use std::sync::{Mutex, mpsc::{self, Sender}};
use std::thread;
use std::time::Duration;

struct MySender(::std::sync::mpsc::Sender<()>);

impl Clone for MySender {
    fn clone(&self) -> Self {
        println!("clone");
        MySender(self.0.clone())
    }
}

impl Drop for MySender {
    fn drop(&mut self) {
        println!("Drop");
    }
}

fn main() {
    let mutex = Mutex::new(());
    let (tx, rx) = mpsc::channel();
    let tx = MySender(tx);
    thread::spawn(move || {
        let _ = tx.clone();
        thread::sleep(Duration::from_secs(5));
    });
    println!("first read");
    let _ = rx.recv_timeout(Duration::from_millis(500));
    println!("second read");
    let _ = rx.recv_timeout(Duration::from_millis(500));
}