(if (typep class 'cl:built-in-class)
(sb-kernel:built-in-class-direct-superclasses class)
(let ((inherits (sb-kernel:layout-inherits
(sb-kernel:class-layout class))))
(if (typep class 'cl:built-in-class)
(sb-kernel:built-in-class-direct-superclasses class)
(let ((inherits (sb-kernel:layout-inherits
(sb-kernel:class-layout class))))