{"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"debug!(\"add(r={:?},"}]}
        debug!("add(r={:?}, elem={:?})", r, elem);
    pub(crate) fn add_element(&mut self, r: N, elem: impl ToElementIndex) -> bool {
        elem.add_to_row(self, r)