/* Destroys |new| with |pbst_destroy (new, destroy)|,
   first initializing right links in |new| that have
   not yet been initialized at time of call. */
static void
copy_error_recovery (struct pbst_node *q,
                     struct pbst_table *new, pbst_item_func *destroy)
{
  assert (q != NULL && new != NULL);

  for (;;)
    {
      struct pbst_node *p = q;
      q = q->pbst_parent;
      if (q == NULL)
        break;

      if (p == q->pbst_link[0])
        q->pbst_link[1] = NULL;
    }

  pbst_destroy (new, destroy);
}