What you can't do with lexical scoping.

lexical_scoping.clj

(defn record-adjunct
  "Records an adjunction performed by our rules."
  [phrase adjunct]
  (swap! adjunctions conj {:name name
                           :phrase phrase
                           :adjunct adjunct}))

(def fixed-trees
  "A map from tree filenames to their fixed versions."
  (into {} (for [[name tree] trees]
            [name (fix-tree tree)])))

;; in fixed-trees, we call fix-tree which calls transformo
;; which calls fix-adjunctiono which calls record-adjunct
;; the rules of lexical scoping do not allow the symbol `name'
;; in record-adjunct to refer to the local in fixed-trees