Takes a fn f and returns a fn that takes the same arguments as f, has the same effects, if any, and returns the opposite truth value.
; clojure/core.clj:827 (defn complement [f] (fn ([] (not (f))) ([x] (not (f x))) ([x y] (not (f x y))) ([x y & zs] (not (apply f x y zs)))))
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