1 files changed, 15 insertions, 0 deletions
diff --git a/src/test/ui/associated-types/issue-21363.rs b/src/test/ui/associated-types/issue-21363.rs
new file mode 100644
index 000000000..acc28cb43
--- /dev/null
+++ b/src/test/ui/associated-types/issue-21363.rs
@@ -0,0 +1,15 @@
+// check-pass
+// pretty-expanded FIXME #23616
+
+#![no_implicit_prelude]
+
+trait Iterator {
+    type Item;
+    fn dummy(&self) { }
+}
+
+impl<'a, T> Iterator for &'a mut (dyn Iterator<Item=T> + 'a) {
+    type Item = T;
+}
+
+fn main() {}