Rust is pre-alpha; it's as green as it can be, and it is first and foremost (for the moment) a PL research project. You should not be using it in production, or

Rust is pre-alpha; it's as green as it can be, and it is first and foremost (for the moment) a PL research project. You should not be using it in production, or expecting things to not break between releases. That said, breaking changes are becoming less and less common. The language syntax has been mostly stabilized and most changes are going into corner cases and managing modularity, and much of the possible experimentation has been fenced to the post-1.0 release.