hphp/hack/test/typecheck/test_michal.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 function test(?int $x): ?int {
  13   if ($x !== null) {
  14     $x = null;
  15   }
  16   return $x;
  17 }