Code shared from the Rust Playground

playground.rs

use std::sync::{RwLock, Arc};
use std::option::Option;

#[derive(Debug)]
struct Tomato{
    salad: std::string::String,
}

fn main() {
    let optional_rwlock: Arc<RwLock<Option<Tomato>>> = Arc::new(RwLock::new(None));
    
    let clone = optional_rwlock.clone();
    
    clone.read().ok().and_then(|option|{
        println!("{:?}: {:?}", option, *option);
        Some(1)
    });
    
    optional_rwlock.write().ok().and_then(|mut option|{
        *option = Some(Tomato { salad: "Spaghett".to_string() });
        println!("{:?}: {:?}", option, *option);
        Some(1)
    });
    
    clone.read().ok().and_then(|option|{
        println!("{:?}: {:?}", option, *option);
        Some(1)
    });
    
    optional_rwlock.write().ok().and_then(|option|{
        println!("{:?}: {:?}", option, *option);
        Some(1)
    });
}