Regression test for #13665

Closes #13665.

src/test/run-pass/issue-13665.rs

@@ -0,0 +1,22 @@
+// Copyright 2014 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.
+
+fn foo<'r>() {
+  let maybe_value_ref: Option<&'r u8> = None;
+
+  let _ = maybe_value_ref.map(|& ref v| v);
+  let _ = maybe_value_ref.map(|& ref v| -> &'r u8 {v});
+  let _ = maybe_value_ref.map(|& ref v: &'r u8| -> &'r u8 {v});
+  let _ = maybe_value_ref.map(|& ref v: &'r u8| {v});
+}
+
+fn main() {
+  foo();
+}