{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"tt::DelimiterKind::Parenthesis"}]}
                    tt::DelimiterKind::Parenthesis => {
                TtElement::Subtree(subtree, mut subtree_iter) => match subtree.delimiter.kind {
                        let (separator, kind) = parse_repeat(src)?;