Code shared from the Rust Playground

playground.rs

trait Json {
    fn to_string(&self) -> String;
}

trait Xml {
    fn to_string(&self) -> String;
}

#[derive(Debug)]
struct Point2 {
    x: i32,
    y: i32
}

impl Xml for Point2 {
    fn to_string(&self) -> String {
        format!("<point x=\"{}\" y=\"{}\" />", self.x, self.y)
    }
}

impl Json for Point2 {
    fn to_string(&self) -> String {
        format!("{{\"x\": {}, \"y\": {}}}", self.x, self.y)
    }
}

// Prints:
// >> Point2 { x: 4, y: 5 }
// >> <point x="4" y="5" />
// >> {"x": 4, "y": 5}
// >> <point x="4" y="5" />
// >> {"x": 4, "y": 5}
fn main() {
    let p = Point2 { x: 4, y: 5 };
    println!("{:?}", p);
    println!("{}", Xml::to_string(&p));
    println!("{}", Json::to_string(&p));
    println!("{}", (&p as &Xml).to_string());
    println!("{}", (&p as &Json).to_string());
}