hphp/hack/test/typecheck/trait_matching2.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 trait MyTrait {
  13   abstract protected function lol(): int;
  14
  15   public function getInt(): int {
  16     return $this->lol();
  17   }
  18 }
  19
  20 class C {
  21   use MyTrait;
  22
  23   protected function lol(): string {
  24     return 'hello world';
  25   }
  26 }
  27
  28 function takes_int(int $i): void {}
  29
  30 function broken(): void {
  31   $c = new C();
  32   takes_int($c->getInt());
  33 }
  34
  35 // broken();