| // Copyright (c) 2020, 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 The flatten function is modified as follows: |
| /// |
| /// [flatten(T)] is defined by cases on [T]: |
| /// |
| /// if [T] is [S?] then [flatten(T) = flatten(S)?] |
| /// otherwise if [T] is [S*] then [flatten(T) = flatten(S)*] |
| /// otherwise if [T] is [FutureOr<S>] then [flatten(T) = S] |
| /// otherwise [if T <: Future] then let [S] be a type such that [T <: |
| /// Future<S>] and for all [R], if [T <: Future<R>] then [S <: R]; then |
| /// [flatten(T) = S] |
| /// otherwise [flatten(T) = T] |
| /// |
| /// @description Check that type of await expression match with expected |
| /// [Never] type dynamically and the expression cannot be non-null. |
| /// |
| /// @author iarkh@unipro.ru |
| |
| // Requirements=nnbd-strong |
| |
| import "dart:async"; |
| import "../../Utils/expect.dart"; |
| |
| dynamic getInt() => 1; |
| |
| Future test() async { |
| Never i = await getInt(); |
| return i; |
| } |
| |
| main() { |
| asyncStart(); |
| test().then((value) { Expect.fail("Should not reach here!"); }, |
| onError:(e) => asyncEnd()); |
| } |