exit (EXIT_FAILURE);
xexit (EXIT_FAILURE);
as_assert (file, line, fn)     const char *file, *fn;     int line;{  as_show_where ();  fprintf (stderr, "Internal error!\n");  fprintf (stderr, "Assertion failure");  if (fn)    fprintf (stderr, " in %s", fn);  fprintf (stderr, " at %s line %d.\n", file, line);  fprintf (stderr, "Please report this bug.\n");  exit (EXIT_FAILURE);}