dart-sdk/tests/language/async/cascade_test.dart
Robert Nystrom 16f072c783 Migrate language_2/async to NNBD.
Change-Id: Id66e712eaf52fda2069ce5177aa091e373ad52c1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/134244
Commit-Queue: Bob Nystrom <rnystrom@google.com>
Reviewed-by: Nicholas Shahan <nshahan@google.com>
Reviewed-by: Erik Ernst <eernst@google.com>
Auto-Submit: Bob Nystrom <rnystrom@google.com>
2020-02-27 23:04:03 +00:00

31 lines
701 B
Dart

// Copyright (c) 2014, 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.
import 'dart:async';
import 'package:expect/expect.dart';
// Note, this is a regression test for:
// https://github.com/dart-lang/sdk/issues/29252
class Foo {
Future? _x;
int z = -1;
List list = [];
Future foo() async {
_x ??= new Future(() async {
z = await new Future.value(42);
list = list.toList()..add(z);
});
await _x;
return list[0];
}
}
main() async {
var f = new Foo();
var result = await f.foo();
Expect.equals(42, result);
}