> a Rust program which relies on this for a constant
That's a bold claim for a tool that doesn't even have a Wikipedia entry.
Edit: or a subreddit.
I would implore you to open your mind up to resources that aren't popular social media because that's where the real gold/value is in development/engineering.
I'm not claiming to be "one of the absolutely most valuable and greatest tools available" though. (Well, maybe the "greatest tool" part ;-) And if someone else claimed that about me, I'd think that either there was something very wrong with them, or that one of my parents had started using alt accounts I didn't know about.
Considering some of the software tools that do have dedicated wikipedia pages and subreddits, and that I'd never heard of godbolt before, I don't think it's out of line to be skeptical of such a hyperbolic claim.