dart-sdk/tests/web/42501_test.dart

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// 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.
import 'package:expect/expect.dart';
typedef F = num? Function();
F foo() {
T? local<T>() => null;
return local;
}
void main() {
Expect.type<F>(foo());
}