// Copyright (c) 2019, 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.

/// @assertion A generic type alias is a declaration [D] of one of the following
/// forms:
///    m typedef id<X1extendsB1, ..., Xs extendsBs> = T;
/// ...
/// where [m] is derived from metadata, [T] is a type, and [S?] is a type or the
/// empty string. Let [S0] be [S?] if it is a type, otherwise let [S0] be
/// [dynamic]. The associated type of [D], call it [F], is, respectively:
///   T
/// ...
/// @description Checks that [T] can be [dynamic], [void], [Null], [FutureOr].
/// @author iarkh@unipro.ru

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() {}