// 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.
import 'dart:collection';

class MyList extends Object with ListMixin {
  int length = 0;
  operator[](index) => null;
  void operator[]=(index, value) {}
}

main() {
  new MyList().length;
}