1  /* PR preprocessor/103415 */
       2  /* { dg-do run } */
       3  /* { dg-options "-std=gnu99" { target c } } */
       4  /* { dg-options "-std=c++20" { target c++ } } */
       5  
       6  #define n(x, ...) = #__VA_OPT__(x##3)
       7  #define o(x, ...) #__VA_OPT__(x##__VA_ARGS__##9)
       8  const char *c n(1 2, 4);
       9  const char *d = o(5  6, 7	8);
      10  
      11  int
      12  main ()
      13  {
      14    if (__builtin_strcmp (c, "1 23")
      15        || __builtin_strcmp (d, "5 67 89"))
      16      __builtin_abort ();
      17    return 0;
      18  }