Oh yea, I wasn't picking on Rust. If anything I tend to defend Rust haha.

As far as what we did to cache, nothing fancy - using Docker build layers. I add my Cargo files (lock/toml), include a stub source lib.rs or main.rs to make it build with a fake source, and then build the project.

This builds all the dependencies. It also builds a fake binary/lib for your project, so you need to strip that from the target directory. Something like `rm -rf target/your?project?name*` (I use ? to wildcard _ and -)

If you do that in one layer, your dependencies will be cached with that docker image. In the next layer you can add your source like normal, compile it, and you'll be set.

We lose our cache frequently though because we're not taking special care to centralize or persist the layer cache. We should, for sanity.