On Sun, Jan 30, 2011 at 12:12 PM, Ken Wesson <kwess...@gmail.com> wrote:
> On Sun, Jan 30, 2011 at 5:36 AM, Shantanu Kumar
> <kumar.shant...@gmail.com> wrote:
>> On Jan 30, 2:17 pm, Alexander Yakushev <yakushev.a...@gmail.com>
>> wrote:
>>> Why not use a constraint? It looks much cleaner.
>>>
>>> (defn hello [& {:keys [a b] :as input}]
>>> {:pre [(= (set (keys input)) #{:a :b})]}
>>> "hello")
>
> Where is this documented?
http://clojure.org/special_forms#toc10
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