| // 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. |
| |
| // @dart = 2.9 |
| |
| import 'package:expect/expect.dart'; |
| |
| /// Returns its argument. |
| /// |
| /// Prevents static optimizations and inlining. |
| getValueNonOptimized(x) { |
| // DateTime.now() cannot be predicted statically, never equal to ASCII 42 '*'. |
| if (DateTime.now().millisecondsSinceEpoch == 42) |
| return getValueNonOptimized(2); |
| return x; |
| } |
| |
| class MyClass { |
| final int n; |
| |
| const MyClass(this.n); |
| |
| int get hashCode => super.hashCode + 1; |
| } |
| |
| main() { |
| const constInstance = MyClass(1); |
| final nonConstInstance = MyClass(1); |
| |
| const constSet = {MyClass(1)}; |
| final nonConstSet = {constInstance}; |
| final nonConstSet2 = {nonConstInstance}; |
| |
| // operator== is _not_ overridden, so instances are not equal. |
| Expect.notEquals(constInstance, nonConstInstance); |
| |
| Expect.isTrue(constSet.contains(getValueNonOptimized(constInstance))); |
| Expect.isFalse(constSet.contains(getValueNonOptimized(nonConstInstance))); |
| Expect.isTrue(nonConstSet.contains(getValueNonOptimized(constInstance))); |
| Expect.isFalse(nonConstSet.contains(getValueNonOptimized(nonConstInstance))); |
| Expect.isFalse(nonConstSet2.contains(getValueNonOptimized(constInstance))); |
| Expect.isTrue(nonConstSet2.contains(getValueNonOptimized(nonConstInstance))); |
| } |