Error detected while processing coc.vim -> -complete used without -nargs

[Whitecx]

Describe the bug

My vim version 8.2.3150 give the following warning with coc.vim installed
Error detected while processing .vim/plugged/coc.nvim/plugin/coc.vim: line 484: E1208: -complete used without -nargsPress ENTER or type command to continue

Looking at the repo for coc.vim, the existing codebase matches what I have locally. Specifically, this line is the offender

command! -nargs=0 -complete=custom,coc#list#names CocListCancel   :call coc#rpc#notify('listCancel', [])

Looking at the Vimscript docs, I see that the following attribute is included to allow for autocompletion for arguments:

-complete=custom,{func} custom completion, defined via {func}

However, line 484 of the plugin specifies 0 arguments, which makes the line seem unnecessary and is probably causing the warning. Should -complete-custom be removed?

Reproduce the bug

.vimrc:

  2 set laststatus=2
  3 set noshowmode
  4 set tabstop=4
  5 set hlsearch
  6 set nocompatible              " required
  7 filetype off                  " required
  8 
  9 call plug#begin('~/.vim/plugged')
 10 
 11 Plug 'neoclide/coc.nvim', {'branch': 'release'}
 12 Plug 'preservim/nerdtree'
 13 call plug#end()
 14 
 15 " Enable folding
 16 set foldmethod=indent
 17 set foldlevel=99
 18 " Enable folding with the spacebar
 19 nnoremap <space> za
 20 
 21 let python_highlight_all=1
 22 syntax on

Steps: Open any file w/ vim (v. 8.2.3150)

[Whitecx]

Removing

-complete=custom,coc#list#names 

Got rid of the error and I don't see any bugs as a result so far. If someone confirms that this is the appropriate way to handle this, I could submit a quick PR for it.

[jenhsun]

Just change .vim/plugged/coc.nvim/plugin/coc.vim line 484's -nargs=0 to -nargs=? and keep -complete=custom,coc#list#names solve the problem.

Fix from #3211 (comment)

[chemzqm]

Fixed on latest release branch of coc.nvim.