Need help to make rust-analyzer work

[Hidan0]

I'm trying to setup my development environment for an ESP32, but I'm having issues with rust-analyzer. I've installed the toolchain with espup install and sourced the envs.

When my lsp starts it crashed with this error:

error: 'rust-analyzer' is not installed for the toolchain 'esp'
note: this is a custom toolchain, which cannot use `rustup component add`
help: if you built this toolchain from source, and used `rustup toolchain link`, then you may be able to build the component with `x.py`

I'm using Neovim and it works fine with the stable toolchain.

These are the RA settings:

settings = {
      ["rust-analyzer"] = {
        checkOnSave = true,
        check = {
          command = "clippy",
        },
      },
    },

Any idea on how to fix/work around this problem?

[SergioGasquez]

Hi! I can't really help since I do not use Neovim, but I don't have any issues with RA in VS Code. espup install the artifacts that rust-build generates after building rust.

Here are a few similar issues that might be useful to you:

• rust-analyzer errors in VSCode with blank project esp-template#58
• Rust-analyzer errors when opening a project generated with the cargo template esp-idf-template#74

[Hidan0]

With some help I found a solution: forcing nvim to use RA from Mason (a plugin to manage LSP servers).

I think it was using RA from the stable toolchain before and that was causing the crash. After removing RA component there still was a link to rustup (/usr/bin/rust-analyzer -> /usr/bin/rustup) --I don't know why--. Deleting the link "forced" nvim to use RA from Mason, and "fixed" the problem.