// 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.

main() async {
  List<String>? a = <String>[];
  Iterable<String>? b = a?.map((e) => e);
  Iterable<String>? i = b ?? a;
  print(i);
}