{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"(tt::TopSubtree::empty(tt::DelimSpan::from_single(call_site)),"}]}
            (tt::TopSubtree::empty(tt::DelimSpan::from_single(call_site)), None),
        ExpandResult::new(
            ExpandError::new(call_site, ExpandErrorKind::NoMatchingRule),