enum Color { Rgb(isize, isize, isize), Rgba(isize, isize, isize, isize), }

fn main() {
    let red: Color = Color::Rgb(255, 0, 0);
    match red {
        Color::Rgb(r, g, b) => { println!("rgb"); }
        Color::Hsl(h, s, l) => { println!("hsl"); }
        //~^ ERROR no variant
    }
}