use std::sync::Arc;
unsafe fn test<A>(
    arg: Arc<A>,
) {
    println!("{:#x}", &arg as *const _ as u64);
    let arg1_pointer = core::mem::transmute::<Arc<A>, u64>(arg);
    println!("{:#x}", arg1_pointer);
}

fn main() {
    let a = Arc::new(12);
    println!("{:p}", a);
    unsafe { test(a) };
}