Paul Eggert wrote:
> Thanks for reporting that.  It's a bug in one of the optimizations I
> recently added to work around the libpcre slownesses with UTF-8.
> It's also a bug in our test cases, which should have caught the bug.
> I fixed it with the attached patch.

Thanks for fixing that.

BTW, validation_boundary isn't initialized before pre-searching for an
empty line clearly.  As it's set to 0 (NULL pointer in many machine)
implicitly, it isn't a bug.  However, if you don't avoid to initialize it
by intent, could you consider an attached patch?