CTEMP
#define istemp(n) ((n)->csub == CTEMP)
static Cell tempcell ={ OCELL, CTEMP, 0, EMPTY, 0.0, NUM|STR|DONTFREE, NULL, NULL };
res->csub = CTEMP; /* result values are temporary */
t->csub = CTEMP;
t->csub = CTEMP;
t->csub = CTEMP;