Rust sleep in main...

main.rs

/// playground link https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=4dc3d523c44e52a90368a3ada41340d5 
use std::time::Duration;
use std::thread;
use std::thread::sleep;
use std::sync::{Arc,RwLock};

fn main() {
    let story_behind_arc = Arc::new( RwLock::new( String::from("Once upon a time..." )));
    let story_ref = story_behind_arc.clone();

    let other_thread = thread::spawn( move || {
        // let story_ref_in_thread = story_arc.clone();
        let mut story = story_ref.write().unwrap();
        *story += "Everyone lived happly ever after.";
        
       sleep(Duration::new(0,100));
        
        println!("{}", story);
    });
    
    {
        let  story = story_behind_arc.read().unwrap();
        println!("{}", story);
    }
    let _result = other_thread.join();
    
    thread::sleep(Duration::new(0,200));
}