enum Message {
    Quit,
    Move { x: i32, y: i32 },
    Write(String),
    ChangeColor(i32, i32, i32),
}

impl std::fmt::Display for Message {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        match self {
            Message::Quit => write!(f, "Quit"),
            Message::Move { x, y } => write!(f, "Move to [{}, {}]", x, y),
            Message::Write(s) => write!(f, "{}", s),
            Message::ChangeColor(r, g, b) => write!(f, "r: {}, g: {}, b: {}", r, g, b),
        }
    }
}

fn main() {
    println!("{}", Message::Quit);
    println!("{}", Message::Move { x: 5, y: 10 });
    println!("{}", Message::Write(std::string::String::from("Hello")));
    println!("{}", Message::ChangeColor(255, 0, 0));
}