LanguageFeatures/nnbd/weak/overriding/override_checking_A01_ARGS_t16.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 is a mixin with opted-in class,
/// legacy method can accept [null] argument if corresponding parent method
/// argument is of 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 with OPTED_NULLABLE_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_dynamic(dynamic d)   { Expect.isNull(d); }
  void test_futureOr(FutureOr f) { Expect.isNull(f); }
  void test_null(Null n)         { Expect.isNull(n); }
}

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