Handling errors

[dlukes]

It would be great to include some pointers on how to handle errors in a clean way. When a Rust function returns Result<T, E>, what's a good way of communicating that across the FFI boundary?

[dlukes]

I asked how this could be done on Reddit and I was pointed to the getsentry/symbolic repository as a source of inspiration. I summarized their approach in this comment (hopefully I didn't get it too wrong).

I like the way they do it, it seems clean and natural, but then again it's the first approach I've seen (prior to this, I had no idea at all how to do error handling across the FFI boundary), so it's not like I have a very refined taste in this respect :)