{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"debug_assert!(is_ancestor_or_self_of_element(&old,"}]}
        debug_assert!(is_ancestor_or_self_of_element(&old, &self.root));
        let old = old.syntax_element();
        self.changes.push(Change::Replace(old.syntax_element(), Some(new.syntax_element())));