On Wed, Feb 17, 2016 at 1:33 PM, Glenn Morris <rgm@gnu.org> wrote:

It's our old friend, unescaped paren in column 0.
You can write \[, or change open-paren-in-column-0-is-defun-start.

Thanks! That's entirely acceptable. I actually don't know why this was sent today. It must be hanging around on my mail spool for the past year or so which is when I tried to file the bug.