hphp/hack/test/typecheck/typedef17.php

   1 <?hh // strict
   2 /**
   3  * Copyright (c) 2018, 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 type A<T as string> = vec<T>;
  13
  14 function f0<T as string>(A<T> $foo): T {
  15   return $foo[0];
  16 }
  17
  18 function f1(vec<string> $x): void {
  19   f0($x);
  20 }
  21
  22 function f2(vec<int> $x): void {
  23   f0($x);
  24 }