Shared via Rust Playground

playground.rs

use std::ops::Deref;

struct Foo {
    a: u32
}

impl Foo {
    fn bar(&self) {
        println!("bar: a={}, address of self={:x}", self.a, self as *const Foo as usize);
    }
    
    fn lol(s: &Box<Self>) {
        let ptr = s.deref() as *const Foo;
        let a = unsafe {(*ptr).a};
        println!("lol: a={}, ptr={:x}", a, ptr as usize);
    }
}

fn main() {
    let a = Box::new(Foo {a: 5});
    a.bar();
    let ptr = Box::into_raw(a);
    println!("ptr: {:x}", ptr as usize);
    let b = unsafe { Box::from_raw(ptr) };
    Foo::lol(&b);
    b.bar();
}