From 83f6dd14f8b33f076b92fbccfb020248b535cd07 Mon Sep 17 00:00:00 2001
From: Shoyu Vanilla <modulo641@gmail.com>
Date: Thu, 29 Feb 2024 00:52:30 +0900
Subject: [PATCH] Add a new failing test for Goto index_mut definition

---
 crates/ide/src/goto_definition.rs | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/crates/ide/src/goto_definition.rs b/crates/ide/src/goto_definition.rs
index 35efe144e1b..41148db6146 100644
--- a/crates/ide/src/goto_definition.rs
+++ b/crates/ide/src/goto_definition.rs
@@ -1955,6 +1955,34 @@ fn f() {
         );
     }
 
+    #[test]
+    fn goto_index_mut_op() {
+        check(
+            r#"
+//- minicore: index
+
+struct Foo;
+struct Bar;
+
+impl core::ops::Index<usize> for Foo {
+    type Output = Bar;
+
+    fn index(&self, index: usize) -> &Self::Output {}
+}
+
+impl core::ops::IndexMut<usize> for Foo {
+    fn index_mut(&mut self, index: usize) -> &mut Self::Output {}
+     //^^^^^^^^^
+}
+
+fn f() {
+    let mut foo = Foo;
+    foo[0]$0 = Bar;
+}
+"#,
+        );
+    }
+
     #[test]
     fn goto_prefix_op() {
         check(