+ return PTR2UV(NULL);
+}
+#endif /* A_WORKAROUND_REQUIRE_PROPAGATION */
+
+STATIC SV *a_tag(pTHX_ UV bits) {
+#define a_tag(B) a_tag(aTHX_ (B))
+ SV *hint;
+ const PERL_SI *si;
+ UV cxreq;
+ unsigned char buf[sizeof(UV) * 2];
+ STRLEN len;
+
+ cxreq = a_require_tag();
+ A_ENCODE_UV(buf, cxreq);