From bfae2634b496caa54f38f4c22d285c5fc1dad190 Mon Sep 17 00:00:00 2001
From: unexge <unexge@gmail.com>
Date: Wed, 23 Dec 2020 22:18:31 +0300
Subject: [PATCH] Prevent multiple incorrect case diagnostics in functions

---
 crates/hir/src/code_model.rs  |  6 +++---
 crates/ide/src/diagnostics.rs | 13 +++++++++++++
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/crates/hir/src/code_model.rs b/crates/hir/src/code_model.rs
index 1d7e5ddd7f6..6d17d546acf 100644
--- a/crates/hir/src/code_model.rs
+++ b/crates/hir/src/code_model.rs
@@ -374,8 +374,6 @@ pub fn diagnostics(self, db: &dyn HirDatabase, sink: &mut DiagnosticSink) {
         let crate_def_map = db.crate_def_map(self.id.krate);
         crate_def_map.add_diagnostics(db.upcast(), self.id.local_id, sink);
         for decl in self.declarations(db) {
-            decl.diagnostics(db, sink);
-
             match decl {
                 crate::ModuleDef::Function(f) => f.diagnostics(db, sink),
                 crate::ModuleDef::Module(m) => {
@@ -384,7 +382,9 @@ pub fn diagnostics(self, db: &dyn HirDatabase, sink: &mut DiagnosticSink) {
                         m.diagnostics(db, sink)
                     }
                 }
-                _ => (),
+                _ => {
+                    decl.diagnostics(db, sink);
+                }
             }
         }
 
diff --git a/crates/ide/src/diagnostics.rs b/crates/ide/src/diagnostics.rs
index 3ad30f0c9e2..b2714cb6915 100644
--- a/crates/ide/src/diagnostics.rs
+++ b/crates/ide/src/diagnostics.rs
@@ -895,4 +895,17 @@ pub fn some_fn() -> TestStruct {
 "#,
         );
     }
+
+    #[test]
+    fn test_single_incorrect_case_diagnostic_in_function_name_issue_6970() {
+        let input = r#"fn FOO<|>() {}"#;
+        let expected = r#"fn foo() {}"#;
+
+        let (analysis, file_position) = fixture::position(input);
+        let diagnostics =
+            analysis.diagnostics(&DiagnosticsConfig::default(), file_position.file_id).unwrap();
+        assert_eq!(diagnostics.len(), 1);
+
+        check_fixes(input, expected);
+    }
 }