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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
/// @description Regression test for the issue 33701 (Dart does not throw error
/// if function argument parameter extends [Null]). Checks that [typedef]
/// parameter argument cannot be [Null]
/// @Issue 33701
/// @author iarkh@unipro.ru
typedef F<X extends Null> = void Function();
main() {}