title: Cannot "use" in clojurescript repl
body: <p>I type the following at the Clojurescript namespace.</p>
  
  <pre><code>cljs.user&gt; (use '[clojure.zip :only [insert-child]])
  
  WARNING: Use of undeclared Var cljs.user/use at line 1 
  "Error evaluating:" (use (quote [clojure.zip :only [insert-child]])) :as "cljs.user.use.call(null,cljs.core.vec([\"\\uFDD1'clojure.zip\",\"\\uFDD0'only\",cljs.core.vec([\"\\uFDD1'insert-child\"])]));\n"
  #&lt;TypeError: Cannot call method 'call' of undefined&gt;
  TypeError: Cannot call method 'call' of undefined
      at eval (eval at &lt;anonymous&gt; (http://localhost:3000/main.js:32728:147), &lt;anonymous&gt;:1:85)
      at eval (eval at &lt;anonymous&gt; (http://localhost:3000/main.js:32728:147), &lt;anonymous&gt;:6:3)
      at http://localhost:3000/main.js:32728:142
      at evaluate_javascript (http://localhost:3000/main.js:32741:4)
      at Object.callback (http://localhost:3000/main.js:32806:138)
      at goog.messaging.AbstractChannel.deliver (http://localhost:3000/main.js:31059:13)
      at goog.net.xpc.CrossPageChannel.deliver_ (http://localhost:3000/main.js:32164:14)
      at Function.goog.net.xpc.NativeMessagingTransport.messageReceived_ (http://localhost:3000/main.js:31732:13)
      at goog.events.Listener.handleEvent (http://localhost:3000/main.js:22590:26)
      at Object.goog.events.fireListener (http://localhost:3000/main.js:22924:21)
  nil
  </code></pre>
  
  <p>It seems to be stating that the 'use' method does not exist in the cljs.user namespace. This kind of makes sense to me, as Clojurescript itself cannot evaluate Clojure expressions. However, I know that Clojurescript has a clojure.zip namespace, I have used clojure.zip in the namespace declaration as <code>(:use [clojure.zip :only [insert-child]])</code>.</p>
  
  <p>How do I use the Clojurescript version of clojure.zip in the Clojurescript repl? </p>