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I'm trying to get rust-analyzer working in Neovim, but with no luck so far.

I've downloaded the rust-analyzer binary (rust-analyzer-x86_64-pc-windows-msvc.gz) from the rust-analyzer releases page and put it in my PATH (specifically in %USERPROFILE%\.rustup\toolchains\rust-analyzer-x86_64-pc-windows-msvc).

I have the language server enabled in my init.lua but when I open a source file in a rust project and enter :LspInfo I get the following:

 Config: rust_analyzer
    filetypes:         rust
    root directory:    C:\Users\[my user name]\source\repos\rust\loops
    cmd:               rust-analyzer
    cmd is executable: Unable to find executable. Please check your path and ensure the server is installed
    autostart:         true
    custom handlers:   

My init.lua for lsp config looks like this:

local servers = { 'gopls', 'lemminx', 'rust_analyzer' }
for _, lsp in ipairs(servers) do
    nvim_lsp[lsp].setup {
        on_attach = on_attach,
        capabilities = capabilities,
    }
end

gopls is working all fine, so I think that config is correct. But rust-analyzer just doesn't seem to work.

I've also tried installing rust-analyzer in VSCode in case neovim can use that one, but that didn't appear to work either.

I'm using v0.5.0 of neovim.

I read on some webpage that I've now lost that the rust-analyzer MSVC needs to be registered but I can't find any info on how to register an MSVC.

For comparison, this is what :LspInfo shows when I have a Go source file open and the gopls LSP is attached:

 Client: gopls (id: 1, pid: 59572, bufnr: [1])
    filetypes:       go, gomod
    autostart:       true
    root directory:  C:\Users\[my user name]\source\repos\go\k6-extensions\xk6-wsrte
    cmd:             gopls
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  • 1
    Can you run the command rust-analyzer, or is the command rust-analyzer-x86_64-pc-windows-msvc? It's not clear from your description of the paths involved
    – D. Ben Knoble
    Nov 8 '21 at 15:33
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    @D.BenKnoble that's a very good question and I don't know the answer. What's baffling me is that the init.lua says rust_analyzer but the error message says rust-analyzer. I don't know where the cmd value is coming from. Running rust-analyzer or rust_analyzer from command line just gets the "is not recognized as a name of a cmdlet etc" response. Same for trying rust-analyzer-x86_64-pc-windows-msvc. Nov 8 '21 at 16:19
  • Ah, I finally stumbled across what I was doing wrong! I'll self-answer. Nov 8 '21 at 17:09
  • @D.BenKnoble I also discovered that in the nvim-lspconfig folders there's a rust_analyzer.lua file that defines the cmd - which is 'rust-analyzer'. This has been most educational! Nov 8 '21 at 17:34
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I had missed the section of the documentation that says:

Other editors generally require the rust-analyzer binary to be in $PATH. You can download pre-built binaries from the releases page. You will need to uncompress and rename the binary for your platform, e.g. from rust-analyzer-aarch64-apple-darwin.gz on Mac OS to rust-analyzer, make it executable, then move it into a directory in your $PATH.

Once I have renamed the rust-analyzer-x86_64-pc-windows-msvc file to rust-analyzer.exe when I opened a rust source file in nvim I got this from :LspInfo:

 Client: rust_analyzer (id: 1, pid: 57880, bufnr: [1])
    filetypes:       rust
    autostart:       true
    root directory:  C:\Users\[my user name]\source\repos\rust\loops
    cmd:             rust-analyzer

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