From 31171eed5eeab217280237e63ffe6adda62baf96 Mon Sep 17 00:00:00 2001
From: Florian Diebold <flodiebold@gmail.com>
Date: Sat, 29 Feb 2020 22:48:23 +0100
Subject: Do autoderef for indexing

---
 crates/ra_hir_ty/src/tests/traits.rs | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'crates/ra_hir_ty/src/tests')

diff --git a/crates/ra_hir_ty/src/tests/traits.rs b/crates/ra_hir_ty/src/tests/traits.rs
index 7d796d0b9..547010b35 100644
--- a/crates/ra_hir_ty/src/tests/traits.rs
+++ b/crates/ra_hir_ty/src/tests/traits.rs
@@ -567,6 +567,34 @@ mod ops {
     assert_eq!("Foo", type_at_pos(&db, pos));
 }
 
+#[test]
+fn infer_ops_index_autoderef() {
+    let (db, pos) = TestDB::with_position(
+        r#"
+//- /main.rs crate:main deps:std
+fn test() {
+    let a = &[1u32, 2, 3];
+    let b = a[1];
+    b<|>;
+}
+
+//- /std.rs crate:std
+impl<T> ops::Index<u32> for [T] {
+    type Output = T;
+}
+
+#[prelude_import] use ops::*;
+mod ops {
+    #[lang = "index"]
+    pub trait Index<Idx> {
+        type Output;
+    }
+}
+"#,
+    );
+    assert_eq!("u32", type_at_pos(&db, pos));
+}
+
 #[test]
 fn deref_trait() {
     let t = type_at(
-- 
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