.gitignore b/test/test_projects/linter_bad_config/linter/.gitignore
similarity index 100%
rename from test_projects/linter_bad_config/linter/.gitignore
rename to test/test_projects/linter_bad_config/linter/.gitignore
diff --git a/test/test_projects/linter_bad_config/linter/BUCK b/test/test_projects/linter_bad_config/linter/BUCK
new file mode 100644
index 0000000000..2db8750582
--- /dev/null
+++ b/test/test_projects/linter_bad_config/linter/BUCK
@@ -0,0 +1,41 @@
+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_projects/linter_bad_config/linter/app_a/include/app_a.hrl b/test/test_projects/linter_bad_config/linter/app_a/include/app_a.hrl
similarity index 100%
rename from test_projects/linter_bad_config/linter/app_a/include/app_a.hrl
rename to test/test_projects/linter_bad_config/linter/app_a/include/app_a.hrl
diff --git a/test_projects/linter_bad_config/linter/app_a/src/app_a.app.src b/test/test_projects/linter_bad_config/linter/app_a/src/app_a.app.src
similarity index 100%
rename from test_projects/linter_bad_config/linter/app_a/src/app_a.app.src
rename to test/test_projects/linter_bad_config/linter/app_a/src/app_a.app.src
diff --git a/test_projects/linter_bad_config/linter/app_a/src/app_a.erl b/test/test_projects/linter_bad_config/linter/app_a/src/app_a.erl
similarity index 100%
rename from test_projects/linter_bad_config/linter/app_a/src/app_a.erl
rename to test/test_projects/linter_bad_config/linter/app_a/src/app_a.erl
diff --git a/test_projects/linter_bad_config/linter/app_a/src/app_a_unused_param.erl b/test/test_projects/linter_bad_config/linter/app_a/src/app_a_unused_param.erl
similarity index 100%
rename from test_projects/linter_bad_config/linter/app_a/src/app_a_unused_param.erl
rename to test/test_projects/linter_bad_config/linter/app_a/src/app_a_unused_param.erl
diff --git a/test_projects/linter_bad_config/linter/app_a/test/app_a_SUITE.erl b/test/test_projects/linter_bad_config/linter/app_a/test/app_a_SUITE.erl
similarity index 100%
rename from test_projects/linter_bad_config/linter/app_a/test/app_a_SUITE.erl
rename to test/test_projects/linter_bad_config/linter/app_a/test/app_a_SUITE.erl
diff --git a/test_projects/linter_bad_config/linter/app_a/test/app_a_test_helpers.erl b/test/test_projects/linter_bad_config/linter/app_a/test/app_a_test_helpers.erl
similarity index 100%
rename from test_projects/linter_bad_config/linter/app_a/test/app_a_test_helpers.erl
rename to test/test_projects/linter_bad_config/linter/app_a/test/app_a_test_helpers.erl
diff --git a/test_projects/linter_bad_config/linter/app_a/test/app_a_test_helpers_not_opted_in.erl b/test/test_projects/linter_bad_config/linter/app_a/test/app_a_test_helpers_not_opted_in.erl
similarity index 100%
rename from test_projects/linter_bad_config/linter/app_a/test/app_a_test_helpers_not_opted_in.erl
rename to test/test_projects/linter_bad_config/linter/app_a/test/app_a_test_helpers_not_opted_in.erl
diff --git a/test_projects/linter_bad_config/linter/app_a/test/app_test_helpers_no_errors.erl b/test/test_projects/linter_bad_config/linter/app_a/test/app_test_helpers_no_errors.erl
similarity index 100%
rename from test_projects/linter_bad_config/linter/app_a/test/app_test_helpers_no_errors.erl
rename to test/test_projects/linter_bad_config/linter/app_a/test/app_test_helpers_no_errors.erl
diff --git a/test_projects/linter_bad_config/linter/app_b/src/app_b.app.src b/test/test_projects/linter_bad_config/linter/app_b/src/app_b.app.src
similarity index 100%
rename from test_projects/linter_bad_config/linter/app_b/src/app_b.app.src
rename to test/test_projects/linter_bad_config/linter/app_b/src/app_b.app.src
diff --git a/test_projects/linter_bad_config/linter/app_b/src/app_b.erl b/test/test_projects/linter_bad_config/linter/app_b/src/app_b.erl
similarity index 100%
rename from test_projects/linter_bad_config/linter/app_b/src/app_b.erl
rename to test/test_projects/linter_bad_config/linter/app_b/src/app_b.erl
diff --git a/test_projects/linter_bad_config/linter/app_b/src/app_b_unused_param.erl b/test/test_projects/linter_bad_config/linter/app_b/src/app_b_unused_param.erl
similarity index 100%
rename from test_projects/linter_bad_config/linter/app_b/src/app_b_unused_param.erl
rename to test/test_projects/linter_bad_config/linter/app_b/src/app_b_unused_param.erl
diff --git a/test_projects/linter_bad_config/linter/rebar.config b/test/test_projects/linter_bad_config/linter/rebar.config
similarity index 100%
rename from test_projects/linter_bad_config/linter/rebar.config
rename to test/test_projects/linter_bad_config/linter/rebar.config
diff --git a/test_projects/linter_bad_config/rebar.config b/test/test_projects/linter_bad_config/rebar.config
similarity index 100%
rename from test_projects/linter_bad_config/rebar.config
rename to test/test_projects/linter_bad_config/rebar.config
diff --git a/test/test_projects/linter_config/.elp.toml b/test/test_projects/linter_config/.elp.toml
new file mode 100644
index 0000000000..c490cc155e
--- /dev/null
+++ b/test/test_projects/linter_config/.elp.toml
@@ -0,0 +1,5 @@
+[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
new file mode 100644
index 0000000000..47886dd507
--- /dev/null
+++ b/test/test_projects/linter_config/.elp_lint.toml
@@ -0,0 +1,5 @@
+[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
new file mode 100644
index 0000000000..c1101daea2
--- /dev/null
+++ b/test/test_projects/linter_config/BUCK
@@ -0,0 +1,25 @@
+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_projects/standard/app_a/src/app_a.app.src b/test/test_projects/linter_config/app_a/src/app_a.app.src
similarity index 100%
rename from test_projects/standard/app_a/src/app_a.app.src
rename to test/test_projects/linter_config/app_a/src/app_a.app.src
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
new file mode 100644
index 0000000000..c374c0b518
--- /dev/null
+++ b/test/test_projects/linter_config/app_a/src/app_a.erl
@@ -0,0 +1,4 @@
+-module(app_a).
+
+-define(MACRO_A, a).
+-record(rec_a, {a :: atom()}).
diff --git a/test_projects/standard/app_b/src/app_b.app.src b/test/test_projects/linter_config/app_b/src/app_b.app.src
similarity index 100%
rename from test_projects/standard/app_b/src/app_b.app.src
rename to test/test_projects/linter_config/app_b/src/app_b.app.src
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
new file mode 100644
index 0000000000..ca7ecf985b
--- /dev/null
+++ b/test/test_projects/linter_config/app_b/src/app_b.erl
@@ -0,0 +1,4 @@
+-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
new file mode 100644
index 0000000000..c278bbce23
--- /dev/null
+++ b/test/test_projects/linter_config/app_c/src/app_c.app.src
@@ -0,0 +1,3 @@
+{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
new file mode 100644
index 0000000000..57573554b6
--- /dev/null
+++ b/test/test_projects/linter_config/app_c/src/app_c.erl
@@ -0,0 +1,4 @@
+-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
new file mode 100644
index 0000000000..d508bd24de
--- /dev/null
+++ b/test/test_projects/linter_config/rebar.config
@@ -0,0 +1,9 @@
+{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
new file mode 100644
index 0000000000..1a06a42f0d
--- /dev/null
+++ b/test/test_projects/parse_error/.elp.toml
@@ -0,0 +1,8 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "root//parse_error/..." ]
+source_root = "parse_error"
+
+[eqwalizer]
+enable_all = false
diff --git a/test_projects/parse_error/.gitignore b/test/test_projects/parse_error/.gitignore
similarity index 100%
rename from test_projects/parse_error/.gitignore
rename to test/test_projects/parse_error/.gitignore
diff --git a/test_projects/parse_error/.rebar.root b/test/test_projects/parse_error/.rebar.root
similarity index 100%
rename from test_projects/parse_error/.rebar.root
rename to test/test_projects/parse_error/.rebar.root
diff --git a/test/test_projects/parse_error/BUCK b/test/test_projects/parse_error/BUCK
new file mode 100644
index 0000000000..ed65c267d0
--- /dev/null
+++ b/test/test_projects/parse_error/BUCK
@@ -0,0 +1,9 @@
+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_projects/parse_error/eqwalizer/src/eqwalizer.app.src b/test/test_projects/parse_error/eqwalizer/src/eqwalizer.app.src
similarity index 100%
rename from test_projects/parse_error/eqwalizer/src/eqwalizer.app.src
rename to test/test_projects/parse_error/eqwalizer/src/eqwalizer.app.src
diff --git a/test_projects/parse_error/eqwalizer/src/eqwalizer.erl b/test/test_projects/parse_error/eqwalizer/src/eqwalizer.erl
similarity index 100%
rename from test_projects/parse_error/eqwalizer/src/eqwalizer.erl
rename to test/test_projects/parse_error/eqwalizer/src/eqwalizer.erl
diff --git a/test_projects/parse_error/eqwalizer/src/eqwalizer_specs.erl b/test/test_projects/parse_error/eqwalizer/src/eqwalizer_specs.erl
similarity index 100%
rename from test_projects/parse_error/eqwalizer/src/eqwalizer_specs.erl
rename to test/test_projects/parse_error/eqwalizer/src/eqwalizer_specs.erl
diff --git a/test_projects/parse_error/parse_error_a/src/parse_error_a.app.src b/test/test_projects/parse_error/parse_error_a/src/parse_error_a.app.src
similarity index 100%
rename from test_projects/parse_error/parse_error_a/src/parse_error_a.app.src
rename to test/test_projects/parse_error/parse_error_a/src/parse_error_a.app.src
diff --git a/test_projects/parse_error/parse_error_a/src/parse_error_a.erl b/test/test_projects/parse_error/parse_error_a/src/parse_error_a.erl
similarity index 100%
rename from test_projects/parse_error/parse_error_a/src/parse_error_a.erl
rename to test/test_projects/parse_error/parse_error_a/src/parse_error_a.erl
diff --git a/test_projects/parse_error/parse_error_a/src/parse_error_a_bad.erl b/test/test_projects/parse_error/parse_error_a/src/parse_error_a_bad.erl
similarity index 100%
rename from test_projects/parse_error/parse_error_a/src/parse_error_a_bad.erl
rename to test/test_projects/parse_error/parse_error_a/src/parse_error_a_bad.erl
diff --git a/test_projects/parse_error/parse_error_a/src/parse_error_a_reference_bad.erl b/test/test_projects/parse_error/parse_error_a/src/parse_error_a_reference_bad.erl
similarity index 100%
rename from test_projects/parse_error/parse_error_a/src/parse_error_a_reference_bad.erl
rename to test/test_projects/parse_error/parse_error_a/src/parse_error_a_reference_bad.erl
diff --git a/test_projects/parse_error/parse_error_a/src/parse_error_a_syntax_error.erl b/test/test_projects/parse_error/parse_error_a/src/parse_error_a_syntax_error.erl
similarity index 100%
rename from test_projects/parse_error/parse_error_a/src/parse_error_a_syntax_error.erl
rename to test/test_projects/parse_error/parse_error_a/src/parse_error_a_syntax_error.erl
diff --git a/test_projects/parse_error/parse_error_a/src/parse_error_a_worst.erl b/test/test_projects/parse_error/parse_error_a/src/parse_error_a_worst.erl
similarity index 100%
rename from test_projects/parse_error/parse_error_a/src/parse_error_a_worst.erl
rename to test/test_projects/parse_error/parse_error_a/src/parse_error_a_worst.erl
diff --git a/test_projects/parse_error/rebar.config b/test/test_projects/parse_error/rebar.config
similarity index 100%
rename from test_projects/parse_error/rebar.config
rename to test/test_projects/parse_error/rebar.config
diff --git a/test/test_projects/standard/.elp.toml b/test/test_projects/standard/.elp.toml
new file mode 100644
index 0000000000..f5e2ac1943
--- /dev/null
+++ b/test/test_projects/standard/.elp.toml
@@ -0,0 +1,5 @@
+[buck]
+enabled = true
+build_deps = false
+included_targets = [ "root//standard/..." ]
+source_root = "standard"
diff --git a/test_projects/standard/.gitignore b/test/test_projects/standard/.gitignore
similarity index 100%
rename from test_projects/standard/.gitignore
rename to test/test_projects/standard/.gitignore
diff --git a/test_projects/standard/.rebar.root b/test/test_projects/standard/.rebar.root
similarity index 100%
rename from test_projects/standard/.rebar.root
rename to test/test_projects/standard/.rebar.root
diff --git a/test/test_projects/standard/BUCK b/test/test_projects/standard/BUCK
new file mode 100644
index 0000000000..3f1e9ee947
--- /dev/null
+++ b/test/test_projects/standard/BUCK
@@ -0,0 +1,49 @@
+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/.eqwalizer b/test/test_projects/standard/app_a/.eqwalizer
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/test_projects/standard/app_a/extra/app_a.erl b/test/test_projects/standard/app_a/extra/app_a.erl
similarity index 100%
rename from test_projects/standard/app_a/extra/app_a.erl
rename to test/test_projects/standard/app_a/extra/app_a.erl
diff --git a/test_projects/standard/app_a/include/app_a.hrl b/test/test_projects/standard/app_a/include/app_a.hrl
similarity index 100%
rename from test_projects/standard/app_a/include/app_a.hrl
rename to test/test_projects/standard/app_a/include/app_a.hrl
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
new file mode 100644
index 0000000000..1381435a46
--- /dev/null
+++ b/test/test_projects/standard/app_a/src/app_a.app.src
@@ -0,0 +1,3 @@
+{application, app_a,
+  [{description, "example app A"}, {vsn, "inplace"}, {applications, [kernel, stdlib]}]
+}.
diff --git a/test_projects/standard/app_a/src/app_a.erl b/test/test_projects/standard/app_a/src/app_a.erl
similarity index 100%
rename from test_projects/standard/app_a/src/app_a.erl
rename to test/test_projects/standard/app_a/src/app_a.erl
diff --git a/test_projects/standard/app_a/src/app_a_errors_generated.erl b/test/test_projects/standard/app_a/src/app_a_errors_generated.erl
similarity index 100%
rename from test_projects/standard/app_a/src/app_a_errors_generated.erl
rename to test/test_projects/standard/app_a/src/app_a_errors_generated.erl
diff --git a/test_projects/standard/app_a/src/app_a_fixme.erl b/test/test_projects/standard/app_a/src/app_a_fixme.erl
similarity index 100%
rename from test_projects/standard/app_a/src/app_a_fixme.erl
rename to test/test_projects/standard/app_a/src/app_a_fixme.erl
diff --git a/test_projects/standard/app_a/src/app_a_ignored.erl b/test/test_projects/standard/app_a/src/app_a_ignored.erl
similarity index 100%
rename from test_projects/standard/app_a/src/app_a_ignored.erl
rename to test/test_projects/standard/app_a/src/app_a_ignored.erl
diff --git a/test_projects/standard/app_a/src/app_a_lists.erl b/test/test_projects/standard/app_a/src/app_a_lists.erl
similarity index 100%
rename from test_projects/standard/app_a/src/app_a_lists.erl
rename to test/test_projects/standard/app_a/src/app_a_lists.erl
diff --git a/test_projects/standard/app_a/src/app_a_mod2.erl b/test/test_projects/standard/app_a/src/app_a_mod2.erl
similarity index 100%
rename from test_projects/standard/app_a/src/app_a_mod2.erl
rename to test/test_projects/standard/app_a/src/app_a_mod2.erl
diff --git a/test_projects/standard/app_a/src/app_a_no_errors.erl b/test/test_projects/standard/app_a/src/app_a_no_errors.erl
similarity index 100%
rename from test_projects/standard/app_a/src/app_a_no_errors.erl
rename to test/test_projects/standard/app_a/src/app_a_no_errors.erl
diff --git a/test_projects/standard/app_a/src/app_a_no_errors_generated.erl b/test/test_projects/standard/app_a/src/app_a_no_errors_generated.erl
similarity index 100%
rename from test_projects/standard/app_a/src/app_a_no_errors_generated.erl
rename to test/test_projects/standard/app_a/src/app_a_no_errors_generated.erl
diff --git a/test_projects/standard/app_a/src/app_a_no_errors_opted_in.erl b/test/test_projects/standard/app_a/src/app_a_no_errors_opted_in.erl
similarity index 100%
rename from test_projects/standard/app_a/src/app_a_no_errors_opted_in.erl
rename to test/test_projects/standard/app_a/src/app_a_no_errors_opted_in.erl
diff --git a/test_projects/standard/app_a/test/app_a_SUITE.erl b/test/test_projects/standard/app_a/test/app_a_SUITE.erl
similarity index 100%
rename from test_projects/standard/app_a/test/app_a_SUITE.erl
rename to test/test_projects/standard/app_a/test/app_a_SUITE.erl
diff --git a/test_projects/standard/app_a/test/app_a_test_helpers.erl b/test/test_projects/standard/app_a/test/app_a_test_helpers.erl
similarity index 100%
rename from test_projects/standard/app_a/test/app_a_test_helpers.erl
rename to test/test_projects/standard/app_a/test/app_a_test_helpers.erl
diff --git a/test_projects/standard/app_a/test/app_a_test_helpers_not_opted_in.erl b/test/test_projects/standard/app_a/test/app_a_test_helpers_not_opted_in.erl
similarity index 100%
rename from test_projects/standard/app_a/test/app_a_test_helpers_not_opted_in.erl
rename to test/test_projects/standard/app_a/test/app_a_test_helpers_not_opted_in.erl
diff --git a/test_projects/standard/app_a/test/app_test_helpers_no_errors.erl b/test/test_projects/standard/app_a/test/app_test_helpers_no_errors.erl
similarity index 100%
rename from test_projects/standard/app_a/test/app_test_helpers_no_errors.erl
rename to test/test_projects/standard/app_a/test/app_test_helpers_no_errors.erl
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
new file mode 100644
index 0000000000..4112b4129f
--- /dev/null
+++ b/test/test_projects/standard/app_b/src/app_b.app.src
@@ -0,0 +1,3 @@
+{application, app_b,
+  [{description, "example app B"}, {vsn, "inplace"}, {applications, [kernel, stdlib]}]
+}.
diff --git a/test_projects/standard/app_b/src/app_b.erl b/test/test_projects/standard/app_b/src/app_b.erl
similarity index 100%
rename from test_projects/standard/app_b/src/app_b.erl
rename to test/test_projects/standard/app_b/src/app_b.erl
diff --git a/test_projects/standard/eqwalizer/src/eqwalizer.app.src b/test/test_projects/standard/eqwalizer/src/eqwalizer.app.src
similarity index 100%
rename from test_projects/standard/eqwalizer/src/eqwalizer.app.src
rename to test/test_projects/standard/eqwalizer/src/eqwalizer.app.src
diff --git a/test_projects/standard/eqwalizer/src/eqwalizer.erl b/test/test_projects/standard/eqwalizer/src/eqwalizer.erl
similarity index 100%
rename from test_projects/standard/eqwalizer/src/eqwalizer.erl
rename to test/test_projects/standard/eqwalizer/src/eqwalizer.erl
diff --git a/test_projects/standard/eqwalizer/src/eqwalizer_specs.erl b/test/test_projects/standard/eqwalizer/src/eqwalizer_specs.erl
similarity index 100%
rename from test_projects/standard/eqwalizer/src/eqwalizer_specs.erl
rename to test/test_projects/standard/eqwalizer/src/eqwalizer_specs.erl
diff --git a/test_projects/standard/erlang_ls.config b/test/test_projects/standard/erlang_ls.config
similarity index 100%
rename from test_projects/standard/erlang_ls.config
rename to test/test_projects/standard/erlang_ls.config
diff --git a/test_projects/standard/rebar.config b/test/test_projects/standard/rebar.config
similarity index 100%
rename from test_projects/standard/rebar.config
rename to test/test_projects/standard/rebar.config
diff --git a/test/test_projects/toolchains/BUCK b/test/test_projects/toolchains/BUCK
new file mode 100644
index 0000000000..770ac61f67
--- /dev/null
+++ b/test/test_projects/toolchains/BUCK
@@ -0,0 +1,5 @@
+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
new file mode 100644
index 0000000000..87c2f17334
--- /dev/null
+++ b/test/test_projects/xref/.elp.toml
@@ -0,0 +1,5 @@
+[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
new file mode 100644
index 0000000000..bf44968f02
--- /dev/null
+++ b/test/test_projects/xref/BUCK
@@ -0,0 +1,25 @@
+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_projects/xref/app_a/src/unavailable_type.erl b/test/test_projects/xref/app_a/src/unavailable_type.erl
similarity index 100%
rename from test_projects/xref/app_a/src/unavailable_type.erl
rename to test/test_projects/xref/app_a/src/unavailable_type.erl
diff --git a/test_projects/xref/app_b/src/app_b.erl b/test/test_projects/xref/app_b/src/app_b.erl
similarity index 100%
rename from test_projects/xref/app_b/src/app_b.erl
rename to test/test_projects/xref/app_b/src/app_b.erl
diff --git a/test_projects/xref/app_c/src/app_c.erl b/test/test_projects/xref/app_c/src/app_c.erl
similarity index 100%
rename from test_projects/xref/app_c/src/app_c.erl
rename to test/test_projects/xref/app_c/src/app_c.erl
diff --git a/test_projects/xref/elp_lint_unavailable_type.toml b/test/test_projects/xref/elp_lint_unavailable_type.toml
similarity index 100%
rename from test_projects/xref/elp_lint_unavailable_type.toml
rename to test/test_projects/xref/elp_lint_unavailable_type.toml
diff --git a/test_projects/buck_bad_config/.elp.toml b/test_projects/buck_bad_config/.elp.toml
deleted file mode 100644
index a891a3dfc5..0000000000
--- a/test_projects/buck_bad_config/.elp.toml
+++ /dev/null
@@ -1,8 +0,0 @@
-[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_projects/buck_tests/.elp.toml b/test_projects/buck_tests/.elp.toml
deleted file mode 100644
index acb0799975..0000000000
--- a/test_projects/buck_tests/.elp.toml
+++ /dev/null
@@ -1,9 +0,0 @@
-[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_projects/buck_tests_2/.elp.toml b/test_projects/buck_tests_2/.elp.toml
deleted file mode 100644
index 35f02a72f3..0000000000
--- a/test_projects/buck_tests_2/.elp.toml
+++ /dev/null
@@ -1,12 +0,0 @@
-[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_projects/diagnostics/.elp.toml b/test_projects/diagnostics/.elp.toml
deleted file mode 100644
index e5ee70c992..0000000000
--- a/test_projects/diagnostics/.elp.toml
+++ /dev/null
@@ -1,8 +0,0 @@
-[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_projects/eqwalizer_callers/.elp.toml b/test_projects/eqwalizer_callers/.elp.toml
deleted file mode 100644
index f4b7f6f6ac..0000000000
--- a/test_projects/eqwalizer_callers/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[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_projects/eqwalizer_tests/.elp.toml b/test_projects/eqwalizer_tests/.elp.toml
deleted file mode 100644
index ed5c60502f..0000000000
--- a/test_projects/eqwalizer_tests/.elp.toml
+++ /dev/null
@@ -1,8 +0,0 @@
-[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_projects/hierarchical_config/.elp.toml b/test_projects/hierarchical_config/.elp.toml
deleted file mode 100644
index 1033c181ee..0000000000
--- a/test_projects/hierarchical_config/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[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_projects/in_place_tests/.elp.toml b/test_projects/in_place_tests/.elp.toml
deleted file mode 100644
index b6c251f03c..0000000000
--- a/test_projects/in_place_tests/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[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_projects/include_lib_dependency_test/.elp.toml b/test_projects/include_lib_dependency_test/.elp.toml
deleted file mode 100644
index 65e106a9e2..0000000000
--- a/test_projects/include_lib_dependency_test/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[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_projects/linter/.elp.toml b/test_projects/linter/.elp.toml
deleted file mode 100644
index a887ab835c..0000000000
--- a/test_projects/linter/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[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_projects/linter_bad_config/.elp.toml b/test_projects/linter_bad_config/.elp.toml
deleted file mode 100644
index a887ab835c..0000000000
--- a/test_projects/linter_bad_config/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[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_projects/linter_bad_config/linter/.elp.toml b/test_projects/linter_bad_config/linter/.elp.toml
deleted file mode 100644
index a887ab835c..0000000000
--- a/test_projects/linter_bad_config/linter/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[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_projects/parse_error/.elp.toml b/test_projects/parse_error/.elp.toml
deleted file mode 100644
index bf2c1ad580..0000000000
--- a/test_projects/parse_error/.elp.toml
+++ /dev/null
@@ -1,8 +0,0 @@
-[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_projects/standard/.elp.toml b/test_projects/standard/.elp.toml
deleted file mode 100644
index 09ff5a4d5a..0000000000
--- a/test_projects/standard/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[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_projects/xref/.elp.toml b/test_projects/xref/.elp.toml
deleted file mode 100644
index afda912287..0000000000
--- a/test_projects/xref/.elp.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[buck]
-enabled = true
-build_deps = false
-included_targets = [ "fbcode//whatsapp/elp/test_projects/xref/..." ]
-source_root = "whatsapp/elp/test_projects/xref"
diff --git a/website/docs/erlang-error-index/w/W0060.md b/website/docs/erlang-error-index/w/W0060.md
new file mode 100644
index 0000000000..91b972dacf
--- /dev/null
+++ b/website/docs/erlang-error-index/w/W0060.md
@@ -0,0 +1,48 @@
+---
+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.