1 files changed, 15 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-20389.rs b/src/test/ui/issues/issue-20389.rs
new file mode 100644
index 000000000..9bc3efcc1
--- /dev/null
+++ b/src/test/ui/issues/issue-20389.rs
@@ -0,0 +1,15 @@
+// run-pass
+#![allow(dead_code)]
+// aux-build:issue-20389.rs
+
+// pretty-expanded FIXME #23616
+
+extern crate issue_20389;
+
+struct Foo;
+
+impl issue_20389::T for Foo {
+    type C = ();
+}
+
+fn main() {}