display.rs

use std::fmt;

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

impl fmt::Display for Point {
  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    write!(f, "({}, {})", self.x, self.y)
  }
}

fn main() {
  let p = Point {x: 1, y: 2};
  println!("p: {}", p);
}