Enumerate without PartialEq using match

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• If we don't have PartialEq on an enum and we don't want to add it or cannot add it (e.g. because it was supplied by an external crate) we can use match:

examples/enums/colors-match/src/main.rs

#[allow(dead_code)]
enum ColorName {
    Red,
    Green,
    Blue,
    White,
    Black,
}

fn main() {
    let background = ColorName::Black;
    let foreground = ColorName::White;
    let ink = ColorName::Black;
    let frame = ColorName::Red;

    for color in [background, foreground, ink, frame] {
        match color {
            ColorName::White => println!("white: #FFFFFF"),
            ColorName::Red => println!("red: #FF0000"),
            _ => println!("other"),
        }
    }
}

other
white: #FFFFFF
other
red: #FF0000