#define scm_from_bool(x) (x ? SCM_BOOL_T : SCM_BOOL_F)
#define scm_from_int(x) SCM_MAKINUM (x)
#define scm_from_unsigned_integer(x) scm_uint2num (x)
+#define scm_from_unsigned(x) scm_uint2num (x)
#define scm_is_integer(x) SCM_INUMP (x)
#define scm_is_string(x) SCM_STRINGP (x)
#define scm_hash_table_p scm_vector_p