Comment by Joker_vD

So... it's literally the open-closed principle, in its straw-man form? Where you actually can't change the old code but can only write new?

Well, it's ridiculous. IMO, of course but... seriously. One of the greatest (and even joyful) things about being a software developer is that you can change old code. Literally go there, rewrite things, and end up with a new version of code (which is presumably better in some respect).