| // 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. |
| |
| library test; |
| |
| /*@testedFeatures=inference*/ |
| |
| class A { |
| A f(A x, {A? y}) => throw ''; |
| A g(A x, {A? y}) => throw ''; |
| A h(A x, {A? y}) => throw ''; |
| } |
| |
| class B extends A implements I { |
| f(x, {y}) => throw ''; |
| g(x, {y}) => throw ''; |
| h(x, {y}) => throw ''; |
| } |
| |
| class I { |
| I f(I x, {I? y}) => throw ''; |
| A g(I x, {I? y}) => throw ''; |
| A h(A x, {I? y}) => throw ''; |
| } |
| |
| main() {} |