*slime-repl clojure*

sexpbot.gist> (defprotocol Delete
  "A protocol for deleting elements."
  (internal-delete [this]
    "Deletes this vertex or edge."))

(extend-protocol Delete
  Integer (internal-delete [v] (.delete v))
  Double   (internal-delete [e] (.delete e)))

(defn delete!
  "Deletes the graph element ge and more elements."
  [ge & more]
  (internal-delete ge) ;; ERROR HERE
  (when (seq more)
    (recur (first more) (next more))))
#'sexpbot.gist/delete!