1  extern void abort(void);
       2  extern void exit(int);
       3  
       4  struct baz { int a, b, c; };
       5  
       6  struct baz *c;
       7  
       8  void bar(int b)
       9  {
      10    if (c->a != 1 || c->b != 2 || c->c != 3 || b != 4)
      11      abort();
      12  }
      13  
      14  void foo(struct baz a, int b)
      15  {
      16    c = &a;
      17    bar(b);
      18  }
      19  
      20  int main()
      21  {
      22    struct baz a;
      23    a.a = 1;
      24    a.b = 2;
      25    a.c = 3;
      26    foo(a, 4);
      27    exit(0);
      28  }