An Emacs Lisp version. Warning!! This will likely freeze your Emacs!!
(defun fib(n) (cond ((= n 0) 0) ((= n 1) 1) (t (+ (fib (- n 1)) (fib (- n 2))))))
UPDATE Just realized it counts as a Common Lisp version too
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An Emacs Lisp version. Warning!! This will likely freeze your Emacs!!
UPDATE
Just realized it counts as a Common Lisp version too