Two of the three “Cons” for Rust are quickly becoming inaccurate since this post was written. A formal Rust language specification is being put together as part of the Ferrocene project, which is being tackled by a team that is committed to making Rust usable for high reliability applications. As for multiple compiler implementations, there are currently two different implementations in progress. The first is a GCC-based compiler. The second is a C++ compiler that compiles a subset of the language that can compile the reference compiler. This will allow for easier porting to new platforms.