Clojurescript core.async go block incorrectly handles records returned from tagged literals

Fri, 27 Aug 2021 18:53:31 +0000

In clojurescript, I have a data reader that returns a record from a tagged literal:

(ns x.x)

(defrecord X [y])

(defn make-x [y] (->X y))

data_readers.cljc:

{x x.x/make-x}

This doesn't work correctly inside of go blocks:

(println "outside of go:" #x"a")
(go
  (println "inside of go:" (<! (go #x"b"))))

Results in:

outside of go: #x.x.X{:y a}
inside of go: {:y b}

@hiredman on the clojurians slack pointed out the issue:

what is happening is here
https://github.com/clojure/core.async/blob/master/src/main/clojure/cljs/core/async/impl/ioc_macros.clj#L403

map? is returning true so it is compiling your record as a map

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