Hey! This is a post by matklad [1], one of the members of the Ferrous Systems [2] team. The Rust Analyzer project [3] is an experimental compiler front-end, designed to power things like code completion, syntax error reporting, and other things that are necessary when building IDE support. Let us know if you have any questions!
[1]: https://github.com/matklad
[2]: https://ferrous-systems.com
[3]: https://github.com/rust-analyzer/rust-analyzer