regnext
scan = regnext(scan);
next = regnext(s);
STATIC char *regnext __P((char *));
if (OP(regnext(scan)) == END) { /* Only one top-level choice. */
for (; scan != NULL; scan = regnext(scan))
for (br = ret; br != NULL; br = regnext(br))
temp = regnext(scan);
next = regnext(scan);