Code shared from the Rust Playground

playground.rs

use std::fmt;

struct Rect {
    width: f32,
    height: f32,
}

impl fmt::Display for Rect {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "Rect[width: {}; height: {}]",
                self.width, self.height)
    }
}

fn main() {
    let c = Rect{width: 2.0, height: 5.0};
    println!("c = {}", c);
}