hphp/hack/test/typecheck/test_erling.php

   1 <?hh // partial
   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 function bar(Vector<A> $x) {}
  13
  14 function foo(Vector<?A> $x): Vector<A> {
  15   bar($x);
  16   return $x;
  17 }
  18
  19 class A {}