| // 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 local inference errors for the `out` variance modifier. |
| |
| // SharedOptions=--enable-experiment=variance |
| |
| class Covariant<out T> {} |
| |
| class Exactly<inout T> {} |
| |
| class Upper {} |
| class Middle extends Upper {} |
| class Lower extends Middle {} |
| |
| Exactly<T> inferCovCov<T>(Covariant<T> x, Covariant<T> y) => new Exactly<T>(); |
| |
| main() { |
| Exactly<Lower> lower; |
| |
| var inferredMiddle = inferCovCov(Covariant<Lower>(), Covariant<Middle>()); |
| lower = inferredMiddle; |
| // ^ |
| // [analyzer] unspecified |
| // [cfe] A value of type 'Exactly<Middle>' can't be assigned to a variable of type 'Exactly<Lower>'. |
| |
| var inferredUpper = inferCovCov(Covariant<Lower>(), Covariant<Upper>()); |
| lower = inferredUpper; |
| // ^ |
| // [analyzer] unspecified |
| // [cfe] A value of type 'Exactly<Upper>' can't be assigned to a variable of type 'Exactly<Lower>'. |
| } |