From: "Davis Herring" <herring@lanl.gov>
To: "Glenn Morris" <rgm@gnu.org>
Cc: Geoff Gole <geoffgole@gmail.com>, emacs-devel@gnu.org
Subject: Re: (require 'cus-load) clobbers match-data
Date: Tue, 16 Feb 2010 12:25:36 -0800 (PST) [thread overview]
Message-ID: <37521.130.55.118.19.1266351936.squirrel@webmail.lanl.gov> (raw)
In-Reply-To: <swy6itndl7.fsf@fencepost.gnu.org>
> In general, there should be no expectation that any operation in Emacs
> will preserve the match-data (unless it explicitly says so).
>
>> Maybe require should save and restore the match data itself?
>
> This would be completely unnecessary in the vast majority of cases.
> Since a require can run arbitrary code, there should be no expectation
> that it preserves match-data.
This may not have been the original point, but loading a library can be
the result of calling an autoloaded function, even one that advertises
that it preserves the match data. In that case it makes sense for `load'
(or something else in that sequence) to save it; loading a file is
(typically) already expensive compared to `save-match-data'.
Davis
--
This product is sold by volume, not by mass. If it appears too dense or
too sparse, it is because mass-energy conversion has occurred during
shipping.
next prev parent reply other threads:[~2010-02-16 20:25 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-14 5:13 (require 'cus-load) clobbers match-data Geoff Gole
2010-02-14 7:01 ` David Kastrup
2010-02-14 7:49 ` Geoff Gole
2010-02-14 8:00 ` David Kastrup
2010-02-14 8:33 ` Geoff Gole
2010-02-16 20:13 ` Glenn Morris
2010-02-16 20:25 ` Davis Herring [this message]
2010-02-16 21:11 ` Andreas Schwab
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