Re: [vim/vim] runtime(sh): Selectively suppress matching syntax errors (PR #20935)

zzzyxwvut left a comment (vim/vim#20935)

The syntax plugins for `sh` (the target plugin of this patch)  
and `csh` (see [`syntax/csh.vim`](https://github.com/vim/vim/blob/master/runtime/syntax/csh.vim)) do not depend on one another;  
there is no common configuration between them.

If filetype detection is enabled (`:filetype plugin on`), you  
may consider `after/ftplugin/sh.vim` (which is sourced before  
`syntax/sh.vim` and `after/syntax/sh.vim`) for tailoring  
`g:sh_no_error_rules` to already known files where certain  
"syntax errors" are misclaimed.  For example,

```vim
if fnamemodify(bufname(), ':t') ==# 'sh_functions_bash.sh'
    " Do not define shDerefWordError.
    let g:sh_no_error_rules = ['shDerefWordError']
else
    " Define and try every sh*Error candidate otherwise.
    unlet! g:sh_no_error_rules g:sh_no_error
endif
```


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