Why does rust-analyzer ignore value fields wrapped by RefCell

[greasycat]

Happy Holiday to anyone who's reading this.

So, I was trying to learn rust by implementing some data structures. I wrote the following passing code and trying to understand Rc<RefCell<T>>. I expect the old_node.borrow_mut() to return a RefMut<T> and rust-analyzer to provide 3 entries - prev,next,value. But it turns out that the value is not given. I wonder what's the logic behind this selection?

pub struct Node<T> {
    next: Option<Rc<RefCell<Node<T>>>>,
    prev: Option<Rc<RefCell<Node<T>>>>,
    value: T,
}

// ...........................................
    pub fn pop_front(&mut self) -> Option<T>
    where
        T: Clone,
    {
        self.head.take().map(|old_node| {
            match old_node.borrow_mut().next.take() {
                Some(next_node) => {
                    next_node.borrow_mut().prev.take();
                    self.head = Some(next_node);
                }
                None => {
                    self.tail.take();
                }
            }
            old_node.borrow().value.clone()
            // If no clone trait
            // Rc::try_unwrap(old_node).ok().unwrap().into_inner().value
        })
    }

Some extra information

- Version: 0.3.2675-standalone
  - Root directory: ~/WorkSpace/rust_dsa
  - Command: { "/home/rongfei/.local/share/nvim/mason/bin/rust-analyzer", "--log-file", "/tmp/nvim.rongfei/a1tgYJ/5-rust-analyzer.log" }
  - Settings: {
      ["rust-analyzer"] = {
        cargo = {
          allFeatures = true,
          buildScripts = {
            enable = true
          },
          loadOutDirsFromCheck = true
        },
        check = {
          command = "clippy",
          extraArgs = { "--no-deps" }
        },
        checkOnSave = true,
        diagnostics = {
          enable = true
        },
        files = {
          exclude = { ".direnv", ".git", ".jj", ".github", ".gitlab", "bin", "node_modules", "target", "venv", ".venv" },
          watcher = "client"
        },
        procMacro = {
          enable = true
        }
      }
    }

[ChayimFriedman2]

Do you have use std::borrow::Borrow?

[greasycat]

No, only use std::cell::RefCell; and use std::rc::Rc;