Yeah, I'm sure deftype does nothing. (deftype option (subtype) "The type of a value that is either nil or a value of SUBTYPE." `(or null ,subtype))

Yeah, I'm sure deftype does nothing. (deftype option (subtype) "The type of a value that is either nil or a value of SUBTYPE." `(or null ,subtype)) (defun* get-latest-statement ((account account)) "If any statements have been made on the ACCOUNT, returns the latest. Otherwise returns nil." (:returns (option statement)) (car (last (account-statements account)))) I like defstar, it's a neat package.