@danie thanks for the report - it does seem odd, it's weird that a-ns is complaining about the alias since the alias is in a different namespace
captured here https://clojure.atlassian.net/browse/CLJS-3475
It was just check-as-alias-duplicates - https://github.com/clojure/clojurescript/pull/311 should fix it.
I did sign the CLA
thanks!!!