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This is the most arcane codebase I've seen. It's on par with co-dfns compiler. The frontend syntax also looks like a cross between Haskell and APL.

Я is a fascinating project. Looks like an esolang but is actually just Haskell.

> ho, he, yo, yo_, yo__, yo___, ... yo__________, ha

Is that some kind of meme I don't understand?

I mean, it kinda looks like all the combinations of a bunch of operators that can be combined.

I think it is related to category theory, namely "Yoneda" and Hom functors, but that's a wild guess