#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::marker::PhantomPinned;
use std::pin::Pin;
use std::pin::pin;
#[derive(Default)]
struct AddrTracker {
    prev_addr: Option<usize>,
    _pin: PhantomPinned,
}
impl AddrTracker {
    fn check_for_move(self: Pin<&mut Self>) {
        let current_addr = &*self as *const Self as usize;
        match self.prev_addr {
            None => {
                let self_data_mut = unsafe { self.get_unchecked_mut() };
                self_data_mut.prev_addr = Some(current_addr);
            }
            Some(prev_addr) => assert_eq!(prev_addr, current_addr),
        }
    }
}
fn main() {
    let tracker = AddrTracker::default();
    let mut ptr_to_pinned_tracker: Pin<&mut AddrTracker> = pin!(tracker);
    ptr_to_pinned_tracker.as_mut().check_for_move();
    ptr_to_pinned_tracker.as_mut().check_for_move();
}