| /* |
| * 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 future flattening works correctly for [Future<Null>] |
| * type statically and the expression cannot be non-null. |
| * |
| * @author iarkh@unipro.ru |
| */ |
| |
| import "dart:async"; |
| |
| main() { |
| Future<Null>(() => 1); |
| // ^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| |
| Future<Future<Null>>(() => 1); |
| // ^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| |
| Future<Future<Null>>(() => Future<Null>(() => 1)); |
| // ^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |
