pkg/front_end/testcases/general/default_values.dart

// Copyright (c) 2016, 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
topLevel([a = 42]) => a;

main() {
  print(topLevel());
}