$ lein new replbuiltin && cd replbuiltin
$ sed -Ee 's,.0",.0"][org.clojure/tools.nrepl "0.2.2",' < project.clj > p
&& mv -f p project.clj
$ lein deps
$ cat <<EOF > src/replbuiltin/core.clj
(ns replbuiltin.core
  (:use [clojure.tools.nrepl.server :only [start-server stop-server]]))

(defn foo [x] x)

(defn -main
  "I'm showing FooBar how to embed an nrepl!"
  [& _]
  (let [repl-server (start-server :port 42042)]
   (Thread/sleep 60000)))
EOF

$ lein run -m replbuiltin.core &
$ lein repl :connect 42042
user=> (in-ns 'replbuiltin.core)
replbuiltin.core=> (foo 42)
42

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