<?hh // strict
/**
 * Copyright (c) 2014, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the "hack" directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 */

trait MyTrait<T> {
  protected Vector<T> $a;
  public function test(): T {
    return $this->a[0];
  }
}

class A {
  use MyTrait<A>;

  public function __construct(A $x) {
    $this->a = Vector {$x};
  }
}
