blob: bc68d950072617dcba45dd3e9e4241159e53b96d [file] [log] [blame]
// Copyright (c) 2012, 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";
class A {}
class B extends A {}
class C extends B {}
class D implements C {}
int inscrutable(int x) => (x == 0) ? 0 : (x | inscrutable(x & (x - 1)));
main() {
var things = [new A(), new B(), new C(), new D()];
var a = things[inscrutable(0)];
Expect.isTrue(a is A);
Expect.isFalse(a is B);
Expect.isFalse(a is C);
Expect.isFalse(a is D);
var b = things[inscrutable(1)];
Expect.isTrue(b is A);
Expect.isTrue(b is B);
Expect.isFalse(b is C);
Expect.isFalse(b is D);
var c = things[inscrutable(2)];
Expect.isTrue(c is A);
Expect.isTrue(c is B);
Expect.isTrue(c is C);
Expect.isFalse(c is D);
var d = things[inscrutable(3)];
Expect.isTrue(d is A);
Expect.isTrue(d is B);
Expect.isTrue(d is C);
Expect.isTrue(d is D);