Perhaps this is more of a homebrew question, but I imagine someone here knows the answer. What is the best way to have two versions of emacs on OS X with homebrew? I need to be able to quickly switch between emacs 24 and 25 in order to properly test some packages I maintain, but it seems that switching between the two forces a full rebuild of emacs.
I figure I must be doing something wrong. So, what's the proper way to have two versions that I can quickly switch between? Is there some homebrew incantation that lets me unlink/link versions that are already built?