enum E1 {
  element;

  void foo();
}

enum E2 {
  element;

  int get foo;
}

enum E3 {
  element;

  void set foo(int val);
}

abstract class InterfaceMethod {
  void foo();
}

enum E4 implements InterfaceMethod { element }

abstract class InterfaceGetter {
  int get foo;
}

enum E5 implements InterfaceGetter { element }

abstract class InterfaceSetter {
  void set foo(int val);
}

enum E6 implements InterfaceSetter { element }

mixin MethodImplementation {
  void foo() {}
}

enum E7 with MethodImplementation {
  element;

  void foo();
}

main() {}