Klaus-Dieter Bauer <bauer.klaus.dieter@gmail.com> schrieb am Sa., 26. Nov.
2016 um 00:13 Uhr:

> Hello!
>
> In `emacs-lisp-mode', the counting of the nesting level of forms seems
> to be broken in some subtle way. Consider e.g.
>
>     (form
>      (
>       ) WEIRD HIGHLIGHT
>         x) ;; Unexepected Indentation
>
> It looks like "WEIRD HIGHLIGHT" is wrongly highlighted as junk after a
> surplus closing parenthesis, and the subsequent form is also weirdly
> indented.
>
>
This is working as intended (i.e. not a bug). Lisp-mode explicitly tests
for this. When you hover over the highlighted part, you get a tooltip
"Hidden behind deeper element; move to another line?"
While not a syntax error, there's such a strong convention to avoid such
formatting that the Lisp modes warn unconditionally about it.