bug#34975: 26.1.92; In backquote, the comma marker does not work with variable name started with dot

[Basil L. Contovounesios]

Noam Postavsky <npostavs@gmail.com> writes:

> Eli Zaretskii <eliz@gnu.org> writes:
>
>>> From: Noam Postavsky <npostavs@gmail.com>
>>> Date: Wed, 03 Apr 2019 23:31:24 -0400
>>> Cc: Xu Chunyang <mail@xuchunyang.me>, 34975@debbugs.gnu.org
>>> 
>>> There's also Bug#19790 about this.  I think it makes sense to just
>>> remove this reader macro, as far as I can tell, nobody really wants this
>>> destructive splicing feature.
>>
>> How hard would it be fixing it?  I'm uneasy with removing features
>> because we are confused about them.
>
> The destructive splicing feature was never added though.  Only the
> reader macro part.  But if you're asking about possible breakage, then
> yes, it's possible that someone out there wrote a macro which gives some
> semantics to ",.", like pcase gives its own semantics to "`" and ",".

I, for one, have several times found myself using nconc+list where I
would rather use backquote, precisely because the latter is never
destructive.

Not a must-have by any measure, but definitely a nice-to-have,
especially given the reader macro already exists.

-- 
Basil