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48b1656690
According to our typing rules a Set<Apple> is a Set<Fruit>. However, before this change, we couldn't use it as a Set<Fruit>:
===
bool foo(Set<Fruit> fruits) {
// Would yield a type-error since we actually got a Set<Apple>.
return fruits.contains(new Banana());
}
foo(new Set<Apple>());
===
R=ajohnsen@google.com, blois@google.com, lrn@google.com
Review URL: https://codereview.chromium.org//14246008
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@24326 260f80e4-7a28-3924-810f-c04153c831b5
23 lines
622 B
Dart
23 lines
622 B
Dart
// Copyright (c) 2011, 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 { const A(); }
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class B extends A { const B(); }
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main() {
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var map1 = new Map<B, B>();
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map1[const B()] = const B();
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var map2 = new Map<B, B>();
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var list = <B>[ const B() ];
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var maps = [map1, map2];
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for (var map in maps) {
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// Test that the map accepts a key is not of the same type:
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// Map<B, ?>[A]
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Expect.isNull(map[new A()]);
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}
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}
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