use std::thread::spawn;

#[derive(Copy, Clone)]
struct EvilSend<T>(pub T);

unsafe impl<T> Send for EvilSend<T> {}
unsafe impl<T> Sync for EvilSend<T> {}

pub fn main() {
    let mut a = 0u32;
    let b = &mut a as *mut u32;
    let c = EvilSend(b);
    unsafe {
        let j1 = spawn(move || {
            *c.0
        });

        let j2 = spawn(move || {
            *c.0 = 64; //~ ERROR Data race
        });

        j1.join().unwrap();
        j2.join().unwrap();
    }
}