{"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"CfgExpr::Invalid"}]}
                CfgExpr::Invalid => Self { negate: true, var: None },
            CfgExpr::Not(expr) => match *expr {
                CfgExpr::Atom(atom) => Self { negate: true, var: Some(atom) },