I write a test to produce it,just run the fact several times quickly, and
we can see that (println "3" v (java.util.Date.) only be executed one time.
(defn handler [c]
(go
(let []
(loop []
(when-let [v (<! c)]
(println "2" (java.util.Date.))
(Thread/sleep 4000)
(println "3" v (java.util.Date.))
(recur))
(println "existing...")))))
(def c (chan))
(handler c)
(fact "test timeout"
(let []
(println "1" (java.util.Date.))
(go (>! c "hello"))
(alts!! [c (timeout 3000)])
(println "4" (java.util.Date.))
""
=> nil?))
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