use std::net::{IpAddr::{self, V4, V6}, Ipv4Addr, Ipv6Addr};

fn main() {
    do_something(IpAddr::V4(Ipv4Addr::new(0,0,0,0)));
    do_something(IpAddr::V6(Ipv6Addr::new(0,0,0,0,0,0,0,0)));
}

fn do_something(v: IpAddr) {
    match v {
        V4(_x) => {
            println!("I'm an IPv4 Address!");
        },
        V6(_x) => {
            println!("I'm an IPv6 Address!");
        }
    }
}