{"ast_node_type":"variable","tokens":[{"end":30,"kind":"keyword","start":0,"text":"if"}]}
        if let Err(err) = self
    pub(super) fn eat_to_tokens(&mut self, closes: &[ExpTokenPair<'_>]) {
            .parse_seq_to_before_tokens(closes, &[], SeqSep::none(), |p| Ok(p.parse_token_tree()))