[steveklabnik]

Let's be a bit more precise: the _language_ has few breaking changes right now, but the _libraries_ are absolutely in a lot of flux.

My "Rust for Rubyists" doesn't use a ton of library code, and here's all it took from 0.9 to 0.10: https://github.com/steveklabnik/rust_for_rubyists/commit/9e5...

[BrandonM]

I looked through that, and it seemed that the vast majority of the changes were in prose, tool output, and println. There were some other smallish changes as well, but that doesn't seem so bad for a language that is being very clear that breaking changes are still occurring.

[steveklabnik]

Yup. To be clear, this is a ~50 page introduction to the language, so it's not as though I'm testing all of the features of Rust, but the language itself is not changing a whole lot at this point. And what does is often a find/replace.