1  int n;
       2  
       3  void foo (int i)
       4  {
       5    int a, b;
       6  
       7    if (!i)
       8      for (a = 1; a < 4; a++)
       9        if (a)
      10  	for (b = 1; b < 3; b++)
      11  	  foo (b);
      12  
      13    n++;
      14  }
      15