{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"assert!(row1.index()"}]}
        assert!(row1.index() < self.num_rows && row2.index() < self.num_rows);
    pub fn intersect_rows(&self, row1: R, row2: R) -> Vec<C> {
        let (row1_start, row1_end) = self.range(row1);