feat(rust_analyzer): do not use lspconfig.util

And some minor warning fixes

Author: TheRealLorenz

lsp/rust_analyzer.lua

@@ -21,13 +21,11 @@
 --- Note: do not set `init_options` for this LS config, it will be automatically populated by the contents of settings["rust-analyzer"] per
 --- https://github.com/rust-lang/rust-analyzer/blob/eb5da56d839ae0a9e9f50774fa3eb78eb0964550/docs/dev/lsp-extensions.md?plain=1#L26.
 
-local util = require 'lspconfig.util'
-
 local function reload_workspace(bufnr)
   local clients = vim.lsp.get_clients { bufnr = bufnr, name = 'rust_analyzer' }
   for _, client in ipairs(clients) do
     vim.notify 'Reloading Cargo Workspace'
-    client.request('rust-analyzer/reloadWorkspace', nil, function(err)
+    client:request('rust-analyzer/reloadWorkspace', nil, function(err)
       if err then
         error(tostring(err))
       end
@@ -64,14 +62,11 @@ return {
       return
     end
 
-    local cargo_crate_dir = util.root_pattern 'Cargo.toml'(fname)
+    local cargo_crate_dir = vim.fs.root(bufnr, 'Cargo.toml')
     local cargo_workspace_root
 
     if cargo_crate_dir == nil then
-      on_dir(
-        util.root_pattern 'rust-project.json'(fname)
-          or vim.fs.dirname(vim.fs.find('.git', { path = fname, upward = true })[1])
-      )
+      on_dir(vim.fs.root(bufnr, { 'rust-project.json', '.git' }))
       return
     end