Robert Nystrom
48608ce9bc
Change-Id: I8e21f82dc241a63f78fb1f6a25669b1aa633788c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/152080 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Leaf Petersen <leafp@google.com>
27 lines
790 B
Dart
27 lines
790 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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// Tests unconstrained inferencing with sound variance.
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// SharedOptions=--enable-experiment=variance
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class Covariant<out T> {}
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class Contravariant<in T> {}
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class Invariant<inout T> {}
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void covariantListInfer<T>(Covariant<List<T>> x) {}
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void contravariantListInfer<T>(Contravariant<List<T>> x) {}
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void invariantListInfer<T>(Invariant<List<T>> x) {}
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main() {
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var cov = new Covariant();
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covariantListInfer(Covariant());
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var contra = new Contravariant();
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contravariantListInfer(Contravariant());
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var inv = new Invariant();
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invariantListInfer(Invariant());
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}
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