1 files changed, 13 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-3052.rs b/src/test/ui/issues/issue-3052.rs
new file mode 100644
index 000000000..ee2456da3
--- /dev/null
+++ b/src/test/ui/issues/issue-3052.rs
@@ -0,0 +1,13 @@
+// run-pass
+#![allow(dead_code)]
+// pretty-expanded FIXME #23616
+
+type Connection = Box<dyn FnMut(Vec<u8>) + 'static>;
+
+fn f() -> Option<Connection> {
+    let mock_connection: Connection = Box::new(|_| {});
+    Some(mock_connection)
+}
+
+pub fn main() {
+}