Infinite redirect

[sftse]

docs.rs accepts https://docs.rs/crate/rayon/1.11.0 and https://docs.rs/rayon/1.11.0/rayon/
It redirects links like https://docs.rs/rayon/^1.11.0 but has infinite redirect on https://docs.rs/crate/rayon/^1.11.0 which is the link inserted into https://docs.rs/crate/rayon/1.11.0/features

Related: #2989

Probably could be caught with a test that builds crates and checks the links are accessible.

[syphar]

Yep, a next regression from #2966 (not unexpected).

Will have a look.

Probably could be caught with a test that builds crates and checks the links are accessible.

We're already doing that in many places, seems like there is a gap. I'm happy to review any PRs making it better.