1 files changed, 17 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/not_well_formed.rs b/src/test/ui/type-alias-impl-trait/not_well_formed.rs
new file mode 100644
index 000000000..fbb7a4d58
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/not_well_formed.rs
@@ -0,0 +1,17 @@
+#![feature(type_alias_impl_trait)]
+
+fn main() {}
+
+trait TraitWithAssoc {
+    type Assoc;
+}
+
+type Foo<V> = impl Trait<V::Assoc>; //~ associated type `Assoc` not found for `V`
+
+trait Trait<U> {}
+
+impl<W> Trait<W> for () {}
+
+fn foo_desugared<T: TraitWithAssoc>(_: T) -> Foo<T> {
+    ()
+}