The right fix would be (member position slots :key #'slot-definition-location), or rather, replace the whole thing with just (slot-definition-name (find position (layout-slot-list (layout-of instance)) :key #'slot-definition-location))
The right fix would be (member position slots :key #'slot- definition- location) , or rather, replace the whole thing with just n-name definition- location) )
(slot-definitio
(find position (layout-slot-list (layout-of instance))
:key #'slot-