use std::thread;
fn main() {

    let mut th:thread::JoinHandle<()>;

    for m in 1..10 {
        let t = thread::spawn(move || {
            println!("{}", m);
        });
        if m==1 {
            th = t;
        }
        else {
            let _ = t.join();
        }
    }

    th.join();

}