Actually, I don’t think you could break a system in quite this way in Gentoo these days. Portage generally doesn’t remove packages during upgrades (certainly not unrelated ones that would break the depgraph!). It would have exited with (in this case) a message about version conflicts before changing any packages and left it for the user to sort out. Modern versions of portage do a pretty good job of keeping you from shooting yourself in the foot by accident, while leaving you with a lot of leeway for doing so on purpose.
Nor does Forth (which used to be a common choice for “first thing to bootstrap on this new chip architecture we have no real OS for yet”). Alas, they’re just not popular languages these days.