Why does this work?
(defrecord R [k])
(extend-protocol P R (p [{:keys [k]}] k))
On Fri, Apr 30, 2010 at 2:52 PM, Sean Devlin <francoisdev...@gmail.com>wrote:
> I think you have your destructuring backwards.
>
> You fn should probably be (fn [{k :keys}] k)
>
> For example,
>
> user=> ((fn [{k :keys}] k) {:keys "Awesome"})
> "Awesome"
>
>
>
> On Apr 30, 2:46 pm, russellc <russell.christop...@gmail.com> wrote:
> > Should this compile?
> >
> > (defprotocol P (p [this]))
> > (defrecord R [k] P (p [{:keys [k]}] k))
> >
> > java.lang.ClassCastException: clojure.lang.PersistentArrayMap cannot
> > be cast to clojure.lang.Symbol
> >
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