hphp/hack/test/typecheck/functional_option.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 class A extends Exception {}
  13
  14 function f(?int $x): int {
  15   if (is_null($x)) {
  16     throw (new A());
  17   }
  18
  19   return $x;
  20 }