1  #include <stdio.h>
       2  #include <stdlib.h>
       3  
       4  int foo;
       5  void bar (void);
       6  
       7  int
       8  main ()
       9  {
      10    if (foo != 0)
      11      abort ();
      12    foo = 200; 
      13    bar ();
      14    if (foo == 200)
      15      printf ("PASS\n");
      16    return 0;
      17  }