use std::fmt::Debug;

#[derive(Debug)]
struct Opt<T: Debug>(Option<T>);

fn main() {
    let op: Opt<&str> = Opt(Some("Hello World!"));

    println!("Op: {:?}", op);
    let nick_bad = match op.0 {
        Some(ref nick) => nick.starts_with('!'),
        None => false,
    };
    println!("Bad nick ?: {}", nick_bad);
}