1  /* PR c/61854 */
       2  /* { dg-do run } */
       3  /* { dg-options "-std=c89" } */
       4  
       5  #define h(x) #x
       6  #define s(x) h(x)
       7  #define foo //
       8  
       9  int
      10  main (void)
      11  {
      12    if (__builtin_memcmp (s(foo), "//", 3) != 0)
      13      __builtin_abort ();
      14    return 0;
      15  }