(expect "do - simple example"
        (equal (do ((n 1)) (t n)) 1))

(defun range (start end)
  (do ((i (- end 1) (- i 1))
       (lst (list) (cons i lst)))
      ((< i start) lst)))

(expect "do - range function"
        (equal (let ((lst (range 1 4)))
                 (comment lst)
                 lst)
               (list 1 2 3)))

(expect "do - has implicit block nil"
        (equal 'ok
               (block nil
                      (do () (t)
                          (return 'fail))
                      'ok)))