{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"//"}]}
        // (black-box) parser. However, if there is not EXACTLY ONE of these, something is wrong.
        // Another possibility is that we need to call out to parse some rust nonterminal
        let has_leftover_tokens = (bb_items.is_empty() && next_items.is_empty())