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The trav_t_init() function just initializes a traverser to the null item, indicated by a null pointer for bst_node.

65. <BST traverser null initializer 65> =
bst_t_init (struct bst_traverser *trav, struct bst_table *tree)
{ trav->bst_table = tree; trav->bst_node = NULL; trav->bst_height = 0; trav->bst_generation = tree->bst_generation; }

This code is included in 64 and 180.