attempt to call local 'fn' (a table value)

[sahinakkaya]

FAQ

• I have checked the FAQ and it didn't resolve my problem.

Announcement

• I have checked Breaking change announcement.

Minimal reproducible full config

if has('vim_starting')
  set encoding=utf-8
endif
scriptencoding utf-8

if &compatible
  set nocompatible
endif

let s:plug_dir = expand('/tmp/plugged/vim-plug')
if !filereadable(s:plug_dir .. '/plug.vim')
  execute printf('!curl -fLo %s/autoload/plug.vim --create-dirs https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim', s:plug_dir)
end

execute 'set runtimepath+=' . s:plug_dir
call plug#begin(s:plug_dir)
Plug 'hrsh7th/nvim-cmp'
Plug 'hrsh7th/cmp-buffer'
Plug 'hrsh7th/cmp-nvim-lsp'
Plug 'hrsh7th/vim-vsnip'
Plug 'neovim/nvim-lspconfig'
call plug#end()
PlugInstall | quit

" Setup global configuration. More on configuration below.
lua << EOF
local cmp = require "cmp"
cmp.setup {
  snippet = {
    expand = function(args)
      vim.fn["vsnip#anonymous"](args.body)
    end,
  },

  mapping = {
    ["<Tab>"] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_next_item()
      else
        fallback()
      end
    end, { "i", "s", "c" }),
    ['<CR>'] = cmp.mapping.confirm({ select = true })
  },
    sorting = {
      priority_weight = 2,
      comparators = {
        cmp.config.compare.exact,
        cmp.config.compare.locality,
        cmp.config.compare.recently_used,
        cmp.config.compare.score,
        cmp.config.compare.sources,
        cmp.config.compare.offset
      },
    },
  sources = cmp.config.sources({
    { name = "nvim_lsp" },
    { name = "buffer" },
  }),
}
EOF

lua << EOF
local capabilities = require('cmp_nvim_lsp').default_capabilities()

require'lspconfig'.cssls.setup {
  capabilities = capabilities,
}
EOF

Description

When I open nvim with some comparators defined in nvim-cmp, they are giving me error in the title.

Steps to reproduce

Open nvim with nvim -u cmp-repro.vim cmp-repro.vim and just insert any character. You will see an error in the bottom.

Expected behavior

I should be able to use all comparators.

Actual behavior

I get an error any time completion list is updated.

Additional context

❯ nvim --version
NVIM v0.10.0
Build type: Debug
LuaJIT 2.1.1713484068
Run "nvim -V1 -v" for more info

[croyleje]

I have the same problem was able to fix by rolling back the latest neovim update.

[sahinakkaya]

You mean I should rollback to nvim 0.9.5? When your car has a flat tire, you replace the tire not the car.

[erynofwales]

Several of the items in the compare module are tables with __call metamethods rather than simple functions. The recently_used comparator is one of those.

Commenting that one out in my comparators list fixed the problem for me.

[sahinakkaya]

Commenting that one out in my comparators list fixed the problem for me.

Yeah, of course. Just another "workaround". I don't want to downgrade neovim, I don't want to "hide" the problem by commenting it out. I want it to be fixed. That's why I opened this. In fact, I already know the problem is related with comparators:

When I open nvim with some comparators defined in nvim-cmp, they are giving me error in the title.

Instead of suggesting workarounds please upvote the issue so that it can get some attention from developers.

[Shougo]

OK. I have reproduced.

[Shougo]

It seems misc.merge() is broken.

misc.merge = function(tbl1, tbl2)
  local is_dict1 = type(tbl1) == 'table' and (not islist(tbl1) or vim.tbl_isempty(tbl1))
  local is_dict2 = type(tbl2) == 'table' and (not islist(tbl2) or vim.tbl_isempty(tbl2))
  if is_dict1 and is_dict2 then
    local new_tbl = {}
    for k, v in pairs(tbl2) do
      if tbl1[k] ~= misc.none then
        new_tbl[k] = misc.merge(tbl1[k], v)
      end
    end
    for k, v in pairs(tbl1) do
      if tbl2[k] == nil then
        if v ~= misc.none then
          new_tbl[k] = misc.merge(v, {})
        else
          new_tbl[k] = nil
        end
      end
    end
    return new_tbl
  end

  if tbl1 == misc.none then
    return nil
  elseif tbl1 == nil then
    return misc.merge(tbl2, {})
  else
    return tbl1
  end
end

misc.merge brokes metatable. __call is removed. So it will be error.

[Shougo]

I have fixed it in #1956. Please test.