hphp/hack/test/typecheck/closure_option.php

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