1  /* PR tree-optimization/42719 */
       2  /* { dg-do compile } */
       3  /* { dg-options "-O2 -ftracer -fcompare-debug" } */
       4  
       5  int *v;
       6  
       7  void
       8  foo (int a)
       9  {
      10    int i, j;
      11    for (j = i = a; i != -1; j = i, i = v[i])
      12      ;
      13    v[j] = v[a];
      14  }