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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: modern regexes in emacs
Date: Tue, 26 Feb 2019 17:29:43 +0200
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To: Lars Ingebrigtsen <larsi@gnus.org>
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In-reply-to: <m3mumienam.fsf@gnus.org> (message from Lars Ingebrigtsen on Tue, 
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> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Tue, 26 Feb 2019 13:39:45 +0100
> Cc: emacs-devel@gnu.org
> 
> We don't need a read syntax for all new objects.  For instance, we have
> no read syntax for
> 
> (window-frame) -> #<frame emacs 0x562a456cefb0>

That's true, but don't forget that some features that record history
of various kinds do expect to be able to read back regexps.  E.g.,
desktop.el.