Nested defns cause incorrect error messages.

[HFellows]

(defn map-mod-2 [ls] (map (defn mod-2 [x] (mod x 2) ls)))
causes

Error: In function map, the first argument clojure.lang.Var must be a function but is a function.
Found in file may2015.clj on line 9 at character 1.
        corefns.corefns/map (corefns.clj line 37)
        intro.may2015/map-mod-2 (may2015.clj line 7)
        intro.may2015/eval8690 (may2015.clj line 9)
        intro.core/-main (core.clj line 114)

Which is a problem.

[HFellows]

It's not clear to me how to solve this. It's a failure of the preconditions on map.