I've been able to reproduce this on MacOS 10.14 Mojave running Emacs 26.2
and Emacs 27 (forget exact version, installed it yesterday using "brew
install emacs --HEAD").

I've also reproduced it on Windows in Cygwin running Emacs 26.2. On an
Ubuntu server I use running Emacs 24.5.1 I cannot reproduce the issue.

"emacs -Q" should ignore all init files and packages correct? Is there
anything else on my system that could be affecting this?

Note that for the same file contents this issue does not occur if I name
the file test.py, so I believe it's related to c++-mode.

Best,
Jayden


On Sat, Jun 22, 2019 at 7:52 AM Juanma Barranquero <lekktu@gmail.com> wrote:

> On Sat, Jun 22, 2019 at 4:26 PM Jayden Navarro <jayden@yugabyte.com>
> wrote:
>
> > 7. You should hit: Args out of range: #<buffer test.cc>, 0, 1
>
> I cannot reproduce it with 26.2.90 on Windows.
>