TR
#define TR -B_COLS+1 /* top right */
#define TR(n, a) if (USE_TRACEF(n)) _nc_locked_tracef a
#define TR(n, a)
# undef TR
# define TR(n, a) if (_nc_tracing & (n)) { _tracef a ; putchar('\n'); }
# undef TR
# define TR(n, a) if (_nc_tracing & (n)) { _tracef a ; putchar('\n'); }
# define TR(n, a) { _tracef a ; putchar('\n'); }
#define TR 18 /* test register */
#define TR 0x1
#define TR 18 /* test register */
TR /* y */