,@(when netlogo-callback-fn
`((defun ,netlogo-callback-fn (,(intern "NETLOGO-CODE" *model-package*))
,(netlogo-callback-body prims))))))))
,@(when netlogo-callback-fn
`((defun ,netlogo-callback-fn (,(intern "NETLOGO-CODE" *model-package*))
,(netlogo-callback-body prims))))))))