1 files changed, 21 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/in-assoc-type.rs b/tests/ui/impl-trait/in-assoc-type.rs
new file mode 100644
index 00000000000..36c54bdd6de
--- /dev/null
+++ b/tests/ui/impl-trait/in-assoc-type.rs
@@ -0,0 +1,21 @@
+#![feature(impl_trait_in_assoc_type)]
+
+trait Foo<T> {
+    type Bar;
+    fn foo(&self) -> <Self as Foo<()>>::Bar
+    where
+        Self: Foo<()>;
+}
+
+impl Foo<()> for () {
+    type Bar = impl std::fmt::Debug;
+    fn foo(&self) -> Self::Bar {}
+}
+
+impl Foo<i32> for () {
+    type Bar = u32;
+    fn foo(&self) -> <Self as Foo<()>>::Bar {}
+    //~^ ERROR: mismatched types
+}
+
+fn main() {}