Macro rs_pmm_tools::remember_cond

macro_rules! remember_cond {
    (if $($t:tt)*) => { ... };
    (($($cond:tt)*) $blk_if:block) => { ... };
    (($($cond:tt)*) $blk_if:block else $blk_else:block) => { ... };
    (($($cond_acc:tt)*) $t_cond:tt $($t_rest:tt)*) => { ... };
}