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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