1 files changed, 17 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/impl-with-unconstrained-param.rs b/src/test/ui/type-alias-impl-trait/impl-with-unconstrained-param.rs
new file mode 100644
index 000000000..851c2f66c
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/impl-with-unconstrained-param.rs
@@ -0,0 +1,17 @@
+// Ensure that we don't ICE if associated type impl trait is used in an impl
+// with an unconstrained type parameter.
+
+#![feature(type_alias_impl_trait)]
+
+trait X {
+    type I;
+    fn f() -> Self::I;
+}
+
+impl<T> X for () {
+    //~^ ERROR the type parameter `T` is not constrained
+    type I = impl Sized;
+    fn f() -> Self::I {}
+}
+
+fn main() {}