Rust support is powered by the Rust Language Server (RLS). If you don't have it installed, the extension will install it for you. This extension is built and maintained by the RLS team, part of the Rust IDEs and editors team. It is the reference client implementation for the RLS. Our focus is on providing a stable, high quality extension that makes best use of the RLS. We aim to support as many features as possible, but our priority is supporting the essential features as well as possible.