/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

class A {}
class B<T> {} 

declare type Nullable<T> = T | undefined;
type MyType<T> = B<T> | undefined;

class C {
  c: number;
}

@Sendable
class D {
  a: Nullable<A>; // NOT OK
  b: Nullable<C> = new C(); // NOT OK
  c: Nullable<number> = 1; // OK
  d: MyType<number>; // NOT OK
}

let d = new D();