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bug#3863: 23.1.50; possible save-match-data in copyright.el

From: Stefan Monnier
Subject: bug#3863: 23.1.50; possible save-match-data in copyright.el
Date: Thu, 16 Jul 2009 23:23:29 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.94 (gnu/linux)

> I don't think I understand, but it sounds like this is a reason why
> y-or-n-p should save match-data...

Here we go again:

All functions destroy the match-data except for a few rare exceptions,
which are simple functions doing little work.

> Is there any reason not to let y-or-n-p save match data?

If you think y-or-n-p deserves saving the match-data then pretty much
all other functions deserve that change as well.  And since
save-match-data is somewhat costly, it would imply a singificant
performance impact.


PS: Worse yet: during y-or-n-p, the buffer might be completely changed
by the code run asynchronously, so the "saved" match data may not even
have any meaning any more.

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