/* Check that |bst_t_init()| works properly. */
struct bst_traverser init, first, last;
int *cur, *prev, *next;

bst_t_init (&init, tree);
bst_t_first (&first, tree);
bst_t_last (&last, tree);

cur = bst_t_cur (&init);
if (cur != NULL)
  {
    printf (" Inited traverser should be null, but is actually %d.\n",
            *cur);
    okay = 0;
  }

next = bst_t_next (&init);
if (next != bst_t_cur (&first))
  {
    printf (" Next after null should be %d, but is actually %d.\n",
            *(int *) bst_t_cur (&first), *next);
    okay = 0;
  }
bst_t_prev (&init);

prev = bst_t_prev (&init);
if (prev != bst_t_cur (&last))
  {
    printf (" Previous before null should be %d, but is actually %d.\n",
            *(int *) bst_t_cur (&last), *prev);
    okay = 0;
  }
bst_t_next (&init);