}
char * err = "Too much wrapping in mv_yx_in_dir_legal().";
exit_err( INT8_MIN == wrap_west_east || INT8_MIN == wrap_north_south
}
char * err = "Too much wrapping in mv_yx_in_dir_legal().";
exit_err( INT8_MIN == wrap_west_east || INT8_MIN == wrap_north_south