Implementation of the do-until macro described in Fogus' Joy of Clojure using destructuring rather than explicit seq functions like first, second, and nnext. This macro executes all its clauses evaluating to true until it hits something falsey.

do-until.clj

(defmacro do-until [& clauses]
  (when-let [[first second & rest] clauses]
    (list 'when first
      (if second
        second
        (throw (IllegalArgumentException. "do-until requires an even number of forms")))
      (cons 'do-until rest))))