STATIC void S_simplify_sort(pTHX_ OP *o)
__attribute__nonnull__(pTHX_1);
-STATIC char* S_gv_ename(pTHX_ GV *gv);
+STATIC const char* S_gv_ename(pTHX_ GV *gv);
STATIC bool S_scalar_mod_type(pTHX_ const OP *o, I32 type);
STATIC OP * S_my_kid(pTHX_ OP *o, OP *attrs, OP **imopsp);
STATIC OP * S_dup_attrlist(pTHX_ OP *o);