| /* |
| * 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. |
| */ |
| /** |
| * @assertion We say that a type T is non-nullable if T <: Object. This is |
| * equivalent to the syntactic criterion that T is any of: |
| * Never |
| * Any function type (including Function) |
| * Any interface type except Null. |
| * S* for some S where S is non-nullable |
| * FutureOr<S> where S is non-nullable |
| * X extends S where S is non-nullable |
| * X & S where S is non-nullable |
| * |
| * @description Check that type which is not subtype of Object cannot be |
| * assigned to non-nullable type. Test X & S where S is non-nullable |
| * @author sgrekhov@unipro.ru |
| */ |
| |
| class A {} |
| class S extends A {} |
| |
| main() { |
| A a = new S(); |
| if (a is S) { |
| a = null; |
| // ^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |
| } |
