// Copyright (c) 2017, 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

/// @assertion abstract class LinkedListEntry<E extends LinkedListEntry>
/// An object that can be an element in a [LinkedList].
/// All elements of a [LinkedList] must extend this class.
/// @description Checks that only [LinkedListEntry] can be an instance of
/// [LinkedList]
/// @author iarkh@unipro.ru

import "../../../Utils/expect.dart";
import "dart:collection";
import "LinkedListEntry.lib.dart";

main() {
  MyLinkedListEntry entry = new MyLinkedListEntry(1);
  LinkedList<MyLinkedListEntry> list = new LinkedList<MyLinkedListEntry>();
  list.add(entry);
  Expect.throws(() { list.add(1 as dynamic); });
}