// 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 SplayTreeMap([int compare(K key1, K key2),
/// bool isValidKey(potentialKey)])
/// If the [compare] function is omitted, the objects are assumed to be
/// [Comparable], and are compared using their [Comparable.compareTo] method.
/// Non-comparable objects (including [null]) will not work as keys in that case.
/// @description Checks that if [compare] function is not specified then [key]
/// object should implement [Comparable]. If not exception is thrown
/// @author sgrekhov@unipro.ru

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

class C {
}

main() {
  SplayTreeMap map = new SplayTreeMap();
  Expect.throws(() { map[new C()] = null; });
}