Rc<RefCell<Value>> Error method not found in `&mut Rc<RefCell<Node>>`

Question

I am havin issues working with Rc and RefCell. when I call a function that exists in the Contained Struct, the compiler complains the method 'add_child' is not found.

When I fun the below code I get the error

  x.add_edge(jfk);    |    ^^^^^^^^ method not found in `&mut Rc<RefCell<Node>>

Directory structure:

       /graph
          /node.rs
          /mod.rs
        main.rs

main.rs

use std::borrow::BorrowMut;
fn main() {
    let dfw = Rc::new(RefCell::new(Node::new(1)));
    let jfk = Rc::new(RefCell::new(Node::new(2)));

    dfw.borrow_mut().add_child(jfk) // -> This method call causes the error
}

graph/node.rs

#[derive(Debug)]
pub struct Node {
    pub id: u32,
    pub children: Vec<Rc<RefCell<Node>>>,
}

impl Node {
    pub fn add_child(&mut self, node: Rc<RefCell<Node>>) {
        self.children.push(node);
    }
}

Answer 1

The main.rs was importing

use std::borrow::BorrowMut;

Removing this line fixed it.