LanguageFeatures/nnbd/override_checking_A01_t45.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,
 * legacy setter can accept null values if corresponding parent setter is of
 * both nullable or non-nullable type.
 *
 * @author iarkh@unipro.ru
 */
// SharedOptions=--enable-experiment=non-nullable
// @dart=2.6

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

class A1 with A {
  void set set_field1(String str) {
    Expect.isNull(str);
  }

  void set set_field2(String str) {
    Expect.isNull(str);
  }
}

main() {
  A1 a1 = A1();
  a1.set_field1 = null;
  a1.set_field2 = null;
}