| // 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. |
| |
| /// @assertion Let f be an asynchronous non-generator function with declared |
| /// return type T. Then the future value type of f is futureValueType(T). The |
| /// function futureValueType is defined as follows: |
| /// |
| /// futureValueType(S?) = futureValueType(S), for all S. |
| /// futureValueType(S*) = futureValueType(S), for all S. |
| /// futureValueType(Future<S>) = S, for all S. |
| /// futureValueType(FutureOr<S>) = S, for all S. |
| /// futureValueType(void) = void. |
| /// futureValueType(dynamic) = dynamic. |
| /// Otherwise, for all S, futureValueType(S) = Object?. |
| /// |
| /// @description Check that for asynchronous non-generator function with declared |
| /// return type futureValueType(Future<S>?) = S, for all S. Test that |
| /// when return type of async function is Future<C>? then we cannot return C? from |
| /// the function |
| /// |
| /// @author sgrekhov@unipro.ru |
| |
| class C {} |
| |
| Future<C>? foo() async { |
| C? c = new C(); |
| bool b = (() => true)(); |
| if (b) { |
| c = null; |
| } |
| return c; |
| // ^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |
| |
| main() { |
| foo(); |
| } |