1  extern void abort (void);
       2  
       3  union U
       4  {
       5    int i, j[4];
       6  };
       7  
       8  int main ()
       9  {
      10    union U t = {};
      11    int i;
      12  
      13    for (i = 0; i < 4; ++i)
      14      if (t.j[i] != 0)
      15        abort ();
      16  
      17    return 0;
      18  }