Suppose I had code like:

((fn [rs] (take-last 3 rs)) (range 20000000))

This seems to run fine with no head holding.  But if I write something like:

(defn- log [f]
  (println "start")
  (f)
  (println "end"))

((fn [rs] (log #(take-last 3 rs))) (range 20000000))

Then this seems to hold on to the head.  Is there a way I can write code 
like this where I can add functions like log without the head being held?

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