1 files changed, 25 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use9.rs b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use9.rs
new file mode 100644
index 000000000..6afcdfe4d
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_duplicate_param_use9.rs
@@ -0,0 +1,25 @@
+#![feature(type_alias_impl_trait)]
+
+use std::fmt::Debug;
+
+fn main() {}
+
+type Two<A, B> = impl Debug;
+
+trait Foo {
+    type Bar: Debug;
+    const BAR: Self::Bar;
+}
+
+fn two<T: Debug + Foo, U: Debug>(t: T, u: U) -> Two<T, U> {
+    (t, u, T::BAR)
+    //~^ ERROR the trait bound `A: Foo` is not satisfied
+    //~| ERROR `A` doesn't implement `Debug`
+    //~| ERROR `B` doesn't implement `Debug`
+}
+
+fn three<T: Debug, U: Debug>(t: T, u: U) -> Two<T, U> {
+    (t, u, 42)
+    //~^ ERROR `A` doesn't implement `Debug`
+    //~| ERROR `B` doesn't implement `Debug`
+}