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From: Eli Zaretskii <eliz@gnu.org>
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Subject: bug#18577: Regexp I-search: [(error Stack overflow in regexp matcher)]
Date: Sat, 23 Oct 2021 10:32:56 +0300
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To: Stefan Kangas <stefan@marxist.se>
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 (message from Stefan Kangas on Fri, 22 Oct 2021 19:47:53 -0700)
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> From: Stefan Kangas <stefan@marxist.se>
> Date: Fri, 22 Oct 2021 19:47:53 -0700
> Cc: Alan Mackenzie <acm@muc.de>, Andreas Schwab <schwab@linux-m68k.org>,
>  18577@debbugs.gnu.org
> 
> Should we do anything about this, like document it in etc/PROBLEMS, or
> should this bug just be closed?

If we can give useful advice in PROBLEMS, adding that can never hurt.