Kallen Tu
89220fd812
With the experiment flag on, will properly parse the `in`/`out`/`inout` keywords. Without it, will issue an error regarding the flag. First CL for parsing, syntax support, no AST work yet. Keywords only parse correctly for classes and mixins. See test `variance_disabled_syntax_test.dart`. Change-Id: I37d765804fa0752512abf52fa44456a173087ef0 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/117929 Commit-Queue: Kallen Tu <kallentu@google.com> Reviewed-by: Leaf Petersen <leafp@google.com> Reviewed-by: Dan Rubel <danrubel@google.com>
46 lines
753 B
Dart
46 lines
753 B
Dart
// Copyright (c) 2019, 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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// SharedOptions=--enable-experiment=variance
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import 'package:expect/expect.dart';
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abstract class A<in X> {
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int foo(X bar);
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}
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class B<out X, in Y, inout Z> {}
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class C<in T> extends A<T> {
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@override
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int foo(T bar) {
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return 2;
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}
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}
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mixin D<out T> {}
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class E1 {}
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mixin E<in T extends E1> {}
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class F<out T> = Object with D<T>;
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class G<out out> {}
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class H<out inout> {}
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main() {
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B<int, String, bool> b = B();
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C<int> c = C();
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Expect.equals(2, c.foo(3));
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F<int> f = F();
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G<int> g = G();
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H<int> h = H();
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}
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