| // Copyright (c) 2021, 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. |
| |
| // Tests lookup of null in const maps. |
| |
| // @dart = 2.9 |
| |
| import 'package:expect/expect.dart'; |
| |
| main() { |
| final map1 = const {1: 42, null: 2, 'asdf': 'fdsa'}; |
| Expect.equals(2, map1[getValueNonOptimized(null)]); |
| Expect.isTrue(map1.containsKey(null)); |
| final map2 = const {1: 42, 2: 2, 'asdf': 'fdsa'}; |
| Expect.equals(null, map2[getValueNonOptimized(null)]); |
| Expect.isFalse(map2.containsKey(null)); |
| } |
| |
| /// Returns its argument. |
| /// |
| /// Prevents static optimizations and inlining. |
| @pragma('vm:never-inline') |
| @pragma('dart2js:noInline') |
| dynamic getValueNonOptimized(dynamic x) { |
| // DateTime.now() cannot be predicted statically, never equal to 42. |
| if (DateTime.now().millisecondsSinceEpoch == 42) { |
| return getValueNonOptimized(2); |
| } |
| return x; |
| } |