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// Copyright (c) 2011, 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.
/// @assertion Map<K, V> abstract class
/// An unordered collection of key-value pairs, from which you retrieve a value
/// by using its associated key.
/// Each key must be unique.
/// @description Checks that null keys are supported.
/// @author kaigorodov
import "../../../Utils/expect.dart";
main() {
Map<String?, Object> map = new Map<String?, Object>();
map[null] = "123";
Expect.equals("123", map[null]);