Error detected while processing function rustfmt#Format[7]..<SNR>44_RunRustfmt:

[reubenwong97]

Hello,

I am getting the following error when using :RustFmt.

Error detected while processing function rustfmt#Format[7]..<SNR>44_RunRustfmt:
line   48:
E776: No location list

It just prints out my source code while not performing any formatting. Any assistance is greatly appreciated.

For added info, my init.lua looks like this, I am using Astronvim:

--              AstroNvim Configuration Table
-- All configuration changes should go inside of the table below
-- You can think of a Lua "table" as a dictionary like data structure the
-- normal format is "key = value". These also handle array like data structures
-- where a value with no key simply has an implicit numeric key
local config = {

  -- Configure AstroNvim updates
  updater = {
    remote = "origin", -- remote to use
    channel = "nightly", -- "stable" or "nightly"
    version = "latest", -- "latest", tag name, or regex search like "v1.*" to only do updates before v2 (STABLE ONLY)
    branch = "main", -- branch name (NIGHTLY ONLY)
    commit = nil, -- commit hash (NIGHTLY ONLY)
    pin_plugins = nil, -- nil, true, false (nil will pin plugins on stable only)
    skip_prompts = false, -- skip prompts about breaking changes
    show_changelog = true, -- show the changelog after performing an update
    auto_reload = false, -- automatically reload and sync packer after a successful update
    auto_quit = false, -- automatically quit the current session after a successful update
    -- remotes = { -- easily add new remotes to track
    --   ["remote_name"] = "https://remote_url.come/repo.git", -- full remote url
    --   ["remote2"] = "github_user/repo", -- GitHub user/repo shortcut,
    --   ["remote3"] = "github_user", -- GitHub user assume AstroNvim fork
    -- },
  },

  -- set vim options here (vim.<first_key>.<second_key> =  value)
  options = {
    opt = {
      relativenumber = true, -- sets vim.opt.relativenumber
    },
    g = {
      mapleader = ",", -- sets vim.g.mapleader
      rustfmt_command = "$HOME/.rustup/toolchains/stable-aarch64-apple-darwin/bin/rustfmt", -- sets vim.g.rustfmt_command
    },
  },
  -- If you need more control, you can use the function()...end notation
  -- options = function(local_vim)
  --   local_vim.opt.relativenumber = true
  --   local_vim.g.mapleader = " "
  --   local_vim.opt.whichwrap = vim.opt.whichwrap - { 'b', 's' } -- removing option from list
  --   local_vim.opt.shortmess = vim.opt.shortmess + { I = true } -- add to option list
  --
  --   return local_vim
  -- end,

    -- enable or disable highlighting for extra plugins
    plugins = {
      aerial = true,
      beacon = false,
      bufferline = true,
      dashboard = true,
      highlighturl = true,
      hop = false,
      indent_blankline = true,
      lightspeed = false,
      ["neo-tree"] = true,
      notify = true,
      ["nvim-tree"] = false,
      ["nvim-web-devicons"] = true,
      rainbow = true,
      symbols_outline = false,
      telescope = true,
      vimwiki = false,
      ["which-key"] = true,
    },
  },

  -- Diagnostics configuration (for vim.diagnostics.config({...}))
  diagnostics = {
    virtual_text = true,
    underline = true,
  },

  -- Extend LSP configuration
  lsp = {
    skip_setup = { "rust_analyzer" },
    -- enable servers that you already have installed without mason
    servers = {
      -- "pyright"
    },
    -- easily add or disable built in mappings added during LSP attaching
    mappings = {
      n = {
        -- ["<leader>lf"] = false -- disable formatting keymap
      },
    },
    -- add to the global LSP on_attach function
    -- on_attach = function(client, bufnr)
    -- end,

    -- override the mason server-registration function
    -- server_registration = function(server, opts)
    --   require("lspconfig")[server].setup(opts)
    -- end,

    -- Add overrides for LSP server settings, the keys are the name of the server
    ["server-settings"] = {
      -- example for addings schemas to yamlls
      -- yamlls = { -- override table for require("lspconfig").yamlls.setup({...})
      --   settings = {
      --     yaml = {
      --       schemas = {
      --         ["http://json.schemastore.org/github-workflow"] = ".github/workflows/*.{yml,yaml}",
      --         ["http://json.schemastore.org/github-action"] = ".github/action.{yml,yaml}",
      --         ["http://json.schemastore.org/ansible-stable-2.9"] = "roles/tasks/*.{yml,yaml}",
      --       },
      --     },
      --   },
      -- },
      -- Example disabling formatting for a specific language server
      -- gopls = { -- override table for require("lspconfig").gopls.setup({...})
      --   on_attach = function(client, bufnr)
      --     client.resolved_capabilities.document_formatting = false
      --   end
      -- }
    },
  },

  -- Mapping data with "desc" stored directly by vim.keymap.set().
  --
  -- Please use this mappings table to set keyboard mapping since this is the
  -- lower level configuration and more robust one. (which-key will
  -- automatically pick-up stored data by this setting.)
  mappings = {
    -- first key is the mode
    n = {
      -- second key is the lefthand side of the map
      -- mappings seen under group name "Buffer"
      ["<leader>bb"] = { "<cmd>tabnew<cr>", desc = "New tab" },
      ["<leader>bc"] = { "<cmd>BufferLinePickClose<cr>", desc = "Pick to close" },
      ["<leader>bj"] = { "<cmd>BufferLinePick<cr>", desc = "Pick to jump" },
      ["<leader>bt"] = { "<cmd>BufferLineSortByTabs<cr>", desc = "Sort by tabs" },
      -- quick save
      -- ["<C-s>"] = { ":w!<cr>", desc = "Save File" },  -- change description but the same command
      [";"] = { ":", desc = "Convenience for command mode" },
      ["<C-space>"] = { "<cmd>RustHoverActions<cr>", desc = "To get floating box" },
    },
    t = {
      -- setting a mapping to false will disable it
      -- ["<esc>"] = false,
    },
  },

  -- Configure plugins
  plugins = {
    init = {
      -- You can disable default plugins as follows:
      -- ["goolord/alpha-nvim"] = { disable = true },

      -- You can also add new plugins here as well:
      -- Add plugins, the packer syntax without the "use"
      -- { "andweeb/presence.nvim" },
      -- {
      --   "ray-x/lsp_signature.nvim",
      --   event = "BufRead",
      --   config = function()
      --     require("lsp_signature").setup()
      --   end,
      -- },

      -- We also support a key value style plugin definition similar to NvChad:
      -- ["ray-x/lsp_signature.nvim"] = {
      --   event = "BufRead",
      --   config = function()
      --     require("lsp_signature").setup()
      --   end,
      -- },
      -- Catppuccin theme
      { "catppuccin/nvim" },
      -- Rust support
      {
        "simrat39/rust-tools.nvim",
        after = { "mason-lspconfig.nvim" },
        -- Is configured via the server_registration_override installed below!
        config = function()
          require("rust-tools").setup {
            server = astronvim.lsp.server_settings "rust_analyzer",
            tools = {
              inlay_hints = {
                parameter_hints_prefix = "?  ",
                other_hints_prefix = "?  ",
              },
            },
          }
        end,
      },
    },
    -- All other entries override the require("<key>").setup({...}) call for default plugins
    ["null-ls"] = function(config) -- overrides `require("null-ls").setup(config)`
      -- config variable is the default configuration table for the setup functino call
      local null_ls = require "null-ls"
      -- Check supported formatters and linters
      -- https://github.com/jose-elias-alvarez/null-ls.nvim/tree/main/lua/null-ls/builtins/formatting
      -- https://github.com/jose-elias-alvarez/null-ls.nvim/tree/main/lua/null-ls/builtins/diagnostics
      config.sources = {
        -- Set a formatter
        null_ls.builtins.formatting.stylua,
        null_ls.builtins.formatting.prettier,
      }
      -- set up null-ls's on_attach function
      -- NOTE: You can remove this on attach function to disable format on save
      config.on_attach = function(client)
        if client.resolved_capabilities.document_formatting then
          vim.api.nvim_create_autocmd("BufWritePre", {
            desc = "Auto format before save",
            pattern = "<buffer>",
            callback = vim.lsp.buf.formatting_sync,
          })
        end
      end
      return config -- return final config table to use in require("null-ls").setup(config)
    end,
    treesitter = { -- overrides `require("treesitter").setup(...)`
      ensure_installed = { "lua" },
    },
    -- use mason-lspconfig to configure LSP installations
    ["mason-lspconfig"] = { -- overrides `require("mason-lspconfig").setup(...)`
      ensure_installed = { "sumneko_lua", "rust_analyzer" },
    },
    -- use mason-tool-installer to configure DAP/Formatters/Linter installation
    ["mason-tool-installer"] = { -- overrides `require("mason-tool-installer").setup(...)`
      ensure_installed = { "prettier", "stylua" },
    },
    packer = { -- overrides `require("packer").setup(...)`
      compile_path = vim.fn.stdpath "data" .. "/packer_compiled.lua",
    },
  },

  -- LuaSnip Options
  luasnip = {
    -- Add paths for including more VS Code style snippets in luasnip
    vscode_snippet_paths = {},
    -- Extend filetypes
    filetype_extend = {
      javascript = { "javascriptreact" },
    },
  },

  -- CMP Source Priorities
  -- modify here the priorities of default cmp sources
  -- higher value == higher priority
  -- The value can also be set to a boolean for disabling default sources:
  -- false == disabled
  -- true == 1000
  cmp = {
    source_priority = {
      nvim_lsp = 1000,
      luasnip = 750,
      buffer = 500,
      path = 250,
    },
  },

  -- Modify which-key registration (Use this with mappings table in the above.)
  ["which-key"] = {
    -- Add bindings which show up as group name
    register_mappings = {
      -- first key is the mode, n == normal mode
      n = {
        -- second key is the prefix, <leader> prefixes
        ["<leader>"] = {
          -- third key is the key to bring up next level and its displayed
          -- group name in which-key top level menu
          ["b"] = { name = "Buffer" },
        },
      },
    },
  },

  -- This function is run last and is a good place to configuring
  -- augroups/autocommands and custom filetypes also this just pure lua so
  -- anything that doesn't fit in the normal config locations above can go here
  polish = function()
    -- Set key binding
    -- Set autocommands
    vim.api.nvim_create_augroup("packer_conf", { clear = true })
    vim.api.nvim_create_autocmd("BufWritePost", {
      desc = "Sync packer after modifying plugins.lua",
      group = "packer_conf",
      pattern = "plugins.lua",
      command = "source <afile> | PackerSync",
    })

    -- Set up custom filetypes
    -- vim.filetype.add {
    --   extension = {
    --     foo = "fooscript",
    --   },
    --   filename = {
    --     ["Foofile"] = "fooscript",
    --   },
    --   pattern = {
    --     ["~/%.config/foo/.*"] = "fooscript",
    --   },
    -- }
  end,
}

return config

[simrat39]

RustFmt is not provided by this plugin, but by https://github.com/rust-lang/rust.vim. To run the lsp style of formatting, see :lua vim.lsp.buf.formatting() (this will also write to the buffer).

[winkee01]

@simrat39 I didn't install rust-lang/rust.vim, why does the command :RustFmt available but not executable?

[rodrigc]

There is an example of using lsp to format the buffer, so you don't need to call RustFmt. See: https://sharksforarms.dev/posts/neovim-rust/#whats-next

vim.api.nvim_create_autocmd("BufWritePre", {
  pattern = "*.rs",
  callback = function()
   vim.lsp.buf.formatting_sync(nil, 200)
  end,
  group = format_sync_grp,
})

[ethanmsl]

+1 to what @winkee01 said -- I've not downloaded rust.vim (it looks semi-abandoned). rust-tools.nvim is the only rust-specific neovim plugin that I have, but I also have both RustFmt and RustFmtRange as command options.

Both of which complain along the lines of:

Error detected while processing function rustfmt#Format[7]..<SNR>65_RunRustfmt:
line   48:
E776: No location list

Doing a quick search of this repo I found the following:

I'm not full conversant in how this plugin works (thank you for it btw!) -- but perhaps some unintended code slipped in?

---

(There's also specifically (above) mention that The rustfmt option is unstable and only available on a nightly build. Sounds like a comment for different/unintended code, but I'll just add that I'm using stable neovim (v0.8.1).)

[Clish254]

Did you find a solution to this @reubenwong97? i'm getting the same error trying to get format on save to work.

[reubenwong97]

RustFmt is not provided by this plugin, but by https://github.com/rust-lang/rust.vim. To run the lsp style of formatting, see :lua vim.lsp.buf.formatting() (this will also write to the buffer).

Hey @Clish254 ,

I am no longer actively using nvim for rust development. But at the time, i followed the solution laid out by @simrat39 and all I had to do was install the rust-lang/rust.vim plugin and formatting on save worked. Hope this works for you.

[Clish254]

RustFmt is not provided by this plugin, but by https://github.com/rust-lang/rust.vim. To run the lsp style of formatting, see :lua vim.lsp.buf.formatting() (this will also write to the buffer).

Hey @Clish254 ,

I am no longer actively using nvim for rust development. But at the time, i followed the solution laid out by @simrat39 and all I had to do was install the rust-lang/rust.vim plugin and formatting on save worked. Hope this works for you.

That worked, thanks!