struct WrapPtr(*mut u32);

impl std::ops::Deref for WrapPtr {
    type Target = *mut u32;
    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

fn main() {
    let mut x = 0u32;
    {
        let wrap = WrapPtr(&mut x);
        unsafe {
            **wrap = 6;
        }
    }
    assert_eq!(x, 6);
}