// 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 extends legacy class and implements
/// opted-in class, child legacy field cannot be of any type but [Null] if parent
/// field is [Never].
///
/// @author iarkh@unipro.ru

// Requirements=nnbd-weak
// @dart=2.6

import "override_checking_A01_opted_in_lib.dart";

class B1 { int n; }
class A1 extends B1 implements OPTED_NEVER_FIELD {}
//    ^^
// [analyzer] unspecified
// [cfe] unspecified

class B2 { dynamic n; }
class A2 extends B2 implements OPTED_NEVER_FIELD {
//    ^^
// [analyzer] unspecified
// [cfe] unspecified
}

class B3 { Object n; }
class A3 extends B3 implements OPTED_NEVER_FIELD {
//    ^^
// [analyzer] unspecified
// [cfe] unspecified
}

class B4 { void n; }
class A4 extends B4 implements OPTED_NEVER_FIELD {
//    ^^
// [analyzer] unspecified
// [cfe] unspecified
}

main() {
  A1();
  A2();
  A3();
  A4();
}