// Copyright (c) 2018, 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 A mixin declaration defines an interface. The interface for this
/// mixin declaration is equivalent to the interface of the class declared as:
///  abstract class A<X extends S, Y extends T> extends A$super<X, Y>
///    implements D, E { body' }
/// where body' contains abstract declarations corresponding to the instance
/// members of body of the mixin A.
/// It is a compile time error for the mixin declaration if this class
/// declarations would not be valid.
///
/// @description Checks that mixin declaration may have no implementation of all
/// declared methods and properties
/// @author sgrekhov@unipro.ru


abstract class I {
  int get i1;
  void i2();
  void set i3(int);
}
abstract class J {
  int get j1;
  void j2();
  void set j3(int);
}

abstract class B {
  int get b1;
  void b2();
  void set b3(int);
}
abstract class C {
  int get c1;
  void c2();
  void set c3(int);
}

mixin M on B, C implements I, J {}

main() {
}