Rust Assist 
Simple VSCode diagnostic integration. Provides: code diagnostics, formatting, and snippets.
This extension is for if the RLS is causing you issues. If it is not, I recommend trying out the official Rust VSCode Extension.
Features
Inline Code Diagnostics
This extension automatically provides inline diagnostics for Rust by calling cargo check and parsing the output. As a result, it avoids using the RLS. This isn't ideal in the long term, but currently the nightly RLS preview has trouble on some projects and crashes frequently.
By default, this runs on save and on startup.
Formatting is supported through the rustfmt tool. Formatting style can be configured by creating a rustfmt.toml file in the same directory as your Cargo.toml file. Possible configuration settings can be found here. More information about the rustfmt tool can be found here.
By default, formatting is not enabled.
Supports Multiple Rust Projects
It supports multiple rust projects in the same workspace. The extension will search for Cargo.toml files in the workspace and use them as the root directories to generate diagnostics for.
Snippets
Basic snippets are provided for Rust.
Installation
Requirements
cargo is required on your path.rustfmt is required on your path.
Installing rustfmt
Make sure you have rustup installed. Instructions for installing rustup can be found here.
If you have already installed rustfmt via cargo, you will need to delete it from your cargo bin directory. Using rustfmt through cargo may break when switching toolchains or updating the compiler.
Install rustfmt by running:
rustup component add rustfmt-preview
Extension Settings
This extension contributes the following settings:
| Setting |
Description |
Default |
rust-assist.diagnosticsOnStartup |
Specifies if diagnostics should be generated on startup. |
true |
rust-assist.diagnosticsOnSave |
Specifies if diagnostics should be generated on save. |
true |
rust-assist.formatOnSave |
Specifies if the file should be formatted on save. |
false |
rust-assist.formatMode |
The format mode to write in. Backup generates backups, overwrite does not. |
overwrite |
Known Issues
If a Cargo.toml file is not found, the extension will not provide diagnostic data.
Release Notes
0.2.3 - 2018-11-07
- Display an error when there's an configuration error in
rustfmt.toml.
