If you want to check out Rust and are having trouble because the docs aren't close to done yet, Rust for Rubyists (rustforrubyists.com) just came out with an update supporting 0.11. If you're using the nightlies, the only thing in that book that isn't consistent (that I've found so far) is that the .to_str() method is now .to_string().
0.11 was the first edition I _completely_ re-read all the text and fixed things, and I still had something like ~10 errors. Editing your own writing is hard.
