alloc_bignum assign_double bignum_value bn_cmp_type boolean boolean_desc boolean_f boolean_t bytevector c_opaque closure closure0 closure1 closureN cond_var cvar Cyc_EOF defprimitive defsymbol double_value forward function_type function_type_va integer_value list macro make_c_opaque make_cell make_cvar make_double make_empty_bytevector make_empty_vector make_pair make_port make_string make_string_noalloc make_string_with_len mclosure0 mclosure1 mmacro mutex object object_tag opaque_ptr pair prim prim_name primitive quote_void set_pair string_len string_str symbol symbol_desc tag_type type_of vector

type_of #define type_of (   obj )    (((pair_type *) obj)->tag) Access an object's tag.