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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: convert-standard-filename on w32 does not preserve match-data?
Date: Thu, 21 Dec 2006 13:07:04 -0500
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Xref: news.gmane.org gmane.emacs.devel:64058
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    No, I think instead that code that calls convert-standard-filename shouldn't
    expect it to preserve the match-data.

It seems cleaner to me for a general subroutine, that does a job not
specifically related to searching or matching, to preserve the match
data, rather than making all its callers take care.