core.async: "Can't recur here" in ClojureScript but OK in Clojure
With the latest core.async and ClojureScript (
The error in ClojureScript is
Workaround: replace
Another fun fact: ClojureScript's core.async lacks (at least) alt! (I did work around it by using alts! so it is not a show-stopper but still the difference is irritating and I fail to understand why it is missing.)
Oh, joy!
core.async "0.1.303.0-886421-alpha" and clojurescript "0.0-2202" as well as the older core.async "0.1.267.0-0d7780-alpha" and clojurescript "0.0-2173"), the following function compiles just fine in Clojure but fails in ClojureScript:
(defn cljs-cannot-recur! []
(go-loop [v nil]
(when-let [next-val (<! (timeout 300))]
(recur next-val))))
The error in ClojureScript is
clojure.lang.ExceptionInfo: Can't recur here at line 23 /my/path/core.cljs ::
{:tag :cljs/analysis-error, :file "/my/path/core.cljs", :line 23, :column 7}
core.clj:4403 clojure.core/ex-info
... // very long stacktrace of 0 value
Workaround: replace
(go-loop ..) with (go (loop ..)).Another fun fact: ClojureScript's core.async lacks (at least) alt! (I did work around it by using alts! so it is not a show-stopper but still the difference is irritating and I fail to understand why it is missing.)
Oh, joy!