{"ast_node_type":"variable","tokens":[{"end":76,"kind":"keyword","start":0,"text":"let"}]}
                let src_lane = src.value_lane(fx, lane_idx).load_scalar(fx);
            for lane_idx in 0..std::cmp::min(src_lane_count, index_lane_count) {
                let index_lane = index.value_lane(fx, lane_idx).load_scalar(fx);