hphp/hack/test/typecheck/this.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 X {
  13   public function foo(): this {
  14     return $this;
  15   }
  16 }
  17
  18 class Y<T> extends X {
  19
  20   public function bar(Y<T> $y): this {
  21     return $this->foo()->bar($this->foo());
  22   }
  23 }