Recently I've been trying to learn Vim 9 script by rewriting Vim plugins
into Vim 9 script. While attempting to modify *vim-unimpaired*, I
discovered that functions related to setting up mappings do not work
properly when ported to Vim 9 script. For example, in the
`plugin/unimpaired.vim` file, the function `MapNextFamilty` is problematic.
**Original version:**
```vim
execute 'nnoremap <silent> '.prefix.'previous) :<C-U>exe
"'.cmd.'previous'.end
execute 'nnoremap <silent> '.prefix.'next) :<C-U>exe "'.cmd.'next'.end
execute 'nnoremap '.prefix.'first) :<C-U><C-R>=v:count ? v:count . "' .
a:current . '" : "' . a:cmd . 'first"<CR><CR>' . zv
execute 'nnoremap '.prefix.'last) :<C-U><C-R>=v:count ? v:count . "' .
a:current . '" : "' . a:cmd . 'last"<CR><CR>' . zv
execute 'nnoremap <silent> '.map.'Previous :<C-U>exe "'.cmd.'previous'.end
execute 'nnoremap <silent> '.map.'Next :<C-U>exe "'.cmd.'next'.end
execute 'nnoremap <silent> '.map.'First :<C-U>exe "'.cmd.'first'.end
execute 'nnoremap <silent> '.map.'Last a:<C-U>exe "'.cmd.'last'.end
```
**Vim 9 script version:**
```vim
execute 'nnoremap <silent> ' .. prefix .. 'previous) :<C-U>exe "' .. tcmd
.. 'previous' .. end
execute 'nnoremap <silent> ' .. prefix .. 'next) :<C-U>exe "' .. tcmd
.. 'next' .. end
execute 'nnoremap ' .. prefix .. 'first) :<C-U><C-R>=v:count ? v:count .
"' .. current .. '" : "' .. cmd .. 'first"<CR><CR>' .. zv
execute 'nnoremap ' .. prefix .. 'last) :<C-U><C-R>=v:count ? v:count .
"' .. current .. '" : "' .. cmd .. 'last"<CR><CR>' .. zv
execute 'nnoremap <silent> ' .. tmap .. 'Previous :<C-U>exe "' .. tcmd ..
'previous' .. end
execute 'nnoremap <silent> ' .. tmap .. 'Next :<C-U>exe "' .. tcmd ..
'next' .. end
execute 'nnoremap <silent> ' .. tmap .. 'First :<C-U>exe "' .. tcmd ..
'first' .. end
execute 'nnoremap <silent> ' .. tmap .. 'Last :<C-U>exe "' .. tcmd ..
'last' .. end
```
When inspecting the mappings using:
```vim
echo maparg('<Plug>('unimpaired-commmand')', 'n')
```
you find that both versions produce identical mappings. For example:
- **Original version:**
```
:<C-U>exe "".(v.count ? v:count : "")."bprevious"<CR>
```
- **Vim 9 script version:**
```
:<C-U>exe "".(v.count ? v:count : "")."bprevious"<CR>
```
Despite the mappings appearing the same, the one defined in the Vim 9
script version does not work. Even after removing `<silent>`, no error
messages are reported. Any advice?
**Test Environment:**
- **OS:** Fedora Linux 42 (x86-64)
- **Vim:** 9.1.1418
My repository is https://github.com/seanexplus/vim-unimpaired/tree/master .
All vim 9 script rewriting is in vim-9-test branch.
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