return {
	server = {
		on_attach = require("solo.mason.handlers").on_attach,
		capabilities = require("solo.mason.handlers").capabilities,
	},
	tools = {
		-- how to execute terminal commands
		-- options right now: termopen / quickfix
		executor = require("rust-tools.executors").termopen,
		-- callback to execute once rust-analyzer is done initializing the workspace
		-- The callback receives one parameter indicating the `health` of the server: "ok" | "warning" | "error"
		on_initialized = function()
			vim.api.nvim_create_autocmd({ "BufEnter", "CursorHold", "InsertLeave", "BufWritePost" }, {
				group = vim.api.nvim_create_augroup("InitializeRustAnalyzer", { clear = true }),
				pattern = { "*.rs" },
				callback = function()
					vim.lsp.codelens.refresh()
				end,
			})
		end,
		-- automatically call RustReloadWorkspace when writing to a Cargo.toml file.
		reload_workspace_from_cargo_toml = true,
		-- These apply to the default RustSetInlayHints command
		inlay_hints = {
			-- automatically set inlay hints (type hints)
			-- default: true
			auto = true,
			-- Only show inlay hints for the current line
			only_current_line = false,
			-- whether to show parameter hints with the inlay hints or not
			-- default: true
			show_parameter_hints = true,
			-- prefix for parameter hints
			-- default: "<-"
			parameter_hints_prefix = " <- ",
			-- prefix for all the other hints (type, chaining)
			-- default: "=>"
			other_hints_prefix = " => ",
			-- whether to align to the length of the longest line in the file
			max_len_align = false,
			-- padding from the left if max_len_align is true
			max_len_align_padding = 1,
			-- whether to align to the extreme right or not
			right_align = false,
			-- padding from the right if right_align is true
			right_align_padding = 7,
			-- The color of the hints
			highlight = "Comment",
		},
		-- options same as lsp hover / vim.lsp.util.open_floating_preview()
		hover_actions = {
			-- the border that is used for the hover window
			-- see vim.api.nvim_open_win()
			border = {
				{ "╭", "FloatBorder" },
				{ "─", "FloatBorder" },
				{ "╮", "FloatBorder" },
				{ "│", "FloatBorder" },
				{ "╯", "FloatBorder" },
				{ "─", "FloatBorder" },
				{ "╰", "FloatBorder" },
				{ "│", "FloatBorder" },
			},
			-- Maximal width of the hover window. Nil means no max.
			max_width = nil,
			-- Maximal height of the hover window. Nil means no max.
			max_height = nil,
			-- whether the hover action window gets automatically focused
			-- default: false
			auto_focus = false,
		},
		-- settings for showing the crate graph based on graphviz and the dot
		-- command
		crate_graph = {
			-- Backend used for displaying the graph
			-- see: https://graphviz.org/docs/outputs/
			-- default: x11
			backend = "x11",
			-- where to store the output, nil for no output stored (relative
			-- path from pwd)
			-- default: nil
			output = nil,
			-- true for all crates.io and external crates, false only the local
			-- crates
			-- default: true
			full = true,
		},
		-- all the opts to send to nvim-lspconfig
		-- these override the defaults set by rust-tools.nvim
		-- see https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md#rust_analyzer
		server = {
			-- standalone file support
			-- setting it to false may improve startup time
			standalone = true,
		}, -- rust-analyzer options
		-- debugging stuff
		dap = {
			adapter = {
				type = "executable",
				command = "codelldb",
				name = "rt_lldb",
			},
		},
	},
}