can anyone explain why this doesn't work?

(defprotocol arrow
  (>>> ([f g] [f g & fs]) "compose left to right"))

(extend clojure.lang.Fn
  arrow
  {:>>> (fn
          ([f g] #(g (f %)))
          ([f g & fs] (apply >>> (>>> f g) fs)))})

(>>> inc inc inc)

; gives this error:
; java.lang.IllegalArgumentException: Wrong number of args passed to:
user$eval--21$fn--23$G--10 (test.clj:3)

this does work, however:
(>>> inc inc)
(>>> inc inc inc)

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