class A1 {
  int get hashCode => 42;
}

enum E1 with A1 { element }

class A2 {
  int get values => 42;
}

enum E2 with A2 { element }

class A3 {
  int get index => 42;
}

enum E3 with A3 { element }

class A4 {
  bool operator ==(Object other) => true;
}

enum E4 with A4 { element }

mixin M5 {
  int get hashCode => 42;
}

enum E5 with M5 { element }

mixin M6 {
  int get values => 42;
}

enum E6 with M6 { element }

mixin M7 {
  int get index => 42;
}

enum E7 with M7 { element }

mixin M8 {
  bool operator ==(Object other) => true;
}

enum E8 with M8 { element }

abstract class A9 {
  int get index;
  int get hashCode;
  bool operator ==(Object other);
}

enum E9 with A9 { element }

mixin M10 {
  int get index;
  int get hashCode;
  bool operator ==(Object other);
}

enum E10 with M10 { element }

main() {}