// 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 cannot return anything but [null] if parent method return type is
/// [Never].
///
/// @author iarkh@unipro.ru

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

import "dart:async";
import "override_checking_A01_opted_in_lib.dart";

class A1 implements OPTED_NEVER_RETURN {
  int getNever() => 1;
//    ^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
}

class A2 implements OPTED_NEVER_RETURN {
  Object getNever() => 1;
//       ^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
}

class A3 implements OPTED_NEVER_RETURN {
  dynamic getNever() => 1;
//        ^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
}

class A4 implements OPTED_NEVER_RETURN {
  FutureOr getNever() => 1;
//         ^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
}

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