The well rounded rustation

marker_traits.rs

use std::thread;

#[derive(Debug)]
struct MyBox(*mut u8);

unsafe impl Send for MyBox {}

fn main() {
    let mut x = 5;
    let test = MyBox(&mut x);
    let handle = thread::spawn(move || {
        println!("test={:?}", test);
    });
    handle.join().unwrap();
}