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fixed https://github.com/clojure/clojurescript/commit/4a3737bbe8de30081c9aef1ec15f8aae9065a1b6
Patch attached. Not printing to *err* was probably just an oversight; being able to rebind *cljs-ns* at a higher level enables user-facing REPL utilities other than cljs.repl/repl.
cljs.repl/repl
fixed https://github.com/clojure/clojurescript/commit/4a3737bbe8de30081c9aef1ec15f8aae9065a1b6