rem: serial_merge++;
add: serial_merge = true;
context: main (int argc, char **argv){  int optc, exit_status;  char default_delims[2], zero_delims[3];  program_name = argv[0];  setlocale (LC_ALL, "");  bindtextdomain (PACKAGE, LOCALEDIR);  textdomain (PACKAGE);  atexit (close_stdout);  have_read_stdin = 0;  serial_merge = 0;  delims = default_delims;  strcpy (delims, "\t");  strcpy (zero_delims, "\\0");  while ((optc = getopt_long (argc, argv, "d:s", longopts, NULL)) != -1)    {      switch (optc)	{	case 0:	  break;	case 'd':	  /* Delimiter character(s). */	  if (optarg[0] == '\0')	    optarg = zero_delims;	  delims = optarg;	  break;	case 's':	  serial_merge++;	  break;	case_GETOPT_HELP_CHAR;	case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);	default:	  usage (EXIT_FAILURE);	}    }  if (optind == argc)    argv[argc++] = "-";  delim_end = collapse_escapes (delims);  if (!serial_merge)    exit_status = paste_parallel (argc - optind, &argv[optind]);  else    exit_status = paste_serial (argc - optind, &argv[optind]);  if (have_read_stdin && fclose (stdin) == EOF)    error (EXIT_FAILURE, errno, "-");  exit (exit_status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);}