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

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