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bug#31727: 25.3; format-spec clobbers match data

From: Richard Stallman
Subject: bug#31727: 25.3; format-spec clobbers match data
Date: Wed, 06 Jun 2018 17:30:45 -0400

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Since 'format' does not clobber the match data,
I think users will expect 'format-spec' to behave likewise.

So I think we should fix it to preserve the match data,
one way or another.

That is the choice that makes Emacs simpler to program for.

Dr Richard Stallman
President, Free Software Foundation (https://gnu.org, https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)

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