{"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"TokenTree::Sequence(span,"}]}
            TokenTree::Sequence(span, seq) => {
            TokenTree::Delimited(.., del) => check_lhs_no_empty_seq(sess, &del.tts)?,
                if is_empty_token_tree(sess, seq) {