(import scheme chicken)

(define strange-warning (lambda (sym options)
	(let ((el (assq sym options)))
		(if (pair? el)
			(if (list? el)
				"list"
				(cdr el) ; <== strange warning here
			)
			"found nothing"
		)
	)
))

(define no-warning (lambda (sym options)
	(let ((el (assq sym options)))
		(if (list? el)
			"list"
			(if (pair? el)
				(cdr el) ; <== no warning here
				"found nothing"
			)
		)
	)
))

(define also-no-warning (lambda (sym options)
	(define el (assq sym options))
	(if (pair? el)
		(if (list? el)
			"list"
			(cdr el) ; <== also no warning here
		)
		"found nothing"
	)
))

(print (strange-warning 'a '((a "a"))))
(print (no-warning 'a '((a "a"))))
(print (also-no-warning 'a '((a "a"))))