hphp/hack/test/typecheck/closure_option.php

   1 <?hh
   2 /**
   3  * Copyright (c) 2014, Facebook, Inc.
   4  * All rights reserved.
   5  *
   6  * This source code is licensed under the MIT license found in the
   7  * LICENSE file in the "hack" directory of this source tree.
   8  *
   9  *
  10  */
  11
  12 class Foo {
  13   public function thing() : void {
  14     $x = function(?string $y = null) : void { };
  15
  16     $x('');
  17   }
  18 }