LanguageFeatures/Super-mixins/compatible_t02.dart

// 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 Further, the interfaces B and C must be compatible. The on clause
/// introduces a synthetic interface combining B and C, call it A$super, which is
/// equivalent to the interface of a class declaration of the form:
///   abstract class A$super<X extends S, Y extends T> implements B, C {}
/// It is a compile-time error for the mixin declaration if the class declaration
/// above would not be valid.
///
/// @description Checks that it is a compile-time error for the mixin declaration
/// if the interfaces B and C are not compatible.
/// @author ngl@unipro.ru


class T1 {}
class T2 {}

abstract class B1 {
  T1 get n;
}
abstract class C1 {
  T2 get n;
}

abstract class B2 {
  T2 n(T2 p);
}
abstract class C2 {
  T1 n(T1 p);
}

abstract class B3 {
  T2 n(T1 p);
}
abstract class C3 {
  T2 n(T2 p1, T1 p2);
}

// The same name getters with different return types
mixin M1 on B1, C1 {}
//    ^^
// [analyzer] COMPILE_TIME_ERROR.INCONSISTENT_INHERITANCE
// [cfe] Class 'B1 with C1' inherits multiple members named 'n' with incompatible signatures.

// The same name getter and method with the same return types
mixin M2 on B1, C2 {}
//    ^^
// [analyzer] COMPILE_TIME_ERROR.INCONSISTENT_INHERITANCE_GETTER_AND_METHOD
// [cfe] Can't inherit members that conflict with each other.

// The same name methods with different return types
mixin M3 on B2, C2 {}
//    ^^
// [analyzer] COMPILE_TIME_ERROR.INCONSISTENT_INHERITANCE
// [cfe] Class 'B2 with C2' inherits multiple members named 'n' with incompatible signatures.

// The methods with the same return types and different parameters number
mixin M4 on B3, C3 {}
//    ^^
// [analyzer] COMPILE_TIME_ERROR.INCONSISTENT_INHERITANCE
// [cfe] Class 'B3 with C3' inherits multiple members named 'n' with incompatible signatures.

main() {
}