Here's my take using my clj-iter (http://github.com/nathell/clj-iter):

(defn partition-when
  [pred coll]
  (iter (for x in coll)
        (for p = (when x (pred x)))
        (for y initially () then (if p (list x) (cons x y)))
        (collect (reverse y) if p)
        (finally-collect (reverse y))))

Hopefully it's readable.

Best,
Daniel

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