Looks like a bug in reductions? The lazy-seq macro expects something
the implements ISeq, but the result of (+) is 0. Not sure if this is
the right fix, but it works.
(defn reductions
"Returns a lazy seq of the intermediate values of the reduction (as
per reduce) of coll by f, starting with init."
{:added "1.2"}
([f coll]
(lazy-seq
(if-let [s (seq coll)]
(reductions f (first s) (rest s))
[(f)])))
([f init coll]
(cons init
(lazy-seq
(when-let [s (seq coll)]
(reductions f (f init (first s)) (rest s)))))))
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