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

[Andreas Schwab]

On Nov 01 2019, Stefan Kangas wrote:

> found 11314 27.0.50
> thanks
>
> "Drew Adams" <drew.adams@oracle.com> 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.

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Andreas Schwab, schwab@linux-m68k.org
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