Rust

.rs files work like JavaScript: a local analysis with tree-sitter as soon as a file opens, then rust-analyzer when it is installed.

Without a server

• Syntax errors.
• File structure (Ctrl+F12): functions, structs and their fields, enums and their variants, traits, impl blocks, modules, constants, macros.
• Occurrences of the name under the caret, and Ctrl+click to the declaration in the file (local variables, parameters, items).
• Completion of the names of the file, the prelude, keywords and templates (fn, test, tmod, impl, match, println…).

With rust-analyzer

• Completion of members after . and ::, tooltips with types and documentation.
• Compiler errors and cargo check on save.
• Navigation in the whole project and its dependencies: declaration, type, implementations, usages.
• Rename (Shift+F6) and quick actions (Alt+Enter).
• Reformat code with rustfmt.

Atelier uses the rust-analyzer of rustup (rustup component add rust-analyzer, also from Search Everywhere: Rust: Install Language Server) or the one on the PATH. A project whose root has no Cargo.toml gets the crates of its subfolders declared to the server.

Running

Shift+F10 runs cargo run from the root of the Cargo project, and the run widget offers cargo run, test, build and clippy as run configurations.