use std::alloc::{alloc, dealloc, Layout};

unsafe fn use_1(it: *mut u8) {
    // some complicated logic
    dealloc(it, Layout::new::<u64>()); // we're done with it
}

unsafe fn use_2(it: *mut u8) {
    // some complicated logic
    dealloc(it, Layout::new::<u64>()); // we're done with it
}

fn main() {unsafe{
    let it = alloc(Layout::new::<u64>());
    *it = 0;

    // some complicated logic

    use_1(it);

    // some complicated logic

    use_2(it);

    // some complicated logic
}}