I unironically think it would be hilarious to write a borrow-checked version of Адрес. (The Soviet version of C - or rather C is a version of it, given that Адрес was first compiled in '55)
Not surprised. The Russian Wikipedia page on it is just a stub. The English one is actually longer.
I can't find any online introductions to it or compilers for it either, in English or написал по-Русски. Or Ukrainian for that matter, assuming I'd know it if I see it, although the Wikipedia page is longer.