Howto extract Option from Cell of type usize

extract_option_cell.rs

// How to extract Option from Cell
pub struct X {
  replacement: Cell<Option<usize>>,
...
}

fn get_transition_node(&self) -> usize {
    if let Some(rep) = &*self.replacement.borrow() {
        let repl = rep.borrow();
        return repl.data().borrow().node.id();
    }
  0
}