hphp/hack/test/typecheck/typing_fail_cast.php

   1 <?hh // strict
   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 B {
  13   public function g(): int { return 0;
  14   }
  15 }
  16
  17 class A<T> extends Exception implements B {
  18   public function f(): void {
  19   }
  20 }
  21
  22 function test1(mixed $x): A<bool> {
  23   if($x is A<_>) {
  24     return (A<bool>)$x;
  25   }
  26   throw new A();
  27 }