// 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.

// @dart = 2.9

/// @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 it is a compile-time error for the mixin declaration
/// if classes from implements clause contain methods with the same names but
/// different return types.
/// @author ngl@unipro.ru


class I {
  int i1() => 1;
}
class J {
  double i1() => 2.0;
}

class B {}
class C {}

mixin M on B, C implements I, J {}
//    ^
// [analyzer] unspecified
// [cfe] unspecified

main() {
}