Re: [Emacs-diffs] trunk r116779: Restore compatibility with legacy comment-start-skip values

[Dmitry Gutov]

On 17.03.2014 17:50, Stefan wrote:
> > +                      ;; Some older modes use regexps that check the
> > +                      ;; char before the comment for quoting.  (Bug#16971)

In light of your latest message on #16971, I'll probably have to change 
this comment.

> > +                      (save-excursion
> > +                        (forward-char -1)
> > +                        (looking-at comment-start-skip)))
>
> This needs to additionally check that (match-end 1) points to what we
> thought was the comment start.

Can you think of a situation when that's not true?

And suppose it doesn't, then what?