I hope that when Rust hits 1.0 -- they take backward compatibility exceptionally seriously. The pre-1.0 path has been exceptional wild ride, and it has made me a bit gun shy about the language as a whole.

I am no stranger to pre-1.0 languages, I have worked with lots of them, but none have been as frustrating (or interesting) as Rust... the question as to will Rust grow into a production language or an academic toy still remains an open one in my book.

Reserving judgement until 1.0 is out.