May I recommend… vibemacsing?

Over the last couple of years, I&rsquo;ve been using my own eval test to gauge the&#xA;coding capabilities of frontier LLMs. Obviously, the test involves Emacs. The&#xA;test: write a function that marks the text rectangle under the cursor. At first&#xA;glance, it seems like a simple test, but in reality it has a whole series of&#xA;subtleties: it must use mark-rectangle and not a simple set-mark,…