why.rs

fn f() {
    let mut c: i64 = 1;
    let d: i64 = 2;
    let mut x: i64 = 3;

    unsafe {
        *(&mut x as *mut i64).sub(2) = 42;
    }

    println!("{c:?} {d:?} {x:?}");

    unsafe {
        *(&mut c as *mut i64).add(2) = 24;
    }

    println!("{c:?} {d:?} {x:?}");
}

fn main() {
    f();
}