1 files changed, 32 insertions, 0 deletions
diff --git a/src/test/ui/associated-types/impl-trait-return-missing-constraint.rs b/src/test/ui/associated-types/impl-trait-return-missing-constraint.rs
new file mode 100644
index 000000000..1de1ddbe3
--- /dev/null
+++ b/src/test/ui/associated-types/impl-trait-return-missing-constraint.rs
@@ -0,0 +1,32 @@
+trait Foo {
+    type Item;
+}
+
+trait Bar: Foo {}
+
+struct S;
+
+impl Foo for S {
+    type Item = i32;
+}
+impl Bar for S {}
+
+struct T;
+
+impl Foo for T {
+    type Item = u32;
+}
+impl Bar for T {}
+
+fn bar() -> impl Bar {
+    T
+}
+
+fn baz() -> impl Bar<Item = i32> {
+    //~^ ERROR type mismatch resolving `<impl Bar as Foo>::Item == i32`
+    bar()
+}
+
+fn main() {
+    let _ = baz();
+}