How do I solve "Couldn't start client Rust Language Server" with the Rust VS Code extension?

Question

After installing the Rust extension for VS Code, building the project fails with the following error:

Couldn't start client Rust Language Server

Rustup not available. Install from https://www.rustup.rs

This is in spite of the fact that rustup is installed in the system, and accessible from the VS Code terminal.

See also [Couldn't start client Rust Language Server](https://stackoverflow.com/q/58312319/155423) — Shepmaster, Mar 23 '20 at 15:57

score 43 · Accepted Answer · edited Mar 23 '20 at 15:51

43

This is an oft-reported issue in the rls-vscode repository, and I found the solution buried in some of the discussions (1, 2).

The issue seems to be with the path to the rustup executable. rustup works fine on the terminal, but VS Code cannot locate it.

Adding the following to the setting.json of the extension fixes the path for the extension.

"rust-client.rustupPath": "/home/XXX/.cargo/bin/rustup"

edited Mar 23 '20 at 15:51

Shepmaster

answered Mar 23 '20 at 15:46

suj1th

8

If you are developing on remote SSH, make sure to edit your remote settings: Command Palette (Ctrl+Shift+P) -> Open remote settings. Otherwise, the "rustupPath" setting will not be available. – Isaiah Shiner Nov 26 '20 at 14:29
3

`which rustup` gives me `/snap/bin/rustup`. I modified the setting in `settings.json` accordingly, reloaded, but the problem remains. Any suggestions? – Thomas W Jan 20 '21 at 10:54
This solved the problem for me. Thank you – Vandad Nahavandipoor Mar 05 '22 at 10:52

score 3 · Answer 2 · answered Jan 09 '22 at 10:31

3

@suj1th first cited approach fixed it for me.
Add: "rust-client.rustupPath": "$HOME/.cargo/bin/rustup" to your user settings.

answered Jan 09 '22 at 10:31

Justin

score 1 · Answer 3 · answered Feb 02 '22 at 19:56

1

My fix was to launch VSCode from the terminal with code.

answered Feb 02 '22 at 19:56

remjx

score 0 · Answer 4 · answered Feb 27 '21 at 00:06

0

On Windows:

Start > search for "Edit environment variables for account" > Edit "Path" > Add "%USERPROFILE%\.cargo\bin"

answered Feb 27 '21 at 00:06

rofrol

score 0 · Answer 5 · answered Oct 19 '21 at 08:25

0

I got this error when using nightly.
Set it back to stable, then it worked:

cargo default stable

answered Oct 19 '21 at 08:25

Cuong Nguyen

1

Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Oct 19 '21 at 08:27

score 0 · Answer 6 · answered Mar 22 '22 at 18:17

0

I needed to add the Windows path (without $HOME) to get it to work.

"rust-client.rustupPath": "C:/Users/myusername/.cargo/bin/rustup"

answered Mar 22 '22 at 18:17

Daniel Vaughan

6 Answers6