Add testcase for rust-lang#11493

src/test/compile-fail/issue-11493.rs

@@ -0,0 +1,16 @@
+// 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.
+
+// This file must never have a trailing newline
+
+fn main() {
+    let x = Some(3);
+    let y = x.as_ref().unwrap_or(&5); //~ ERROR: borrowed value does not live long enough
+}