1 files changed, 17 insertions, 0 deletions
diff --git a/tests/ui/type-alias-impl-trait/generic_duplicate_param_use8.rs b/tests/ui/type-alias-impl-trait/generic_duplicate_param_use8.rs
new file mode 100644
index 000000000..3a4b5047b
--- /dev/null
+++ b/tests/ui/type-alias-impl-trait/generic_duplicate_param_use8.rs
@@ -0,0 +1,17 @@
+#![feature(type_alias_impl_trait)]
+
+use std::fmt::Debug;
+
+fn main() {}
+
+type Two<T, U> = impl Debug;
+
+fn two<T: Debug, U: Debug>(t: T, _: U) -> Two<T, U> {
+    (t, 4u32)
+    //~^ ERROR `T` doesn't implement `Debug`
+}
+
+fn three<T: Debug, U: Debug>(_: T, u: U) -> Two<T, U> {
+    (u, 4u32)
+    //~^ ERROR `U` doesn't implement `Debug`
+}