Rust runtime should show rustc versions

[Jess3Jane]

As can be seen on many pages (example) the current behavior when talking about the rust runtime is to show the version of cargo but this is nearly useless. A much better approach would be to list the version of rustc the server supports as this actually informs what language features you have available.

The version of rustc used should also be updated from whatever version it's currently running as a fair few things have changed since early 2018. Ideally this should track rustc stable (currently 1.38) as this is what most people will expect.

[Xyene]

Thanks for reporting!

I've fixed this in #536, and it'll be reflected on the site after it is merged. I've also updated the Rust version on dmoj.ca to 1.38.

Ideally this should track rustc stable (currently 1.38) as this is what most people will expect.

While we try to keep runtimes recently up-to-date, always tracking the latest version of > 50 fast-moving languages requires manpower we unfortunately don't have.