// Copyright (c) 2020, 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 Duration difference(DateTime other) 
 * Throws [Error] if [other] is [:null:].
 * @description Checks that compile error appears if [other] is statically
 * [null].
 * @author iarkh
 */

main() {
  DateTime.now().difference(null);
//                          ^
// [analyzer] unspecified
// [cfe] unspecified
}