There used to be gcc front end during Rust pre-1.0, but it seems that the language was too unstable for it to keep up. A gcc front-end would be great, if only

There used to be gcc front end during Rust pre-1.0, but it seems that the language was too unstable for it to keep up. A gcc front-end would be great, if only to show that the language spec is mature and complete enough that other implementations can be built on it.