1  typedef struct
       2  {
       3    union
       4      {
       5        int * aaa;
       6      } u;
       7  } t_a;
       8  
       9  typedef struct
      10  {
      11    unsigned bbb : 1;
      12  } t_b;
      13  
      14  typedef struct
      15  {
      16    int ccc;
      17    t_a ddd;
      18    t_b eee;
      19    int fff;
      20  } t_c;
      21  
      22  typedef struct t_d
      23  {
      24    t_c f1;
      25    t_c f2;
      26  } t_d;
      27  
      28  void foo (void)
      29  {
      30    t_d ggg;
      31    ggg.f1 = ggg.f2;
      32  }
      33