Is it intentional that you can replace the definition of a referred var, meaning in its original namespace. (An attempt to do this in Clojure balks.) I’m sure this gist reflects a bug, but it is hard to write a ticket that indicates which aspect is incorrect: https://gist.github.com/mfikes/8e2ef642ade1049ce135 (Also, see CLJS-1506—I checked and that change didn’t introduce the ability to replace the definition.)

that looks completely wrong to me

I'd be surprised if that was intentional behaviour

@mfikes: that gist seems like a bug to me

Clojure seems to cleanly handle the situation by completely disallowing it.