1  /* { dg-do compile } */
       2  extern char *x;
       3  extern void foo (void);
       4  void f (char *s, char *se, char *mp, char *y)
       5  {
       6    while (s != se)
       7      {
       8        char *p;
       9        foo ();
      10        p = s + *mp;
      11        *y++ = *p;
      12        s = p;
      13      }
      14  
      15    x = s;
      16  }