ISCAN_DISCARD
SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD;
SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD;
SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_DISCARD;
#define ISCAN_REP (ISCAN_MINDWELL | ISCAN_DISCARD)
if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_DISCARD)