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def'd haml-engine cannot be eval'd via the REPL?

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(ns blog.core
(:require [ring.adapter.jetty :as jetty]
[ :as io]
[clojure.contrib.classpath :as cp])
(:import [org.jruby.embed ScriptingContainer LocalContextScope]))
(def scripting-container (ScriptingContainer. LocalContextScope/THREADSAFE))
(defn execute-rb [rb-string]
(. scripting-container runScriptlet rb-string))
(gem-require "rubygems"
(gem-require "haml-3.1.3/gem/haml")
(def haml-engine (execute-rb "Haml::Engine")) ;; C-x C-e from the REPL says HAML is not defined
;; However, if I type this line out in the REPL, it works. Puzzling.
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