1  struct tree_common
       2  {
       3    int uid;
       4    unsigned int code : 8;
       5    unsigned int code2 : 8;
       6    unsigned external_attr : 1;
       7    unsigned public_attr : 1;
       8  
       9  };
      10  
      11  static int
      12  duplicate_decls (x)
      13       register struct tree_common *x;
      14  {
      15    if (x->external_attr)
      16      if (x->code)
      17        if (x->code2)
      18  	x->public_attr = 1;
      19  }