Not a macro, but does what you want:

(defn alt [& functions]
  (fn [tokens]
    (some #((force %) tokens) functions)))

;define sub-functions the same way

(defn a-meta-meta-function [c]
  (alt (delay (sub-function1 c)) (delay (sub-function2 c)) (delay (sub-
function3 c))))


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