| // Copyright (c) 2017, 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. |
| // @dart=2.9 |
| /*@testedFeatures=checks*/ |
| library test; |
| |
| typedef void F<T>(T x); |
| |
| class B<T> { |
| B<T> operator +(B<T> other) => null; |
| } |
| |
| class C<T> { |
| B<F<T>> operator [](int i) => null; |
| void operator []=(int i, B<F<T>> x) {} |
| } |
| |
| void test(C<num> c) { |
| c[0] = new B<F<num>>(); |
| c /*@ checkReturn=B<(num*) ->* void>* */ [0] += new B<F<num>>(); |
| var x = c /*@ checkReturn=B<(num*) ->* void>* */ [0] += new B<F<num>>(); |
| c /*@ checkReturn=B<(num*) ->* void>* */ [0] ??= new B<F<num>>(); |
| var y = c /*@ checkReturn=B<(num*) ->* void>* */ [0] ??= new B<F<num>>(); |
| } |
| |
| main() {} |