#![allow(unused_variables)]
fn main() {
    use std::sync::Arc;
    let x = Arc::new(3);
    let y = Arc::clone(&x);
    let x_thread = std::thread::spawn(|| Arc::into_inner(x));
    let y_thread = std::thread::spawn(|| Arc::into_inner(y));
    let x_inner_value = x_thread.join().unwrap();
    let y_inner_value = y_thread.join().unwrap();
    assert!(matches!((x_inner_value, y_inner_value), (None, Some(3)) | (Some(3), None)));
}