| // 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 nullable if Null <: T and not T <: Object. |
| * This is equivalent to the syntactic criterion that T is any of: |
| * Null |
| * S? for some S |
| * S* for some S where S is nullable |
| * FutureOr<S> for some S where S is nullable |
| * dynamic |
| * void |
| * |
| * @description Check that null can be assigned to nullable type. Test |
| * FutureOr<S> for some S where S is nullable |
| * @author sgrekhov@unipro.ru |
| */ |
| // Requirements=nnbd-strong |
| import "dart:async"; |
| |
| class C {} |
| |
| main() { |
| FutureOr<C?> fo1 = null; |
| FutureOr<int?> fo2 = null; |
| FutureOr fo3 = null; |
| FutureOr<void> fo4 = null; |
| FutureOr<Null> fo5 = null; |
| } |
