Add regression test for #21622

Closes #21622

Author: frewsxcv

src/test/run-pass/issue-21622.rs

@@ -0,0 +1,28 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+
+struct Index;
+
+impl Index {
+    fn new() -> Self { Index }
+}
+
+fn user() {
+    let new = Index::new;
+
+    fn inner() {
+        let index = Index::new();
+    }
+
+    let index2 = new();
+}
+
+fn main() {}