Hi,

I've run into the issue that when declaring a multimethod using
defmulti, the dispatch-function has to be not only declared, but must
actually be defined.

I.e. the following does not work:

(declare my-dispatch-fn)

(defmulti my-multi my-dispatch-fn) ; throws exception due to unbound
Var

(defn my-dispatch-fn [arg] :whatever)

I don't know whether this behaviour is intentional (due to the caching-
stuff with multimethods) or accidental; since the very reason for
declare is to work around this kind of ordering issues, it would be
nice if it would work in this case.
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