Rust language support for Atom-IDE

atom, atom-ide, ide, rls, rust
apm install ide-rust@0.19.2



Rust language support for Atom-IDE, powered by the Rust Language Server (RLS).


  • Auto-completion
  • Diagnostics (errors and warnings from rustc and clippy, see clippy_preference setting)
  • Document outline
  • Go to definition (ctrl or cmd click)
  • Type information and Documentation on hover (hold ctrl or cmd for more information)
  • Find references (ctrl-alt-shift-f or cmd-opt-shift-f also in context menu)
  • Format file with rustfmt (ctrl-shift-c or cmd-shift-c also in context menu)
  • Format on save (disabled by default, see atom-ide-ui settings)
  • Rls toolchain selection in package settings
  • Rls toolchain update checking at startup & every 6 hours thereafter
  • Global Rls configuration for all_targets, clippy_preference
  • Per-project Rls configuration using rls.toml file at project root, see rls#configuration
    # rls.toml
    features = ["serde"]
  • Graceful handling of Rls being missing from the distribution (which is/was somewhat common on the nightly channel)
    • Warns before installing a rust version without Rls or when using an already installed one
    • Automatic detection of, and prompt to install, the latest working dated release
  • Rust language snippets


You can install from the command line with:

$ apm install ide-rust

Or you can install from Settings view by searching for ide-rust.

No other packages or manual setup is required as these will be handled with user prompts after install. However, you may wish to install rustup with your OS package manager instead of following prompts to install via


  • ide-rust:restart-all-language-servers Restart all currently active Rls processes

Multi-crate projects

A root Cargo.toml is required in each atom project, however cargo workspaces can be used to support multiple crates in a single project. For example, a project with 'rust_foo' & 'rust_bar' directories/crates could have the following root Cargo.toml

# Cargo.toml
members = [

Even if you only have a single crate in your Atom project, RLS can only detect it if you have a root Cargo.toml. If your project is setup such that you have one or more crate nested in folders under the root, you can add a root Cargo.toml file and setup a Cargo workspace that includes all the crates in the project:

# Cargo.toml
members = [

Overriding Rls

The Rls command can be specified manually, for example to run from local source code:

# config.cson
    rlsCommandOverride: "cargo +nightly run --manifest-path=/rls-src/Cargo.toml"

When set you'll be able to see, and remove, this from the package settings. After restarting atom an info message will inform you the override is in place.

Debugging IDE-Rust

If stuff isn't working you can try enabling logging to debug:

  • Open the atom console (ctrl-shift-i)
  • Enter atom.config.set('core.debugLSP', true)
  • Reload atom (ctrl-shift-F5)

This will spit out language server message logging into the atom console. Check if requests/responses are being sent or are incorrect. It will also include any Rls stderr messages (as warnings) which may point to Rls bugs.


MIT License. See the license for more details.