fst_node
traverse_state_t *tsp, struct fst_node *pnp,
struct fst_node pn, en; /* parent and entry nodes */
traverse_state_t *tsp, struct fst_node *pnp, dent_arg_t *darg)
struct fst_node en; /* entry node */
struct fst_node pn, en; /* parent and entry nodes */