#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::fmt;
struct Length(i32);
impl fmt::Pointer for Length {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let ptr = self as *const Self;
        fmt::Pointer::fmt(&ptr, f)
    }
}
fn main() {
    let l = Length(42);
    println!("l is in memory here: {l:p}");
    let l_ptr = format!("{l:018p}");
    assert_eq!(l_ptr.len(), 18);
    assert_eq!(& l_ptr[..2], "0x");
}