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// 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.
import 'package:expect/expect.dart';
/// 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;
}
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)));
}