1  struct rtx_def
       2  {
       3    int code;
       4  };
       5  
       6  main()
       7  {
       8    int tmp[2];
       9    struct rtx_def *r, s;
      10    int *p, *q;
      11  
      12    /* The alias analyzer was creating the same memory tag for r, p and q
      13       because 'struct rtx_def *' is type-compatible with 'int *'.  However,
      14       the alias set of 'int[2]' is not the same as 'int *', so variable
      15       'tmp' was deemed not aliased with anything.  */
      16    r = &s;
      17    r->code = 39;
      18  
      19    /* If 'r' wasn't declared, then q and tmp would have had the same memory
      20       tag.  */
      21    p = tmp;
      22    q = p + 1;
      23    *q = 0;
      24    tmp[1] = 39;
      25    if (*q != 39)
      26      abort ();
      27    exit (0);
      28  }