pandoc-3.10: test/command/9555.md

```
% pandoc -t native -f latex
a\@ b\@c

\makeatletter
a\@ b\@c
\makeatother
a\@ b\@c
^D
[ Para [ Str "a" , Space , Str "bc" ]
, Para [ Str "ab" , SoftBreak , Str "a" , Space , Str "bc" ]
]
```