pkg/front_end/testcases/nnbd_mixed/issue42003.dart

// 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 'issue42003_lib.dart';

main() {
  returnString()?.length;
}