// Copyright (c) 2021, 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'; | |
Future<int> foo<X extends Object?>(X x) async { | |
if (x is Future<int>) { | |
return x; | |
} else { | |
throw 42; | |
} | |
} | |
main() {} |