1 files changed, 28 insertions, 0 deletions
diff --git a/tests/ui/type-alias-impl-trait/underconstrained_generic.rs b/tests/ui/type-alias-impl-trait/underconstrained_generic.rs
new file mode 100644
index 000000000..aa537dfc9
--- /dev/null
+++ b/tests/ui/type-alias-impl-trait/underconstrained_generic.rs
@@ -0,0 +1,28 @@
+#![feature(type_alias_impl_trait)]
+
+use std::marker::PhantomData;
+
+trait Trait {
+    fn foo<T, U>(t: T) -> U;
+}
+
+trait ProofForConversion<X> {
+    fn convert<T, U>(_: PhantomData<Self>, r: T) -> U;
+}
+
+impl<X: Trait> ProofForConversion<X> for () {
+    fn convert<T, U>(_: PhantomData<Self>, r: T) -> U {
+        X::foo(r)
+    }
+}
+
+type Converter<T> = impl ProofForConversion<T>;
+
+fn _defining_use<T: Trait>() -> Converter<T> {
+    ()
+    //~^ ERROR the trait bound `T: Trait` is not satisfied
+}
+
+
+fn main() {
+}