ca.clj

  :async-259
  (System/setProperty "clojure.core.async.go-checking" "true")
  (Boolean/getBoolean "clojure.core.async.go-checking")

  (require '[clojure.core.async :as async])
  (require '[clojure.core.async.impl.dispatch :as d])

  @#'clojure.core.async.impl.go/go-checking

  (let [c (async/chan 1)]
    (async/go (async/>!! c 100)))

  (macroexpand-1 '(async/go (async/>!! (async/chan 1) 100)))