hphp/hack/test/typecheck/abstract_defs.php

   1 <?hh
   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 trait FooTrait {
  13   abstract public function abstractFunc(): int;
  14   final public function doSomething(): int {
  15     return $this->abstractFunc();
  16   }
  17 }
  18
  19 abstract class Base {
  20   final public function abstractFunc(): int {
  21     return 4;
  22   }
  23 }
  24
  25 class Child extends Base {
  26   use FooTrait;
  27 }