Rust: How do you implement the Display trait?

1use std::fmt;
2
3struct Color {
4    r: u8,
5    g: u8,
6    b: u8,
7}
8
9impl fmt::Display for Color {
10    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
11        write!(f, "#{:02X}{:02X}{:02X}", self.r, self.g, self.b)
12    }
13}
14
15let color = Color { r: 255, g: 128, b: 0 };
16println!("{}", color);  // #FF8000