rust_book_code 0.2.1

The code of rust book
Documentation 
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use crate::ch15::interior_mutability::List::{Cons, Nil};
use std::cell::RefCell;
use std::rc::Rc;

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

pub fn cons_list() {
    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!("value after {:?}", value);
    println!("a after {:?}", a);
    println!("b after {:?}", b);
    println!("c after {:?}", c);
}