{"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"crate::tt::TtElement::Subtree(subtree,"}]}
            crate::tt::TtElement::Subtree(subtree, subtree_iter) => {
            crate::tt::TtElement::Leaf(leaf) => builder.push(leaf.clone()),
                builder.extend_tt_dangerous(