enum Color {
  Red,
  Green,
  Blue,
}

impl Color {
  fn display(self) {
    match self {
      Color::Red   => println!("Red!"),
      Color::Green => println!("Green!"),
      Color::Blue  => println!("Blue!"),
    }
  }
}

fn main() {
  let c = Color::Red;

  c.display();
  let c1 = c;
  c1.display();
  c.display()
}