LanguageFeatures/nnbd/override_checking_A01_FIELD_t18.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 field can be unassigned when corresponding parent field is of
 * nullable type.
 *
 * @author iarkh@unipro.ru
 */
// SharedOptions=--enable-experiment=non-nullable
// @dart=2.6

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

class A with OPTED_NULLABLE_FIELD {
  int i;
  Object o;
  dynamic d;
  Function f;
  Null n;
  FutureOr fo;
  void v;
}

main() {
  A a = A();
  Expect.isNull(a.i);
  Expect.isNull(a.o);
  Expect.isNull(a.f);
  Expect.isNull(a.d);
  Expect.isNull(a.n);
  Expect.isNull(a.fo);
}