| /* |
| * 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 matches with expected |
| * `Future<FutureOr<Never>>` type dynamically and the expression cannot be |
| * `null` in the weak mode. |
| * |
| * We'll have to keep this one on a waiting list, blocked by |
| * https://github.com/dart-lang/language/issues/1346 (or some issue that can be |
| * found looking at 1346, if the discussion is taken somewhere else, say |
| * https://github.com/dart-lang/sdk/issues/44246). |
| |
| * |
| * @Issue https://github.com/dart-lang/language/pull/941 |
| * @Issue https://github.com/dart-lang/co19/issues/703 |
| * @Issue 41266,41437,42236,42237 |
| * @Issue https://github.com/dart-lang/language/issues/1346 |
| * |
| * @author iarkh@unipro.ru |
| */ |
| // Requirements=nnbd-weak |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| dynamic getNull() => null; |
| |
| Future<FutureOr<Never>> test() async => await getNull(); |
| |
| main() { |
| asyncStart(); |
| test().then((value) { Expect.fail("Should not reach here!"); }, |
| onError:(e) => asyncEnd()); |
| } |