// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file | |
// for details. All rights reserved. Use of this source code is governed by a | |
// BSD-style license that can be found in the LICENSE file. | |
library dart.async; | |
abstract class FutureOr<T> {} | |
abstract class Future<T> {} | |
abstract class Stream<T> {} |