Macro def_kernel_sb_v0 

macro_rules! def_kernel_sb_v0 {
    (
        $t_a:ty, $t_ap:ty, $t_bp:ty, $t_c:ty, $t_s:ty,
        $no_partial:tt,
        $pack_fn:tt,
        $RS:tt,
        $MR:tt, $NR:tt
    ) => { ... };
}