pkg/front_end/testcases/general/top_level_library_method.dart

// 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
library() {
  print("Hello, World!");
}

main() => library();