Eli Zaretskii <eliz@gnu.org> writes:

> Is this in the MSYS Bash?  I meant inside Emacs.

I tried all of the following:

1)  Started Msys bash by clicking on mingw64.exe

2)  Made a test.bat containing
    msys2_shell.cmd -mingw64 -mintty

3)  At Windows cmd, typed
    bash -c 'MSYSTEM=MINGW64 exec /usr/bin/bash --login -i'

How do you start Msys?

> I have none of these.  Windows runtime ignores these variables, but
> maybe MSYS2 Hunspell doesn't.  What happens if you set LC_ALL=C and
> try your recipe again?

I set that in .bash_profile with the combinations mentioned above, but
no avail.  I'm out of ideas, but since it works for you, the problem
must be at my end.  For now, I will downgrade Hunspell and keeping
searching.  Many thanks again for looking at this.

While we're at it, if found a small typo in the doc-string of
`ispell-buffer-with-debug', patch is attached.

Best, Arash