{"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"for"}]}
    for lane_idx in start_lane..lane_count {
        if let Some(acc) = acc { (acc, 0) } else { (val.value_lane(fx, 0).load_scalar(fx), 1) };
        let lane = val.value_lane(fx, lane_idx).load_scalar(fx);