1  /* PR preprocessor/104147 */
       2  /* { dg-do run } */
       3  
       4  #define X(x,y) 	x y
       5  #define STR_(x) #x
       6  #define STR(x) 	STR_(x)
       7  const char *str =
       8  STR(X(Y,Y))
       9  #define Y()
      10  STR(X(Y,Y))
      11  #undef Y
      12  STR(X(Y,Y))
      13  #define Y()
      14  STR(X(Y,Y))
      15  STR(X(Y,
      16  Y))
      17  STR(X(Y
      18  ,Y))
      19  ;
      20  
      21  int
      22  main ()
      23  {
      24    if (__builtin_strcmp (str, "Y YY YY YY YY YY Y") != 0)
      25      __builtin_abort ();
      26    return 0;
      27  }