1 files changed, 17 insertions, 0 deletions
diff --git a/tests/ui/type-alias-impl-trait/nested-tait-inference3.rs b/tests/ui/type-alias-impl-trait/nested-tait-inference3.rs
new file mode 100644
index 000000000..b0ebdd1bf
--- /dev/null
+++ b/tests/ui/type-alias-impl-trait/nested-tait-inference3.rs
@@ -0,0 +1,17 @@
+#![feature(type_alias_impl_trait)]
+#![allow(dead_code)]
+
+use std::fmt::Debug;
+
+type FooX = impl Debug;
+//~^ ERROR unconstrained opaque type
+
+trait Foo<A> { }
+
+impl Foo<FooX> for () { }
+
+fn foo() -> impl Foo<FooX> {
+    ()
+}
+
+fn main() { }