| // 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() {} |
