The problem is probably too much nested laziness.

Try:
(reduce (fn [a b] (doall (map + [1 1] a))) [1 1] (range 1500))

Related:
https://groups.google.com/d/msg/clojure/-d8m7ooa4c8/pmaO7QubhosJ

Jonathan



On Wed, Mar 27, 2013 at 8:48 PM, Michael Klishin <
michael.s.klis...@gmail.com> wrote:

>
> 2013/3/27 larry google groups <lawrencecloj...@gmail.com>
>
>> The error says the type is clojure.lang.PersistentVector and not lazyseq
>>
>
> The error says it is clojure.lang.PersistentVector$ChunkedSeq. You can
> learn
> more about what chunking is for in
> http://clojure-doc.org/articles/language/laziness.html.
>
> Something in this code holds on to the seq's head.
> --
> MK
>
> http://github.com/michaelklishin
> http://twitter.com/michaelklishin
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