Error while opening a file: E5108: Error executing lua vim.lua:63: .../.config/nvim/pack/minpac/start/lsp_signature.nvim/lua/lsp_signature.lua:225: '=' expected near 'continue'

[jian-lin]

I use minpac to install this plugin call minpac#add('ray-x/lsp_signature.nvim'). And I put this in my init.vim:

lua << EOF
require'lsp_signature'.on_attach()
EOF

Every time I open a file, this error appears:

E5108: Error executing lua vim.lua:63: .../.config/nvim/pack/minpac/start/lsp_signature.nvim/lua/lsp_signature.lua:225: '=' expected near 'continue'

The error line is goto continue. After I comment out that line, a similar error appears:

E5108: Error executing lua vim.lua:63: .../.config/nvim/pack/minpac/start/lsp_signature.nvim/lua/lsp_signature.lua:232: '=' expected near 'continue'

This error line is goto continue, too. After I comment out that line, another error appears:

E5108: Error executing lua vim.lua:63: .../.config/nvim/pack/minpac/start/lsp_signature.nvim/lua/lsp_signature.lua:260: unexpected symbol near ':'

This error line is ::continue::. After I comment out that line, no error appears.

I use the prebuilt neovim on github and its version is:

NVIM v0.5.0-dev+1398-gd09b8ad71
Build type: RelWithDebInfo
LuaJIT 2.1.0-beta3

[ray-x]

Unable to reproduce
Here is minium vimrc with minipack. Sample is given with python pyright

if &compatible
  " `:set nocp` has many side effects. Therefore this should be done
  " only when 'compatible' is set.
  set nocompatible
endif
function! PackInit() abort
packadd minpac

call minpac#init()

" minpac must have {'type': 'opt'} so that it can be loaded with `packadd`.
call minpac#add('k-takata/minpac', {'type': 'opt'})

" Add other plugins here.
call minpac#add('vim-jp/syntax-vim-ex')
call minpac#add('neovim/nvim-lspconfig')

call minpac#add('ray-x/aurora')
call minpac#add('ray-x/lsp_signature.nvim')
endfunction

" Load the plugins right now. (optional)
"packloadall



lua <<EOF

require'lspconfig'.pyright.setup {}
require'lsp_signature'.on_attach()
EOF


command! PackUpdate call PackInit() | call minpac#update()
command! PackClean  call PackInit() | call minpac#clean()
command! PackStatus packadd minpac | call minpac#status()

My neovim version: Jun 11 67eb63df506ed0e3

[jian-lin]

Thanks for your help.
I find the cause is that I compile neovim against lua-5.1. Since goto is introduced in lua-5.2, this error appears.
I said my neovim is prebuilt on github because I thought it may be convenient for you to debug and I did reproduce it on the prebuilt version. Now I think I have made some mistakes when reproducing this on the prebuilt version.

[ray-x]

It is strange
I do not think it is the case.
As I also use LuaJIT 2.1.0-beta3

NVIM v0.5.0-dev+1385-g93f15db5d-dirty                                                                                                                                                 
Build type: Release                                                                                                                                                                   
LuaJIT 2.1.0-beta3                                                                                                                                                                    

goto is available in Lua-JIT. (check this : https://luajit.org/extensions.html)

[jian-lin]

Yes, goto is available in luajit and lua-5.2. However, on Gentoo, neovim is compiled against lua-5.1, which doesn't support goto, by default.
I have this issue when compiling neovim against lua-5.1. After I compile neovim against luajit, I don't have this issue. Maybe I didn't express myself clearly in the last message.

[ray-x]

I think you need to file an issue in neovim for platform gentoo.
Lots of neovim plugins built on LuaJIT. And programmer is presuming the LuaJIT is available by default.