#define sb_rxres cx_u.cx_subst.sbu_rxres
#define sb_rx cx_u.cx_subst.sbu_rx
-#define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \
+#ifdef PERL_CORE
+# define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \
cx->sb_iters = iters, \
cx->sb_maxiters = maxiters, \
cx->sb_rflags = r_flags, \
rxres_save(&cx->sb_rxres, rx); \
(void)ReREFCNT_inc(rx)
-#define CxONCE(cx) ((cx)->cx_type & CXp_ONCE)
-
-#define POPSUBST(cx) cx = &cxstack[cxstack_ix--]; \
+# define POPSUBST(cx) cx = &cxstack[cxstack_ix--]; \
rxres_free(&cx->sb_rxres); \
ReREFCNT_dec(cx->sb_rx)
+#endif
+
+#define CxONCE(cx) ((cx)->cx_type & CXp_ONCE)
struct context {
union {