Should be fixed in Clojure 1.8.0-alpha2 and later, due to this ticket and
its attached patch: http://dev.clojure.org/jira/browse/CLJ-1761

Change was to force run! to return nil always.

Andy

On Mon, Sep 21, 2015 at 2:36 PM, Mike Rodriguez <[email protected]> wrote:

> The doc string for clojure.core/run! is:
>   "Runs the supplied procedure (via reduce), for purposes of side
>   effects, on successive items in the collection. Returns nil"
>
> However, it does not necessarily return nil.
>
> e.g.
>
> (run! #(do (println %) %) [1 2])
> 1
> 2
> ;= 2
>
> It just returns whatever the given function returns on the last element of
> coll.  I just found the fact that the doc string explicitly says it returns
> nil to be a little misleading.
>
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