The comments on this ticket should answer your questions:
http://dev.clojure.org/jira/browse/CLJ-1038
Andy
On Nov 24, 2012, at 3:21 PM, Frank Siebenlist wrote:
> I'm confused by the "promised" behaviour of the documentation of deliver:
>
> ---
>
> user=> (doc deliver)
> -------------------------
> clojure.core/deliver
> ([promise val])
> Alpha - subject to change.
> Delivers the supplied value to the promise, releasing any pending
> derefs. A subsequent call to deliver on a promise will throw an exception.
> nil
> user=> (def p (promise))
> #'user/p
> user=> (deliver p "hi")
> #<core$promise$reify__6153@b24e8de: "hi">
> user=> (deliver p "hi")
> nil
> user=>
>
> ---
>
> I expected a thrown exception for the second deliver, but instead I get a
> returned nil…
>
> Has that behaviour changed maybe?
> Am I doing something wrong here?
>
> Thanks, Frank.
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