// Copyright (c) 2017, 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"; | |
class A {} | |
class B extends A {} | |
class C { | |
Object operator [](B b) => null; | |
} | |
void main() { | |
A a1 = new B(); | |
A a2 = new A(); | |
C c = new C(); | |
c[a1]; // No error | |
Expect.throwsTypeError(() { | |
c[a2]; | |
}); | |
} |