(define-module math
  :exports
  (pi tau pow sqrt)

  (define pi 3.1415)
  (define tau (* 2 pi))
  (define (pow a b) (** a b))
  (define (sqrt a) (** a 0.5)))

(assert (= math::pi 3.1415))
(assert (= math::tau (* 2 math::pi)))


;; (tdefine-module 'math
;;   :exports
;;   '(pi tau pow sqrt)

;;   '(define pi 3.1415)
;;   '(define tau (* 2 pi))
;;   '(define (pow a b) (** a b))
;;   '(define (sqrt a) (** a 0.5)))