hphp/hack/test/typecheck/gen4.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 class A {
  13   public function foo<T as A>(): T {
  14     return $this->foo();
  15   }
  16 }
  17
  18 class B extends A {
  19
  20   public function foo<T as B>(): T {
  21     return $this->foo();
  22   }
  23 }
  24
  25