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// Copyright (c) 2018, 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';
/*
* `return exp;` where `exp` has static type `S` is an error if
`Future<flatten(S)>` is not assignable to `T`.
*/
Future<int> v = null;
Future<String> test() async {
return /*@compile-error=unspecified*/ v;
}
void main() {
test();
}