You need to name the protocol before the method implementations.
That's why the "PersistentList cannot be cast to Symbol" message --
the compiler's expecting a protocol (or interface) symbol after [r].
And, as the examples on http://clojure.org/protocols show, you need to
define the different arit
I am having trouble getting syntax right when defining a protocol
function/method with multiple arities. When the defrecord is
evaluated I get:
java.lang.ClassCastException: clojure.lang.PersistentList cannot be
cast to clojure.lang.Symbol
[Thrown class java.lang.RuntimeException]
I have tried
