#define Nullop Null(OP*)
-/* Lowest byte of opargs */
+/* Lowest byte of PL_opargs */
#define OA_MARK 1
#define OA_FOLDCONST 2
#define OA_RETSCALAR 4
#define OASHIFT 12
-/* Remaining nybbles of opargs */
+/* Remaining nybbles of PL_opargs */
#define OA_SCALAR 1
#define OA_LIST 2
#define OA_AVREF 3