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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 // Dart core library. | 5 // Dart core library. |
6 | 6 |
7 patch class Null { | 7 patch class Null { |
8 | 8 |
9 factory Null._uninstantiable() { | 9 factory Null._uninstantiable() { |
10 throw new UnsupportedError( | 10 throw new UnsupportedError("class Null cannot be instantiated"); |
11 "class Null cannot be instantiated"); | |
12 } | 11 } |
13 | 12 |
14 int get _identityHashCode { | 13 static const _HASH_CODE = 2011; // The year Dart was announced and a prime. |
15 return 2011; // The year Dart was announced and a prime. | 14 int get _identityHashCode => _HASH_CODE; |
16 } | 15 int get hashCode => _HASH_CODE; |
17 | 16 |
18 String toString() { | 17 String toString() { |
19 return 'null'; | 18 return 'null'; |
20 } | 19 } |
21 } | 20 } |
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