Using a simple build.clj appended onto the cljs hello world guide:
Results in this stacktrace (note that this will work with advanced optimizations):
Just adding a note this is not regression but something which was never properly supported.
Previous comment is not correct, and the issue may be missing information. This should definitely work, otherwise build nor cljs.closure/build would pass nil in the 0-arity cases.
Was able to create a minimal case and added as test to a branch - this does appear to be some kind of regression.