blob: 55cceedc431b993a080e9b05883a8a0dd2fa4e75 [file] [log] [blame]
// 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 legacy
/// types dynamically and the expression can be null in weak mode.
/// @author
// Requirements=nnbd-weak
import "dart:async";
import "../../../Utils/expect.dart";
import "future_flattening_legacy_lib.dart";
dynamic getNull() => null;
Future<A> test() async {
A a = await getNull();
return a;
main() {
test().then((value) => asyncEnd());