+ /* Silently undo the ref - don't trigger destruction in the referent
+ * for a second time */
+ if (SvROK(ud.rsv) && SvRV(ud.rsv) == sv) {
+ SvRV_set(ud.rsv, NULL);
+ SvROK_off(ud.rsv);
+ --SvREFCNT(sv); /* silent */
+ }
+ SvREFCNT_dec_NN(ud.rsv);
+