Robert Nystrom
359023d699
Change-Id: I915bc1adde6ef377a5043aab07ba0519cc03164f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149040 Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Erik Ernst <eernst@google.com> Commit-Queue: Bob Nystrom <rnystrom@google.com>
33 lines
772 B
Dart
33 lines
772 B
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import "package:expect/expect.dart";
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class A {}
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class B extends A {}
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class C implements B {}
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int inscrutable(int x) => x == 0 ? 0 : x | inscrutable(x & (x - 1));
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main() {
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var things = [new A(), new B(), new C()];
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var a = things[inscrutable(0)];
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Expect.isTrue(a is A);
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Expect.isFalse(a is B);
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Expect.isFalse(a is C);
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var b = things[inscrutable(1)];
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Expect.isTrue(b is A);
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Expect.isTrue(b is B);
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Expect.isFalse(b is C);
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var c = things[inscrutable(2)];
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Expect.isTrue(c is A);
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Expect.isTrue(c is B);
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Expect.isTrue(c is C);
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}
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