#[derive(Debug)]
enum List {
    Cons(Rc<RefCell<i32>>, Rc<List>),
    Nil,
}

use crate::List::{Cons, Nil};
use std::cell::RefCell;
use std::rc::Rc;

fn main() {
    let value = Rc::new(RefCell::new(5));

    let a = Rc::new(Cons(Rc::clone(&value), Rc::new(Nil)));

    let b = Cons(Rc::new(RefCell::new(3)), Rc::clone(&a));
    let c = Cons(Rc::new(RefCell::new(4)), Rc::clone(&a));

    *value.borrow_mut() += 10;

    println!("a after = {:?}", a);
    println!("b after = {:?}", b);
    println!("c after = {:?}", c);
}

#[derive(Debug)]
enum List {
    Cons(RefCell<i32>, Rc<List>),
    Nil,
}

use crate::List::{Cons, Nil};
use std::{borrow::BorrowMut, cell::RefCell};
use std::rc::Rc;

fn main() {
    //let value = Rc::new(RefCell::new(5)); //old
    let value = RefCell::new(7);

    let a = Rc::new(Cons(value, Rc::new(Nil))); //value get's moved here

    let b = Cons(RefCell::new(3), Rc::clone(&a));
    let c = Cons(RefCell::new(4), Rc::clone(&a));

    if let Cons(rcn, _) = *a.as_ref().borrow_mut(){
        *rcn.borrow_mut() = 13;
    };
    if let Cons(rcn, _) = &*a{
        *rcn.borrow_mut() = 13;
    };
    
    println!("a after = {:?}", a);
    println!("b after = {:?}", b);
    println!("c after = {:?}", c);
}