// Copyright (c) 2016, 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 void unlink()
/// ...
/// The entry must currently be in a linked list when this method is called.
/// @description Checks that the entry must not be already unlinked
/// @author sgrekhov@unipro.ru

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

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