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Re: [perl #130497] Revert "Unescaped left brace in regex" fatality

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Leon Timmermans
April 6, 2017 00:42
Re: [perl #130497] Revert "Unescaped left brace in regex" fatality
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On Wed, Feb 8, 2017 at 6:18 PM, Karl Williamson via RT
<> wrote:
> It occurs to me another argument in favor of keeping it fatal is, as I've said before, I think it is safer when making a change that can cause working programs to have a different behavior, to have that syntax to be fatal for a release or two.  That's why I originally was going to have /xx be fatal for 5.26.  But the fact that it was fatal during essentially the entirety of the 5.25 series without a single BBC report convinced me it was ok to go ahead and change the meaning.
> I think that by making this portion of the unescaped '{' fatal in 5.26, we will lessen the chances that the final portion will create problems in future releases.

It seems that right now we're breaking autoconf by making this fatal.
*Autoconf*. It has been fixed in their repository, but they haven't
done a stable release in years. Think of that what you want, but
there's a staggering amount of software depending on autoconf.

I don't see how we can not revert this fatalization given these
circumstances. The advantages are too theoretical to offset this very
practical problem, and reverting would give us at least a year to deal
with autotools' release inertia.


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