1 files changed, 22 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/unused_generic_param.rs b/src/test/ui/type-alias-impl-trait/unused_generic_param.rs
new file mode 100644
index 000000000..ad5e4918c
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/unused_generic_param.rs
@@ -0,0 +1,22 @@
+// check-pass
+
+#![feature(type_alias_impl_trait)]
+#![allow(dead_code)]
+
+fn main() {}
+
+type PartiallyDefined<T> = impl Sized;
+
+fn partially_defined<T: std::fmt::Debug>(_: T) -> PartiallyDefined<T> {
+    4u32
+}
+
+type PartiallyDefined2<T> = impl Sized;
+
+fn partially_defined2<T: std::fmt::Debug>(_: T) -> PartiallyDefined2<T> {
+    4u32
+}
+
+fn partially_defined22<T>(_: T) -> PartiallyDefined2<T> {
+    4u32
+}