hphp/hack/test/typecheck/integrate_null2.php

   1 <?hh
   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 function foo(array<int> $arr): ?array<int> {
  13   $x = null;
  14   if (coin_flip()) {
  15     $x = $arr;
  16   }
  17   return $x;
  18 }