Ronin: Implement Append using user-space functions.

append-implementation.lisp

(def y ())

(defn identity (x) x)

(defn copy-list 
  (xs) 
  (map xs identity))

(defn append 
  (xs item)
  (set (copy-list xs) (len xs) item))

(debug (append (append y 2) 1))
(debug y)