#ifndef VERTICAL_GUARD//

   int main(){//
      char//
*unused1; int unused2 = 1              /
      1,

      #define VERTICAL_GUARD 1
      size = 0
      #include __FILE__
      #undef VERTICAL_GUARD
/**/
      ;
      return 0;
   }//

   #define VERTICAL_GUARD(define)

#elif VERTICAL_GUARD//

   | __LINE__

#endif//