tests/language_2/issue_23914_test.dart

// Copyright (c) 2015, 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 'dart:collection';

class C extends LinkedListEntry<C> {}

main() {
  var ll = new LinkedList<C>();
  var a = new List.unmodifiable(ll);
}