lifetimed recursion

lifetimed_recursion.rs

use std::cell::RefCell;

struct S<'a> {
    value : RefCell<u64>,
    next  : Option<&'a Self>
}

impl<'a> S<'a> {
    fn new(value: u64, next: Option<&'a Self>) -> Self {
        S { value :RefCell::new(value), next }         
    }
    fn zeroize(&'a self) {
        *self.value.borrow_mut() = 0;
        if let Some(next) = self.next {
            next.zeroize()
        }
    }
}
fn main() {
    let s0 = S::new(100,None);
    let s1 = S::new(101,Some(&s0));
    // use reborrow trick https://www.reddit.com/r/rust/comments/464jge/lifetime_issues_turning_tail_recursion_into_a_loop/d032cu0?utm_source=share&utm_medium=web2x
    s1.zeroize();
    s1.zeroize();
}