{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"transcriber::transcribe(&rule.rhs,"}]}
            transcriber::transcribe(&rule.rhs, &match_.bindings, marker, call_site);
        let ExpandResult { value, err: transcribe_err } =
        ExpandResult { value: (value, idx.try_into().ok()), err: match_.err.or(transcribe_err) }