BACKUP_STDERR_FILENO   45 gnulib-tests/test-freopen-safer.c   if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO
BACKUP_STDERR_FILENO   46 gnulib-tests/test-freopen-safer.c       || (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL)
BACKUP_STDERR_FILENO   72 gnulib-tests/test-getopt.c   if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO
BACKUP_STDERR_FILENO   73 gnulib-tests/test-getopt.c       || (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL)