1  /* PR debug/42728 */
       2  /* { dg-do compile } */
       3  /* { dg-options "-O1 -fcompare-debug" } */
       4  
       5  void
       6  foo (char *a)
       7  {
       8    char *b;
       9    for (; *a; a++)
      10      a = b++;
      11  }