| OLD | NEW |
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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 part of dart.core; | 5 part of dart.core; |
| 6 | 6 |
| 7 /** | 7 /** |
| 8 * The reserved word [:null:] denotes an object that is the sole instance of | 8 * The reserved word [:null:] denotes an object that is the sole instance of |
| 9 * this class. | 9 * this class. |
| 10 * | 10 * |
| 11 * It is a compile-time error for a class to attempt to extend or implement | 11 * It is a compile-time error for a class to attempt to extend or implement |
| 12 * Null. | 12 * Null. |
| 13 */ | 13 */ |
| 14 class Null { | 14 class Null { |
| 15 factory Null._uninstantiable() { | 15 factory Null._uninstantiable() { |
| 16 throw new UnsupportedError('class Null cannot be instantiated'); | 16 throw new UnsupportedError('class Null cannot be instantiated'); |
| 17 } | 17 } |
| 18 | 18 |
| 19 external dynamic noSuchMethod(Invocation invocation); | |
| 20 | |
| 21 /** Returns the string `"null"`. */ | 19 /** Returns the string `"null"`. */ |
| 22 String toString() => "null"; | 20 String toString() => "null"; |
| 23 } | 21 } |
| OLD | NEW |
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Chromium Code Reviews
Issue 2403203002:
Revert "Give useful message for null derefs" (Closed)
