1  struct A
       2  {
       3    int i;
       4    long l;
       5  };
       6  
       7  struct B
       8  {
       9    int i;
      10  };
      11  
      12  struct C
      13  {
      14    int i;
      15    struct B b;
      16  };
      17  
      18  struct B foo (struct A a)
      19  {
      20    struct C *c = (struct C *) &a;
      21    return c->b;
      22  }
      23  void bar (struct A a, struct B b)
      24  {
      25    struct C *c = (struct C *) &a;
      26    c->b = b;
      27  }