rem: only_file_2 = 0;
add: only_file_2 = false;
context: main (int argc, char **argv){  int c;  program_name = argv[0];  setlocale (LC_ALL, "");  bindtextdomain (PACKAGE, LOCALEDIR);  textdomain (PACKAGE);  hard_LC_COLLATE = hard_locale (LC_COLLATE);  atexit (close_stdout);  only_file_1 = 1;  only_file_2 = 1;  both = 1;  while ((c = getopt_long (argc, argv, "123", long_options, NULL)) != -1)    switch (c)      {      case 0:	break;      case '1':	only_file_1 = 0;	break;      case '2':	only_file_2 = 0;	break;      case '3':	both = 0;	break;      case_GETOPT_HELP_CHAR;      case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);      default:	usage (EXIT_FAILURE);      }  if (optind + 2 != argc)    usage (EXIT_FAILURE);  exit (compare_files (argv + optind) == 0	? EXIT_SUCCESS : EXIT_FAILURE);}