REPL require results in warnings to be emitted twice

Run through the Quick Start and go down through to the Browser REPL portion (https://github.com/clojure/clojurescript/wiki/Quick-Start#browser-repl), but exclude the :watch option from repl.clj.

Then further down, where the new symbol is introduced

instead cause some duplicate symbols to be introduced in order to provoke compiler warnings:

Then evaluate the require statement in the tutorial and observe that the warnings are emitted twice: