Code shared from the Rust Playground

playground.rs

struct S {
    x: Box<[u8]>
}
fn main() {
    let x = S {x: Box::new([0u8; 32])};
    crossbeam::scope(|s| {
        s.spawn(|_| {
            println!("{:?}", x.x);
        });
        println!("{:?}", x.x);
    }).unwrap();
}