{"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"if"}]}
        if *sym == sym::true_ || *sym == sym::false_ {
        let (CfgAtom::Flag(sym) | CfgAtom::KeyValue { key: sym, .. }) = &atom;
            tracing::error!("cannot insert `true` or `false` to cfg");