Fix mod item in included file resolving incorrectly

crates/hir-def/src/nameres/mod_resolution.rs

@@ -66,7 +66,7 @@ impl ModDir {
         attr_path: Option<&SmolStr>,
     ) -> Result<(FileId, bool, ModDir), Box<[String]>> {
         let name = name.unescaped();
-        let orig_file_id = file_id.original_file(db.upcast());
+        let orig_file_id = file_id.original_file_respecting_includes(db.upcast());
 
         let mut candidate_files = ArrayVec::<_, 2>::new();
         match attr_path {

crates/hir-expand/src/builtin_fn_macro.rs

@@ -578,18 +578,12 @@ fn include_expand(
     tt: &tt::Subtree,
     span: SpanData,
 ) -> ExpandResult<tt::Subtree> {
-    let path = match parse_string(tt) {
+    let file_id = match include_input_to_file_id(db, arg_id, tt) {
         Ok(it) => it,
         Err(e) => {
             return ExpandResult::new(tt::Subtree::empty(DelimSpan { open: span, close: span }), e)
         }
     };
-    let file_id = match relative_file(db, arg_id, &path, false) {
-        Ok(file_id) => file_id,
-        Err(e) => {
-            return ExpandResult::new(tt::Subtree::empty(DelimSpan { open: span, close: span }), e);
-        }
-    };
     match parse_to_token_tree(
         SpanAnchor { file_id, ast_id: ROOT_ERASED_FILE_AST_ID },
         SyntaxContextId::ROOT,
@@ -603,19 +597,20 @@ fn include_expand(
     }
 }
 
+pub fn include_input_to_file_id(
+    db: &dyn ExpandDatabase,
+    arg_id: MacroCallId,
+    arg: &tt::Subtree,
+) -> Result<FileId, ExpandError> {
+    relative_file(db, arg_id, &parse_string(arg)?, false)
+}
+
 fn include_bytes_expand(
     _db: &dyn ExpandDatabase,
     _arg_id: MacroCallId,
-    tt: &tt::Subtree,
+    _tt: &tt::Subtree,
     span: SpanData,
 ) -> ExpandResult<tt::Subtree> {
-    let _path = match parse_string(tt) {
-        Ok(it) => it,
-        Err(e) => {
-            return ExpandResult::new(tt::Subtree::empty(DelimSpan { open: span, close: span }), e)
-        }
-    };
-
     // FIXME: actually read the file here if the user asked for macro expansion
     let res = tt::Subtree {
         delimiter: tt::Delimiter::dummy_invisible(),

crates/hir-expand/src/lib.rs

@@ -136,7 +136,7 @@ pub enum MacroDefKind {
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
-struct EagerCallInfo {
+pub struct EagerCallInfo {
     /// The expanded argument of the eager macro.
     arg: Arc<tt::Subtree>,
     /// Call id of the eager macro's input file (this is the macro file for its fully expanded input).
@@ -176,6 +176,8 @@ pub trait HirFileIdExt {
     /// expansion originated from.
     fn original_file(self, db: &dyn db::ExpandDatabase) -> FileId;
 
+    fn original_file_respecting_includes(self, db: &dyn db::ExpandDatabase) -> FileId;
+
     /// If this is a macro call, returns the syntax node of the call.
     fn call_node(self, db: &dyn db::ExpandDatabase) -> Option<InFile<SyntaxNode>>;
 
@@ -215,6 +217,29 @@ impl HirFileIdExt for HirFileId {
         }
     }
 
+    fn original_file_respecting_includes(mut self, db: &dyn db::ExpandDatabase) -> FileId {
+        loop {
+            match self.repr() {
+                base_db::span::HirFileIdRepr::FileId(id) => break id,
+                base_db::span::HirFileIdRepr::MacroFile(file) => {
+                    let loc = db.lookup_intern_macro_call(file.macro_call_id);
+                    if loc.def.is_include() {
+                        if let Some(eager) = &loc.eager {
+                            if let Ok(it) = builtin_fn_macro::include_input_to_file_id(
+                                db,
+                                file.macro_call_id,
+                                &eager.arg,
+                            ) {
+                                break it;
+                            }
+                        }
+                    }
+                    self = loc.kind.file_id();
+                }
+            }
+        }
+    }
+
     fn call_node(self, db: &dyn db::ExpandDatabase) -> Option<InFile<SyntaxNode>> {
         let macro_file = self.macro_file()?;
         let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
@@ -473,7 +498,7 @@ impl MacroCallKind {
     }
 
     /// Returns the file containing the macro invocation.
-    fn file_id(&self) -> HirFileId {
+    pub fn file_id(&self) -> HirFileId {
         match *self {
             MacroCallKind::FnLike { ast_id: InFile { file_id, .. }, .. }
             | MacroCallKind::Derive { ast_id: InFile { file_id, .. }, .. }

crates/hir-ty/src/tests/macros.rs

@@ -787,7 +787,6 @@ fn main() {
 }
 
 #[test]
-#[should_panic] // FIXME
 fn infer_builtin_macros_include_child_mod() {
     check_types(
         r#"

crates/ide-diagnostics/src/handlers/unresolved_macro_call.rs

@@ -67,22 +67,6 @@ macro_rules! m { () => {} } }
 
 self::m!(); self::m2!();
                 //^^ error: unresolved macro `self::m2!`
-"#,
-        );
-    }
-
-    #[test]
-    #[should_panic] // FIXME: https://github.com/rust-lang/rust-analyzer/issues/14968
-    fn include_does_not_break_diagnostics() {
-        check_diagnostics(
-            r#"
-//- minicore: include
-//- /lib.rs crate:lib
-include!("include-me.rs");
-//- /include-me.rs
-/// long doc that pushes the diagnostic range beyond the first file's text length
-#[err]
-mod prim_never {}
 "#,
         );
     }

crates/rust-analyzer/src/integrated_benchmarks.rs

@@ -30,7 +30,7 @@ fn integrated_highlighting_benchmark() {
 
     // Load rust-analyzer itself.
     let workspace_to_load = project_root();
-    let file = "./crates/ide-db/src/apply_change.rs";
+    let file = "./crates/rust-analyzer/src/config.rs";
 
     let cargo_config = CargoConfig::default();
     let load_cargo_config = LoadCargoConfig {