Core.async issues are reported on Clojure's 
JIRA: http://dev.clojure.org/jira/browse/ASYNC

pipeline does not have an incidental return value: it returns a channel 
which closes when there are no more transformation results, i.e. when the 
pipelining "process" is finished. There is no other way to get this 
information, especially when close? is false.

You're right this hurts threading, but sometimes you do need to monitor 
when pipelining is done. In fact, the pipe function does return the to 
channel like you suggest, and I had to write my own version that returned 
its inner go-loop because I needed to monitor the piping 
process. 
https://gist.github.com/favila/8e7ad6ea5b01bd7466ff#file-async-util-clj-L27


On Friday, April 17, 2015 at 2:33:58 PM UTC-5, Claudius Nicolae wrote:
>
> Since issue tracker for core.async is disabled on github, I'll spill this 
> here.
> I think "pipeline" should return the "to" channel, to make it 
> threading-friendly:
>
> (->> (range 100)
>        (a/to-chan)
>        (a/pipeline 10 (a/chan) (map inc))
>        (a/pipeline 2 (a/chan) (filter odd?)))
>
> Currently return value is incidental.
>

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