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(defun Y (f)
(funcall
(lambda (g) (funcall g g))
(lambda (h)
(funcall f (lambda args (apply (funcall h h) args))))))
(defun fibo-impl (self)
(lambda (n)
(if (<= n 2)
1
(+ (funcall self (- n 1)) (funcall self (- n 2))))))
(defvar fibo (Y #'fibo-impl))
(assert (= 55 (funcall fibo 10)))
(defun generate-counter (init)
(let ((i init))
(lambda ()
(setq i (+ 1 i))
i)))
(let ((c (generate-counter 0)))
(assert (= 1 (funcall c)))
(assert (= 2 (funcall c)))
(assert (= 3 (funcall c))))
(let ((x 1)
(fn nil))
(setq fn
(lambda (x) (setq x 2)))
(funcall fn x)
(assert (= x 1)))
(assert-error
(let
((f
(lambda (x) (funcall f 1) x)))
(funcall f 1)))
(defun my-add (lambda (x y) (+ x y)))
(assert (= 3 (my-add 1 2)))
(defun my-add #'+)
(assert (= 3 (my-add 1 2)))
(defvar flag 0)
(defun func ()
(incq flag)
(incq flag))
(defun func
(let ((old-func #'func))
(lambda ()
(funcall old-func)
(incq flag))))
(func)
(assert (= 3 flag))
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