On Sun, Jan 30, 2011 at 4:03 PM, Aaron Cohen <aa...@assonance.org> wrote:
> 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
Interesting. I don't remember seeing this before.
As I suspected, :post causes problems with using recur, though this
fact is not documented anywhere. (I guessed it would, because it must
add an implicit (let [x (body ...)] (if-not (condition-on-x) (throw
...) x)) around the function body, or even around each separate return
site.)
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