Method visitor

src/strings/tst.rs:234–239

(p: Option<NonNull<Node<T>>>)

impl<T> Drop for TST<T> {
    fn drop(&mut self) {
        fn visitor<T>(p: Option<NonNull<Node<T>>>) {
            if let Some(p) = p {
                let subtries = unsafe { Box::from_raw(p.as_ptr()).subtries };
                subtries.iter().for_each(|it| visitor(*it));
            }
        }

        let root = self.root.take();
        visitor(root);