Setting up Rust LSP

[NeotenicPrimate]

I have followed the instructions layed out here Languages, here rust-analyzer Language Server Binary and here How to install the default language servers.

I have placed the binary for the language server in $PATH as indicated by:

hx --health rust

Configured language server: rust-analyzer
Binary for language server: /Users/MyName/.cargo/bin/rust-analyzer
Configured debug adapter: lldb-vscode
Binary for debug adapter: Not found in $PATH
Highlight queries: ✓
Textobject queries: ✓
Indent queries: ✓

My languages.toml looks like this:

[[language]]
name = "rust"

[language.config]
checkOnSave = { command = "clippy" }

[[grammar]]
name = "rust"
source = { git = "https://github.com/tree-sitter/tree-sitter-rust", rev = "0431a2c60828731f27491ee9fdefe25e250ce9c9" }

Currently when I Space-k Helix returns Language server not active for current buff.

My goal is to get the following to work

• Inline compile time errors
• Type hints
• Auto-complete suggestions

[CptPotato]

How did you create your rust project? Did you use cargo new ...?
You need a project root (like Cargo.toml) for the LSP to work.

If that's the case and it still doesn't work you can check/provide the log file for more information (you can use hx --help to see where the log is located).

[NeotenicPrimate]

Yes I tried both opening an existing project as well as creating a new one (cargo new ...).
Upon inspecting the logs, as you suggested, it seems that the binary is not reachable.

11 2022-11-07T20:14:19.929 helix_view::editor [ERROR] Failed to initialize the LSP for 'source.rust' { cannot find binary path }

(There are many other errors, but I am guessing they all stem from the same problem)

I put the exec binary in $PATH, specifically /Users/MyName/.cargo/bin.

[NeotenicPrimate]

Rather than trying to do it manually, all you need to do is run:

sudo ln -s $(rustup which rust-analyzer ) /usr/local/bin/rust-analyzer

As indicated here.

[nuke-web3]

Strangely for me: I got health of:

rust                   ✓ rust-analyzer        ✓ lldb-vscode          ✓                      ✓                      ✓

but also the same Space-k Helix returns Language server not active for current buff. error, my resolution was a dumb one, I didn't have RA actually installed for my toolchain, just needed:

rustup component add rust-analyzer

[CGMossa]

I still don't know how to get the two things in the path on Windows.

[kirawi]

https://stackoverflow.com/questions/1618280/where-can-i-set-path-to-make-exe-on-windows

[cowboyliao]

My C and python can use lsp greatly, but rust lsp is broken.
I set languages.toml the same as NeotenicPrimate's,and have Binary for language server: /usr/local/bin/rust-analyzer, but still can't work with lsp,this is the error:

helix_lsp::transport [ERROR] err <- "[ERROR rust_analyzer::lsp_utils] rust-analyzer failed to load workspace: Failed to find sysroot for Cargo.toml file /home/username/tools/helix/Cargo.toml. Is rust-src installed?: can't load standard library from sysroot\n"
helix_lsp::transport [ERROR] err <- "/usr\n"
helix_lsp::transport [ERROR] err <- "(discovered via `rustc --print sysroot`)\n"
helix_lsp::transport [ERROR] err <- "try installing the Rust source the same way you installed rustc\n"

rustc --print sysroot shows: /usr/
why rust-analyzer failed to load workspace?
I am newbie to rust, is Cargo.toml matter with this problem.

[cowboyliao]

I saw the same issue in rust-analyzer, I tried rm rust by pacman -R rust, and it work well to me. it should be caused by the packagemanager.

[dmgolembiowski]

For anyone encountering this problem in 2025, this fixed my lsp integration:

rustup self update
rustup self upgrade-data
rustup component rust-analyzer