Inserts the item as the left sibling of the node at this loc, without moving
; clojure/zip.clj:153 (defn insert-left [loc item] (let [[node {l :l :as path}] loc] (if (nil? path) (throw (new Exception "Insert at top")) (with-meta [node (assoc path :l (conj l item) :changed? true)] ^loc))))
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