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

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Package: emacs;

Reported by: "Drew Adams" <drew.adams <at> oracle.com>

Date: Mon, 23 Apr 2012 00:58:01 UTC

Severity: minor

Tags: confirmed

Merged with 24542

Found in versions 24.1.50, 25.1.50, 27.0.50

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

Bug is archived. No further changes may be made.

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Message #27 received at 11314 <at> debbugs.gnu.org (full text, mbox):

From: Drew Adams <drew.adams <at> oracle.com>
To: Andreas Schwab <schwab <at> linux-m68k.org>, Stefan Kangas <stefan <at> marxist.se>
Cc: 11314 <at> debbugs.gnu.org
Subject: RE: bug#11314: 24.1.50; Regression: incorrect Lisp indentation for
 `if' with `@@@@@@'
Date: Fri, 1 Nov 2019 14:23:54 -0700 (PDT)

> >> (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 ,@).

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.
This bug report was last modified 1 year and 38 days ago.

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