Kallen Tu
aa6709974d
Change-Id: I056535cbfc74554de408ce4f9d89c142c4c860cf Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/128771 Reviewed-by: Leaf Petersen <leafp@google.com> Reviewed-by: Dmitry Stefantsov <dmitryas@google.com> Commit-Queue: Kallen Tu <kallentu@google.com>
27 lines
790 B
Dart
27 lines
790 B
Dart
// Copyright (c) 2019, 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.
|
|
|
|
// Tests unconstrained inferencing with sound variance.
|
|
|
|
// SharedOptions=--enable-experiment=variance
|
|
|
|
class Covariant<out T> {}
|
|
class Contravariant<in T> {}
|
|
class Invariant<inout T> {}
|
|
|
|
void covariantListInfer<T>(Covariant<List<T>> x) {}
|
|
void contravariantListInfer<T>(Contravariant<List<T>> x) {}
|
|
void invariantListInfer<T>(Invariant<List<T>> x) {}
|
|
|
|
main() {
|
|
var cov = new Covariant();
|
|
covariantListInfer(Covariant());
|
|
|
|
var contra = new Contravariant();
|
|
contravariantListInfer(Contravariant());
|
|
|
|
var inv = new Invariant();
|
|
invariantListInfer(Invariant());
|
|
}
|