hi, i was wondering if there are functions in lisp that lets me check if an object or defstruct object is certtain defstruct object
as if
if i have
(defstruct (firstthing (:conc-name nil)) first second)
(defstruct (somethingelse (:conc-name nil)) blah blah)
and i instanciated
(setf thing (make-firstthing :first '(a) :second '(b)))
how do i check if thing is an instance of firstthing or somethingelse?