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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.
// @dart = 2.9
import 'dart:async';
* `return exp;` where `exp` has static type `S` is an error if `S` is not
assignable to `T`.
FutureOr<int> v = null;
String test() {
return /*@compile-error=unspecified*/ v;
void main() {