| // 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. |
| |
| class A {} |
| |
| class B extends A {} |
| |
| Iterable<B> f(Iterable<A> a) sync* { |
| yield* a; |
| // ^ |
| // [analyzer] STATIC_TYPE_WARNING.YIELD_OF_INVALID_TYPE |
| // [cfe] A value of type 'Iterable<A>' can't be assigned to a variable of type 'Iterable<B>'. |
| } |
| |
| void main() { |
| B b = new B(); |
| for (var x in f(<B>[b])) {} |
| } |