Re: [PATCH 1/2] Add new variable to force new-style backquote interpretation.

[Stefan Monnier]

>> > As discussed in
>> > http://lists.gnu.org/archive/html/emacs-devel/2017-10/msg00051.html, we
>> > (mostly) agreed to first turn them into errors

Still looks like a complete waste of time to me.  I still haven't seen
a single example of code which works in Emacs-25 (say) and fails in
a byzantine manner if we silently drop support for old-style backquotes.

OTOH we have already seen at least one example of code which works
correctly in Emacs-25, works correctly if we drop support for old-style
backquotes, and yet fails with this "in-between" support.

So not only it's extra work for very little benefit (i.e. try and
protect us from a hypothetical case no-one has ever seen in the wild)
but it even costs us a known bug.

Sorry, but the tradeoff really doesn't look good from here.


        Stefan