GNU bug report logs - #19734
25.0.50; nested backquotes: recent changes not backward compatible

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Package: emacs;

Reported by: michael_heerdegen <at> web.de

Date: Fri, 30 Jan 2015 17:51:02 UTC

Severity: normal

Found in version 25.0.50

Done: Stefan Monnier <monnier <at> iro.umontreal.ca>

Bug is archived. No further changes may be made.

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Message #10 received at 19734-done <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: 19734-done <at> debbugs.gnu.org
Subject: Re: bug#19734: 25.0.50;
 nested backquotes: recent changes not backward compatible
Date: Fri, 30 Jan 2015 16:01:55 -0500

>     * lisp/emacs-lisp/backquote.el (backquote-process): Optimize away
>       the ,' case.
> were not backwards compatible.  If this was intended (?), it should be
> mentioned in the news I think.

As the commit message indicates, this was supposed to be an
optimization, i.e. no change in observable behavior.

> In trunk, the backquote expression evals to something different now, and
>     ,,'(my-make-feh-cmd)
> from above must now be
>       ,(my-make-feh-cmd)

Yes, your rewrite is correct and desirable, but indeed we had a bug
which I've just fixed in master.  Thanks.


        Stefan
This bug report was last modified 10 years and 117 days ago.

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