LanguageFeatures/Class-modifiers/versioning_A03_t04.dart

// Copyright (c) 2023, 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 Any post-feature library declaration which has a platform library
/// class marked base or final as a superinterface must be marked base, final or
/// sealed, and cannot be implemented locally, even if the superinterface chain
/// goes through a pre-feature library declaration, and even if that declaration
/// ignores the base modifier.
///
/// @description Checks that it is a compile-time error to declare a `mixin`
/// with no `base` modifier in a post-feature library `on` a platform library
/// class marked `final` and the superinterface chain goes through a pre-feature
/// library declaration
/// @author sgrekhov22@gmail.com
/// @issue 52078

import "versioning_pre_feature_lib.dart";

mixin MixinOnPreFeatureExtendsFinal on PreFeatureExtendsFinal {
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
  dynamic noSuchMethod(Invocation i) {}
}

mixin MixinOnPreFeatureImplementsFinal on PreFeatureImplementsFinal {
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
  dynamic noSuchMethod(Invocation i) {}
}

mixin MixinOnPreFeatureWithFinal on PreFeatureWithFinal {
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
  dynamic noSuchMethod(Invocation i) {}
}

main() {
  print(MixinOnPreFeatureExtendsFinal);
  print(MixinOnPreFeatureImplementsFinal);
  print(MixinOnPreFeatureWithFinal);
}