1  int
       2  sub1 (int i, int j)
       3  {
       4    typedef struct
       5    {
       6     int  c[i+2];
       7    }c;
       8    int x[10], y[10];
       9  
      10    if (j == 2)
      11      {
      12        memcpy (x, y, 10 * sizeof (int));
      13        return sizeof (c);
      14      }
      15    else
      16      return sizeof (c) * 3;
      17  }
      18  
      19  int
      20  main ()
      21  {
      22    typedef struct
      23    {
      24     int  c[22];
      25    }c;
      26    if (sub1 (20, 3) != sizeof (c)*3)
      27      abort ();
      28  
      29    return 0;
      30  }