Cyc_eq Cyc_eqv Cyc_has_cycle Cyc_is_atomic Cyc_is_bignum Cyc_is_boolean Cyc_is_bytevector Cyc_is_char Cyc_is_complex Cyc_is_cond_var Cyc_is_cvar Cyc_is_double Cyc_is_eof_object Cyc_is_fixnum Cyc_is_immutable Cyc_is_integer Cyc_is_list Cyc_is_macro Cyc_is_mutex Cyc_is_null Cyc_is_number Cyc_is_opaque Cyc_is_pair Cyc_is_port Cyc_is_procedure Cyc_is_real Cyc_is_record Cyc_is_string Cyc_is_symbol Cyc_is_vector Cyc_is_vector_not_record_type Cyc_is_void_object equal equalp

Cyc_is_null #define Cyc_is_null (   o )    (make_boolean(o == NULL))