// Copyright (c) 2021, 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.

import "dart:async";

typedef S1<T> = dynamic;
typedef S2<T> = Null;
typedef S3<T> = void;
typedef S4<T> = FutureOr;
typedef S5<T> = FutureOr<T>;

main() {}