[cosmojg]

Yes, the very website[1] on which you posted this comment is written in Scheme[2], for example.

[1] https://en.wikipedia.org/wiki/Hacker_News

[2] https://en.wikipedia.org/wiki/Arc_(programming_language)

[tedivm]

Both of the links you share contradict your statement. ARC isn't scheme, and the hacker news link you posted as a source doesn't mention scheme either.

[agumonkey]

It's a dialect on top of mzscheme iirc. You're right it's not in scheme per se but used as "runtime target".