Error while migrating from rust-tools

[Blonteractor]

Neovim version (nvim -v)

v0.9.5

Operating system/version

MacOS 14.0

Output of :checkhealth rustaceanvim

rustaceanvim: require("rustaceanvim.health").check()

- ERROR Failed to run healthcheck for "rustaceanvim" plugin. Exception:
  function health#check, line 25
  Vim(eval):E5108: Error executing lua ...share/nvim/lazy/rustaceanvim/lua/rustaceanvim/health.lua:134: loop or previous error loading module 'rustaceanvim.config.internal'
  stack traceback:
  [C]: in function 'require'
  ...share/nvim/lazy/rustaceanvim/lua/rustaceanvim/health.lua:134: in function 'check'
  [string "luaeval()"]:1: in main chunk

How to reproduce the issue

cargo new --bin foo
cd foo
nvim src/main.rs

Expected behaviour

The plugin should load normally.

Actual behaviour

Errors out when opening any rust file.

Error detected while processing BufReadPost Autocommands for "*":                                                                                                               
Error executing lua callback: ...brew/Cellar/neovim/0.9.5/share/nvim/runtime/filetype.lua:24: Error executing lua: ...brew/Cellar/neovim/0.9.5/share/nvim/runtime/filetype.lua:2
5: BufReadPost Autocommands for "*"..FileType Autocommands for "rust"..FileType Autocommands for "*"..function <SNR>1_LoadFTPlugin[19]..script /Users/priyanshu/.local/share/nvi
m/lazy/rustaceanvim/ftplugin/rust.lua: Vim(runtime):E5113: Error while calling lua chunk: ...nvim/lazy/rustaceanvim/lua/rustaceanvim/config/check.lua:65: attempt to index local
 'server' (a function value)                                                                                                                                                    
stack traceback:                                                                                                                                                                
        ...nvim/lazy/rustaceanvim/lua/rustaceanvim/config/check.lua:65: in function 'validate'                                                                                  
        ...m/lazy/rustaceanvim/lua/rustaceanvim/config/internal.lua:330: in main chunk                                                                                          
        [C]: in function 'require'                                                                                                                                              
        ...hu/.local/share/nvim/lazy/rustaceanvim/ftplugin/rust.lua:2: in main chunk                                                                                            
        [C]: in function 'nvim_exec_autocmds'                                                                                                                                   
        ...hare/nvim/lazy/lazy.nvim/lua/lazy/core/handler/event.lua:157: in function <...hare/nvim/lazy/lazy.nvim/lua/lazy/core/handler/event.lua:156>                          
        [C]: in function 'xpcall'                                                                                                                                               
        .../.local/share/nvim/lazy/lazy.nvim/lua/lazy/core/util.lua:113: in function 'try'                                                                                      
        ...hare/nvim/lazy/lazy.nvim/lua/lazy/core/handler/event.lua:156: in function 'trigger'                                                                                  
        ...hare/nvim/lazy/lazy.nvim/lua/lazy/core/handler/event.lua:87: in function <...hare/nvim/lazy/lazy.nvim/lua/lazy/core/handler/event.lua:72>                            
        [C]: in function 'nvim_cmd'                                                                                                                                             
        ...brew/Cellar/neovim/0.9.5/share/nvim/runtime/filetype.lua:25: in function <...brew/Cellar/neovim/0.9.5/share/nvim/runtime/filetype.lua:24>                            
        [C]: in function 'nvim_buf_call'                                                                                                                                        
        ...brew/Cellar/neovim/0.9.5/share/nvim/runtime/filetype.lua:24: in function <...brew/Cellar/neovim/0.9.5/share/nvim/runtime/filetype.lua:10>                            
stack traceback:                                                                                                                                                                
        [C]: in function 'nvim_cmd'                                                                                                                                             
        ...brew/Cellar/neovim/0.9.5/share/nvim/runtime/filetype.lua:25: in function <...brew/Cellar/neovim/0.9.5/share/nvim/runtime/filetype.lua:24>                            
        [C]: in function 'nvim_buf_call'                                                                                                                                        
        ...brew/Cellar/neovim/0.9.5/share/nvim/runtime/filetype.lua:24: in function <...brew/Cellar/neovim/0.9.5/share/nvim/runtime/filetype.lua:10>                            
stack traceback:                                                                                                                                                                
        [C]: in function 'nvim_buf_call'                                                                                                                                        
        ...brew/Cellar/neovim/0.9.5/share/nvim/runtime/filetype.lua:24: in function <...brew/Cellar/neovim/0.9.5/share/nvim/runtime/filetype.lua:10>

The minimal config used to reproduce this issue.

I followed LazyVim/LazyVim#2198

{
    "mrcjkb/rustaceanvim",
    version = "^3",
    ft = { "rust" },
    opts = {
      server = function(_, bufnr)
        local wk = require "which-key"
        wk.register({
          ["<leader>ca"] = {
            function()
              vim.cmd.RustLsp "codeAction"
            end,
            "Code Action",
          },
          ["<leader>dr"] = {
            function()
              vim.cmd.RustLsp "debuggables"
            end,
            "Rust debuggables",
          },
        }, { mode = "n", buffer = bufnr })
      end,
      settings = {
        ["rust-analyzer"] = {
          cargo = {
            allFeatures = true,
            loadOutDirsFromCheck = true,
            runBuildScripts = true,
          },
          checkOnSave = {
            allFeatures = true,
            command = "clippy",
            extraArgs = { "--no-deps" },
          },
          procMacro = {
            enable = true,
            ignored = {
              ["async-trait"] = { "async_trait" },
              ["napi-derive"] = { "napi" },
              ["async-recursion"] = { "async_recursion" },
            },
          },
        },
      },
    },
    config = function(_, opts)
      vim.g.rustaceanvim = vim.tbl_deep_extend("force", {}, opts or {})
    end,
  },

[mrcjkb]

Hey 👋

You've got an error in your config:

opts = {
    server = function(_, bufnr)

should be

opts = {
    server = {
        on_attach = function(_, bufnr)

[Blonteractor]

Oh I completely missed that. Thanks for the help!