1  /* PR c/21536 */
       2  /* { dg-do run } */
       3  /* { dg-options "-O2 -Wuninitialized" } */
       4  
       5  extern void abort (void);
       6  extern void exit (int);
       7  
       8  int
       9  main (void)
      10  {
      11    int a = 1;
      12    if (sizeof (*(++a, (char (*)[a])0)) != 2)
      13      abort ();
      14    exit (0);
      15  }
      16  
      17