Subvec, however, isn't lazy. This is:
(defn split-when [pred coll]
(let [ipred (complement pred)
bits (iterate
(fn [[out coll]]
(let [[a b] (split-with ipred (rest coll))]
[(cons (first coll) a) b]))
[nil coll])]
(map #(first (first %))
(take-while #(seq (second (second %))) (map vector (rest bits) bits)))))
user=> (take 10 (split-when #(= 0 (rem % 3)) (iterate inc 1)))
((1 2)
(3 4 5)
(6 7 8)
(9 10 11)
(12 13 14)
(15 16 17)
(18 19 20)
(21 22 23)
(24 25 26)
(27 28 29))
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