inline-c-rs

Go is the language with very fast compile times; Rust's aren't particularly good, and, depending on the exact details, maybe slower than C++'s. It's pretty variable. We've been working on it but it's non-trivial. There are tons of tools in Rust to preprocess headers, and do even more fun things like https://github.com/Hywan/inline-c-rs (which is obviously not a general solution to this problem but is interesting)