// 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 are not compatible.
/// @author ngl@unipro.ru

class T1 {}
class T2 {}

abstract class I1 {
  T1 get n;
}
abstract class J1 {
  T2 get n;
}

abstract class I2 {
  T2 n(T2 p);
}
abstract class J2 {
  T1 n(T1 p);
}

abstract class I3 {
  T2 n(T1 p);
}
abstract class J3 {
  T2 n(T2 p1, T1 p2);
}

class B {}
class C {}

// The same name getters with different return types
mixin M1 on B, C implements I1, J1 {}
//    ^^
// [analyzer] unspecified
// [cfe] unspecified

// The same name getter and method with the same return types
mixin M2 on B, C implements I1, J2 {}
//    ^^
// [analyzer] unspecified
// [cfe] unspecified

// The same name methods with different return types
mixin M3 on B, C implements I2, J2 {}
//    ^^
// [analyzer] unspecified
// [cfe] unspecified

// The methods with the same return types and different parameters number
mixin M4 on B, C implements I3, J3 {}
//    ^^
// [analyzer] unspecified
// [cfe] unspecified

main() {
}