pkg/front_end/testcases/general/mixin_from_patch/origin_lib.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.
// @dart=2.9
class Class {
  external Class.patched();

  Class.unpatched();
}

mixin Mixin {}

class SubClass extends Class with Mixin {
  external SubClass.patched();

  SubClass.unpatched() : super.unpatched();
}