Lisp Sort

lisp-sort.el

(let ((a (list 2 1))) 
  (sort a #'<)        
  a)                  
;; => (2)    

(let ((a (list 1 2))) 
  (sort a #'<)        
  a)                  
;; => (1 2)

;; ちゃんとsort結果を束縛しような！
(let* ((a (list 2 1))
       (b (sort a #'<)))
  b)
;; => (1 2)