GNU bug report logs - #11314
24.1.50; Regression: incorrect Lisp indentation for `if' with `@@@@@@'

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Package: emacs; Severity: minor; Reported by: "Drew Adams" <drew.adams@HIDDEN>; Keywords: confirmed; merged with #24542; dated Mon, 23 Apr 2012 00:58:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Forcibly Merged 11314 24542. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Date: Fri, 1 Nov 2019 14:23:54 -0700 (PDT)
From: Drew Adams <drew.adams@HIDDEN>
To: Andreas Schwab <schwab@HIDDEN>, Stefan Kangas <stefan@HIDDEN>
Subject: RE: bug#11314: 24.1.50; Regression: incorrect Lisp indentation for
 `if' with `@@@@@@'
References: <F902CC50724B4E67AADA2F92594A2F4D@HIDDEN>
 <87imo3xt9o.fsf@HIDDEN> <8736f72unz.fsf@HIDDEN>
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> >> (if (alpha beta)
> >>     @@@@@@
> >>     bbbbbb
> >>
> >> Yet @@@@@@ is a perfectly good symbol/variable name etc.
> >> This regression was introduced in Emacs 22.
> >
> > I can reproduce this on current master.
>=20
> That's because @ has the prefix syntax flag (for ,@).

That explains the implementation bug, I guess.

But there's no backquote or comma here.
And `@@@@@@' is just a normal symbol.

Just as we don't treat comma the same inside
and outside backquote (we raise an error for
the latter), ideally we shouldn't treat @ the
same inside and outside backquote (symbol
syntax for the latter).

And presumably the only uses of @ inside
backquote that should lead to different
indentation would only be when @ follows
comma.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#11314; Package emacs. Full text available.

Message received at 11314 <at> debbugs.gnu.org:


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From: Andreas Schwab <schwab@HIDDEN>
To: Stefan Kangas <stefan@HIDDEN>
Subject: Re: bug#11314: 24.1.50;
 Regression: incorrect Lisp indentation for `if' with `@@@@@@'
References: <F902CC50724B4E67AADA2F92594A2F4D@HIDDEN>
 <87imo3xt9o.fsf@HIDDEN>
X-Yow: Please come home with me...  I have Tylenol!!
Date: Fri, 01 Nov 2019 21:44:48 +0100
In-Reply-To: <87imo3xt9o.fsf@HIDDEN> (Stefan Kangas's message of "Fri, 01
 Nov 2019 20:59:15 +0100")
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On Nov 01 2019, Stefan Kangas wrote:

> found 11314 27.0.50
> thanks
>
> "Drew Adams" <drew.adams@HIDDEN> writes:
>
>> emacs -Q
>>  
>> Type this into an Emacs Lisp buffer:
>>  
>> (if (alpha beta) C-j aaaaaa C-j bbbbbb
>>  
>> You get this:
>>  
>> (if (alpha beta)
>>     aaaaaa
>>   bbbbbb
>>  
>> That is correct.  bbbbbb is indented correctly.
>>  
>> Now do the same thing, using @@@@@@ instead of aaaaaa.  This is the
>> result - bbbbbb is indented incorrectly.
>>  
>> (if (alpha beta)
>>     @@@@@@
>>     bbbbbb
>>  
>> Yet @@@@@@ is a perfectly good symbol/variable name etc.
>>  
>> This regression was introduced in Emacs 22.
>
> I can reproduce this on current master.

That's because @ has the prefix syntax flag (for ,@).

Andreas.

-- 
Andreas Schwab, schwab@HIDDEN
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#11314; Package emacs. Full text available.
bug Marked as found in versions 27.0.50. Request was from Stefan Kangas <stefan@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 11314 <at> debbugs.gnu.org:


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From: Stefan Kangas <stefan@HIDDEN>
To: "Drew Adams" <drew.adams@HIDDEN>
Subject: Re: 24.1.50; Regression: incorrect Lisp indentation for `if' with
 `@@@@@@'
In-Reply-To: <F902CC50724B4E67AADA2F92594A2F4D@HIDDEN> (Drew Adams's
 message of "Sun, 22 Apr 2012 17:56:10 -0700")
References: <F902CC50724B4E67AADA2F92594A2F4D@HIDDEN>
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found 11314 27.0.50
thanks

"Drew Adams" <drew.adams@HIDDEN> writes:

> emacs -Q
>  
> Type this into an Emacs Lisp buffer:
>  
> (if (alpha beta) C-j aaaaaa C-j bbbbbb
>  
> You get this:
>  
> (if (alpha beta)
>     aaaaaa
>   bbbbbb
>  
> That is correct.  bbbbbb is indented correctly.
>  
> Now do the same thing, using @@@@@@ instead of aaaaaa.  This is the
> result - bbbbbb is indented incorrectly.
>  
> (if (alpha beta)
>     @@@@@@
>     bbbbbb
>  
> Yet @@@@@@ is a perfectly good symbol/variable name etc.
>  
> This regression was introduced in Emacs 22.

I can reproduce this on current master.

Best regards,
Stefan Kangas
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#11314; Package emacs. Full text available.
Added tag(s) confirmed. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 11314 <at> debbugs.gnu.org:


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Subject: RE: bug#11314: 24.1.50;
	Regression: incorrect Lisp indentation for `if' with `@@@@@@'
Date: Sun, 16 Sep 2012 17:02:51 -0700
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ping
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#11314; Package emacs. Full text available.

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From: "Drew Adams" <drew.adams@HIDDEN>
To: "'Stefan Monnier'" <monnier@HIDDEN>
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	<jwvbomindzj.fsf-monnier+emacs@HIDDEN>
Subject: RE: bug#11314: 24.1.50;
	Regression: incorrect Lisp indentation for `if' with `@@@@@@'
Date: Mon, 23 Apr 2012 18:21:22 -0700
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 > > Yet @@@@@@ is a perfectly good symbol/variable name etc.
> 
> FWIW, this is probably due to @ being special in the case of ,@,

That was my guess too.

> so if we fix this, we should be careful not to reintroduce
> errors

Yes.  Except I hope you really mean "when", not "if".

> such as C-h v trying to use "@foo" rather than "foo" when
> we're on ",@foo".

Yes.

The fact that this is a regression might offer some hope (if you are the
optimistic sort): at one time it worked.

And `C-h v @foo' also works correctly in Emacs prior to Emacs 22.  And `C-h v'
picks up `@foo' as the default value no matter where the cursor is on the chars
of `@foo'.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#11314; Package emacs. Full text available.

Message received at 11314 <at> debbugs.gnu.org:


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From: Stefan Monnier <monnier@HIDDEN>
To: "Drew Adams" <drew.adams@HIDDEN>
Subject: Re: bug#11314: 24.1.50;
	Regression: incorrect Lisp indentation for `if' with `@@@@@@'
Message-ID: <jwvbomindzj.fsf-monnier+emacs@HIDDEN>
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Date: Mon, 23 Apr 2012 20:58:58 -0400
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> Yet @@@@@@ is a perfectly good symbol/variable name etc.

FWIW, this is probably due to @ being special in the case of ,@, so if
we fix this, we should be careful not to reintroduce errors such as C-h v
trying to use "@foo" rather than "foo" when we're on ",@foo".


        Stefan
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#11314; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: "Drew Adams" <drew.adams@HIDDEN>
To: <bug-gnu-emacs@HIDDEN>
Subject: 24.1.50; Regression: incorrect Lisp indentation for `if' with `@@@@@@'
Date: Sun, 22 Apr 2012 17:56:10 -0700
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emacs -Q
 
Type this into an Emacs Lisp buffer:
 
(if (alpha beta) C-j aaaaaa C-j bbbbbb
 
You get this:
 
(if (alpha beta)
    aaaaaa
  bbbbbb
 
That is correct.  bbbbbb is indented correctly.
 
Now do the same thing, using @@@@@@ instead of aaaaaa.  This is the
result - bbbbbb is indented incorrectly.
 
(if (alpha beta)
    @@@@@@
    bbbbbb
 
Yet @@@@@@ is a perfectly good symbol/variable name etc.
 
This regression was introduced in Emacs 22.
 

In GNU Emacs 24.1.50.1 (i386-mingw-nt5.1.2600)
 of 2012-04-19 on MARVIN
Bzr revision: 107968 monnier@HIDDEN
Windowing system distributor `Microsoft Corp.', version 5.1.2600
Configured using:
 `configure --with-gcc (4.6) --no-opt --enable-checking --cflags
 -ID:/devel/emacs/libs/libXpm-3.5.8/include
 -ID:/devel/emacs/libs/libXpm-3.5.8/src
 -ID:/devel/emacs/libs/libpng-dev_1.4.3-1/include
 -ID:/devel/emacs/libs/zlib-dev_1.2.5-2/include
 -ID:/devel/emacs/libs/giflib-4.1.4-1/include
 -ID:/devel/emacs/libs/jpeg-6b-4/include
 -ID:/devel/emacs/libs/tiff-3.8.2-1/include
 -ID:/devel/emacs/libs/gnutls-3.0.9/include
 -ID:/devel/emacs/libs/libiconv-1.13.1-1-dev/include
 -ID:/devel/emacs/libs/libxml2-2.7.8/include/libxml2'
Acknowledgement sent to "Drew Adams" <drew.adams@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#11314; Package emacs. Full text available.
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