+PERLVAR(Treg_maxiter, I32) /* max wait until caching pos */
+PERLVAR(Treg_leftiter, I32) /* wait until caching pos */
+PERLVARI(Treg_poscache, char *, Nullch) /* cache of pos of WHILEM */
+PERLVAR(Treg_poscache_size, STRLEN) /* size of pos cache of WHILEM */