Apply case check diagnostic to impl items

Author: popzxc

crates/hir/src/code_model.rs

@@ -781,7 +781,8 @@ impl Function {
     }
 
     pub fn diagnostics(self, db: &dyn HirDatabase, sink: &mut DiagnosticSink) {
-        hir_ty::diagnostics::validate_body(db, self.id.into(), sink)
+        hir_ty::diagnostics::validate_module_item(db, self.id.into(), sink);
+        hir_ty::diagnostics::validate_body(db, self.id.into(), sink);
     }
 
     /// Whether this function declaration has a definition.

crates/ide/src/diagnostics.rs

@@ -903,6 +903,30 @@ fn some_fn() {
 fn foo() {
     const ANOTHER_ITEM<|>: &str = "some_item";
 }
+"#,
+        );
+    }
+
+    #[test]
+    fn test_rename_incorrect_case_struct_method() {
+        check_fixes(
+            r#"
+pub struct TestStruct;
+
+impl TestStruct {
+    pub fn SomeFn<|>() -> TestStruct {
+        TestStruct
+    }
+}
+"#,
+            r#"
+pub struct TestStruct;
+
+impl TestStruct {
+    pub fn some_fn() -> TestStruct {
+        TestStruct
+    }
+}
 "#,
         );
     }