GNU bug report logs - #10940
Emacs 24: regression reading comma

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Chris Leyon <cleyon <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Emacs 24: regression reading comma
Date: Sun, 4 Mar 2012 12:11:28 -0500

In Emacs 23, the lisp reader correctly parses a comma when reading an
event modifier, as in the following example specifying the character
C-,
    (global-set-key [(control ,)] 'my-command)

The Emacs 24 reader gives the following error when parsing the same expression:
    Invalid read syntax: )

Message #8 received at 10940 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Chris Leyon <cleyon <at> gmail.com>
Cc: 10940 <at> debbugs.gnu.org
Subject: Re: bug#10940: Emacs 24: regression reading comma
Date: Sun, 04 Mar 2012 21:47:36 -0500

> In Emacs 23, the lisp reader correctly parses a comma when reading an
> event modifier, as in the following example specifying the character
> C-,
>     (global-set-key [(control ,)] 'my-command)

You did not realize, but the above relies on the old-style backquote
syntax, which has been further phased out (it's been obsolete for a very
long time now).  So now (control ,) fails in the same way as (control
').  Use [(control ?,)] or [(control \,)] instead (which will work for
older emacsen as well).


        Stefan

Message #11 received at 10940 <at> debbugs.gnu.org (full text, mbox):

From: Chong Yidong <cyd <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 10940 <at> debbugs.gnu.org, Chris Leyon <cleyon <at> gmail.com>
Subject: Re: bug#10940: Emacs 24: regression reading comma
Date: Mon, 05 Mar 2012 11:13:53 +0800

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

>> In Emacs 23, the lisp reader correctly parses a comma when reading an
>> event modifier, as in the following example specifying the character
>> C-,
>>     (global-set-key [(control ,)] 'my-command)
>
> You did not realize, but the above relies on the old-style backquote
> syntax, which has been further phased out (it's been obsolete for a very
> long time now).  So now (control ,) fails in the same way as (control
> ').  Use [(control ?,)] or [(control \,)] instead (which will work for
> older emacsen as well).

I've added a note to etc/NEWS about this.

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