73     root: PackedOption<Node>,  field
84             root: None.into(),  in new()
91         self.root.is_none()  in is_empty()
96         self.root  in contains()
98             .and_then(|root| Path::default().find(key, root, &forest.nodes, comp))  in contains()
146         if let Some(root) = self.root.take() {  in clear()
147             forest.nodes.free_tree(root);  in clear()
159         if let Some(root) = self.root.expand() {  in retain()
160             path.first(root, &forest.nodes);  in retain()
166                 self.root = path.remove(&mut forest.nodes).into();  in retain()
184             root: self.root,  in iter()
209     root: &'a mut PackedOption<Node>,  field
223             root: &mut container.root,  in new()
232         self.root.is_none()  in is_empty()
247         self.root  in prev()
249             .and_then(|root| self.path.prev(root, self.pool).map(|(k, _)| k))  in prev()
266         match self.root.expand() {  in goto()
268             Some(root) => {  in goto()
269                 if self.path.find(elem, root, self.pool, self.comp).is_some() {  in goto()
281         self.root.map(|root| self.path.first(root, self.pool).0)  in goto_first()
296         match self.root.expand() {  in try_insert()
298                 let root = self.pool.alloc_node(NodeData::leaf(elem, SetValue()))?;  in try_insert()  localVariable
299                 *self.root = root.into();  in try_insert()
300                 self.path.set_root_node(root);  in try_insert()
303             Some(root) => {  in try_insert()
305                 if self.path.find(elem, root, self.pool, self.comp).is_none() {  in try_insert()
306                     *self.root = self.path.insert(elem, SetValue(), self.pool)?.into();  in try_insert()
320             *self.root = self.path.remove(self.pool).into();  in remove()
334         self.root.map(|root| self.pool.verify_tree(root, self.comp));  in verify()
349     root: PackedOption<Node>,  field
364         match self.root.take() {  in next()
365             Some(root) => Some(self.path.first(root, self.pool).0),  in next()