LanguageFeatures/nnbd/weak/overriding/override_checking_A01_ARGS_t08.dart

// Copyright (c) 2020, 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 implements opted-in class, legacy
 * method can accept [null] arguments if corresponding parent method argument is
 * of non-nullable type.
 *
 * @author iarkh@unipro.ru
 */
// Requirements=nnbd-weak
// @dart=2.6

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

class A implements OPTED_NONNULLABLE_ARGS {
  void test_int     (int           i) { Expect.isNull(i); }
  void test_object  (Object        o) { Expect.isNull(o); }
  void test_function(Function      f) { Expect.isNull(f); }
  void test_futureOr(FutureOr<int> f) { Expect.isNull(f); }
}

main() {
  A a = A();
  a.test_int(null);
  a.test_object(null);
  a.test_function(null);
  a.test_futureOr(null);
}