I dug out a small Rust project from 2016 and with edition = 2018 I got it running again in under 30 minutes, I was kinda surprised. 8 years is ancient in terms of Rust. I have had more problems with certain other crates. But yeah, C/C++ usually don't really compare. 5 years is nothing, it should just work. For Go the big breaking moment was modules. All my pre - 2016?ish code would need some work.

Rust is kinda like c++ here, it's easy until you have a library that has external, non-vendored dependencies.