{"ast_node_type":"other","tokens":[{"end":40,"kind":"keyword","start":0,"text":"s"}]}
                s if *s == sym::not => {
                s if *s == sym::any => CfgExpr::Any(preds.into_boxed_slice()),
                    CfgExpr::Not(Box::new(preds.pop().unwrap_or(CfgExpr::Invalid)))