1  #include <stdio.h>
       2  #include <stdlib.h>
       3  
       4  int common1[1];
       5  char common2[2];
       6  
       7  extern int bar ();
       8  
       9  int
      10  main ()
      11  {
      12    int i;
      13    if (bar () != -1)
      14      abort ();
      15    if (common1[0] != -1)
      16      abort ();
      17    for (i = 0; i < sizeof (common2)/ sizeof (common2[0]); i++)
      18      if (common2[i] != 0)
      19        abort ();
      20    printf ("PASS\n");
      21    return 0;
      22  }