A: It's a niche programming language the author is involved with. It's not widely-used enough to get its own Wikipedia page. It used to be called "Val". See: https://www.hylo-lang.org/
https://www.youtube.com/watch?v=5lecIqUhEl4
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Also is it a bit strange they wrote "rust" along all the article instead of "Rust"?
Anyway, that's pure bikeshedding. "function" is a full word in English, but almost 3x the length.
A: It's a niche programming language the author is involved with. It's not widely-used enough to get its own Wikipedia page. It used to be called "Val". See: https://www.hylo-lang.org/