Hi, I'm working with Clojure for the first time and am following a post to 
implement a binary tree. However, the code results in an error that I've 
been unable to figure out. 

Post is here 
 http://macromancy.com/2014/04/09/data-structures-clojure-trees.html

Error is 


Exception in thread "main" java.lang.UnsupportedOperationException: nth not 
supported on this type: Symbol



The piece of code (if I paste into REPL) that causes the error is:


(definterface INode
  ...
  (insert [k v]))



If anyone can help me out with a hint/explanation, that would be awesome!


thanks!
jeff


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