slime/bin/tests/lexical_scope.slime

;; regular arguments

(define (make-counter)
  (let ((var 0))
    (lambda ()
      (mutate var (+ 1 var))
      var)))

(define counter1 (make-counter))

(assert (= (counter1) 1))

(define counter2 (make-counter))

(assert (= (counter2) 1))

(assert (= (counter2) 2))
(assert (= (counter1) 2))
(assert (= (counter1) 3))
(assert (= (counter2) 3))
(assert (= (counter2) 4))
(assert (= (counter2) 5))
(assert (= (counter1) 4))
(assert (= (counter1) 5))

;; key arguments

(define (make-key-counter)
  ((lambda (:keys var)
     (lambda ()
       (mutate var (+ 1 var))
       var))
   :var 0))


(define key-counter1 (make-key-counter))

(assert (= (key-counter1) 1))

(define key-counter2 (make-key-counter))

(assert (= (key-counter2) 1))

(assert (= (key-counter2) 2))
(assert (= (key-counter1) 2))
(assert (= (key-counter1) 3))
(assert (= (key-counter2) 3))
(assert (= (key-counter2) 4))
(assert (= (key-counter2) 5))
(assert (= (key-counter1) 4))
(assert (= (key-counter1) 5))

;; rest arguments will no be copied so we don't need to test them here