+ao_scheme_vector_display(ao_poly v);
+
+struct ao_scheme_vector *
+ao_scheme_vector_alloc(uint16_t length, ao_poly fill);
+
+ao_poly
+ao_scheme_vector_get(ao_poly v, ao_poly i);
+
+ao_poly
+ao_scheme_vector_set(ao_poly v, ao_poly i, ao_poly p);
+
+struct ao_scheme_vector *
+ao_scheme_list_to_vector(struct ao_scheme_cons *cons);
+
+struct ao_scheme_cons *
+ao_scheme_vector_to_list(struct ao_scheme_vector *vector);
+
+extern const struct ao_scheme_type ao_scheme_vector_type;
+
+/* prim */
+void (*ao_scheme_poly_write_func(ao_poly p))(ao_poly p);
+void (*ao_scheme_poly_display_func(ao_poly p))(ao_poly p);
+
+static inline void
+ao_scheme_poly_write(ao_poly p) { (*ao_scheme_poly_write_func(p))(p); }
+
+static inline void
+ao_scheme_poly_display(ao_poly p) { (*ao_scheme_poly_display_func(p))(p); }