LanguageFeatures/nnbd/weak/overriding/override_checking_A01_FIELD_t23.dart

/*
 * 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 In an unmigrated library, override checking is done using legacy
 * types. This means that an unmigrated library can bring together otherwise
 * incompatible methods. When choosing the most specific signature during
 * interface computation, all nullability and requiredness annotations are
 * ignored, and the [Never] type is treated as [Null].
 *
 * @description Check that if legacy class is a mixin with opted-in class,
 * compile error does not appear and runtime error is thrown when legacy field
 * is of the type [Null] and corresponding parent field is of the type [Never].
 *
 * @Issue 40389
 *
 * @author iarkh@unipro.ru
 */
// Requirements=nnbd-weak
// @dart=2.6

import "../../../../Utils/expect.dart";
import "override_checking_A01_opted_in_lib.dart";

class A with OPTED_NEVER_FIELD {
  Null n;
}

main() {
  Expect.throws(() { A(); });
}