1 files changed, 12 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error.rs b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error.rs
new file mode 100644
index 000000000..e5e7fb677
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/type-alias-impl-trait-with-cycle-error.rs
@@ -0,0 +1,12 @@
+#![feature(type_alias_impl_trait)]
+
+type Foo = impl Fn() -> Foo;
+//~^ ERROR: unconstrained opaque type
+
+fn crash(x: Foo) -> Foo {
+    x
+}
+
+fn main() {
+
+}