gistfile1.txt

enum key {
    key_a,
    key_b
}

enum event {
    quit,
    key(key)
}

fn handle(event: event) {
    alt event {
        quit { quit_game(); } 
        key(which) {
            alt which {
                key_a { io::println("a was pressed!"); 
                key_b { io::println("b was pressed!"); 
            }
        }
    }
}