rustanalyzer

Rust Analyzer is a language server for the Rust programming language. Implemented as a standalone project, it provides IDE-like features to editors via the Language Server Protocol (LSP). It is one of the most widely used Rust language servers and is commonly compared with the Rust Language Server (RLS).

Development and design: The project emphasizes speed and accuracy by performing semantic analysis and incremental computation over the codebase. It maintains a local database of analysis results and reuses previous work as the code changes. The architecture relies on the Salsa incremental framework and integrates with Cargo to understand workspace structure and dependencies, striving to deliver precise diagnostics and fast navigation in large projects.

Key features include code completion with contextual suggestions; go to definition, find references, and hover-based type information; inline documentation; on-the-fly diagnostics and code actions; refactoring support; inlay hints for types and parameter names; macro expansion and related diagnostics. It aims to provide robust support for multi-crate workspaces and integrates with Rust tooling.

Editors and integrations: The most common deployment is via the VS Code extension named rust-analyzer, but the server is editor-agnostic and usable with any editor that supports the Language Server Protocol. Plugins exist for Vim/Neovim, Emacs, Sublime Text, and IntelliJ Rust.

Licensing and status: Rust Analyzer is open source and released under a dual MIT/Apache license. Its source code and releases are hosted on GitHub, with an active development community and frequent updates adding features and improving performance.