1  /* { dg-do compile } */
       2  
       3  char *a;
       4  void
       5  fn1 ()
       6  {
       7    char *p = a;
       8    while (p && *p != '\0')
       9      {
      10        while (*p == '\t')
      11  	*p++ = '\0';
      12        if (*p != '\0')
      13  	p = 0;
      14      }
      15  }