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// Copyright (c) 2018, 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 = 2.7
// dart2jsOptions=--strong --omit-implicit-checks --lax-runtime-type-to-string
import 'package:expect/expect.dart';
class Class1a<T> {
Class1a();
bool operator ==(other) {
if (identical(this, other)) return true;
return runtimeType == other?.runtimeType;
}
}
class Class1b<T> extends Class1a<T> {
Class1b();
}
class Class1c<T> implements Class1a<T> {
Class1c();
}
class Class2<T> {
Class2();
}
main() {
Class1a<int> cls1a = new Class1a<int>();
Class1a<int> cls1b1 = new Class1b<int>();
Class1a<int> cls1b2 = new Class1b<int>();
Class1c<int> cls1c = new Class1c<int>();
Class2<int> cls2 = new Class2<int>();
Expect.isFalse(cls1a == cls1b1);
Expect.isTrue(cls1b1 == cls1b2);
Expect.isFalse(cls1a == cls1c);
Expect.isFalse(cls1a == cls2);
}