#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::sync::{Arc, Mutex};
fn main() {
    let data = Arc::new(Mutex::new(vec![1, 2, 3]));
    let data_clone = data.clone();
    {
        let mut lock = data.lock().unwrap();
        lock.push(4);
    }
    assert_eq!(* data_clone.lock().unwrap(), vec![1, 2, 3, 4]);
}