I am at the same time both amazed and utterly unsurprised that this was possible, given all the hullaballoo about TypeScript's type system being Turing complete. Having the grit to actually go through with it though? Bravo.
Is there a mainstream language where this still holds true?
From what I've seen most languages don't want to have a Turing complete type system, but end up with one anyway. It doesn't take much, so it's easy to end up with it accidentally and/or by adding conveniences that don't seem programmable, e.g. associated types and type equality.
