(defn accepts-arity? [n f]
(reduce
#(or
%1
(= n (count %2))
(and (= '& (last (butlast %2))) (>= n (- (count %2) 2))))
false
(:arglists (meta f))))
This works only if f has metadata -- anonymous lambdas don't but functions
defined using defn do.
I thought this up while reading some intro to clojure.contrib.monad that
mentioned that m-lift needs to be given an arity; it seems to me m-lift
could probably be implemented to use the arities in the function metadata,
when available, to make this optional.
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