bug-gnu-emacs
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

bug#34975: 26.1.92; In backquote, the comma marker does not work with va


From: Michael Heerdegen
Subject: bug#34975: 26.1.92; In backquote, the comma marker does not work with variable name started with dot
Date: Wed, 27 Mar 2019 02:50:14 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Andreas Schwab <address@hidden> writes:

> On Mär 26 2019, Michael Heerdegen <address@hidden> wrote:
>
> > But if you destructively modify the result of the backquote expression,
> > you may also change Y destructively (but not X).  Things like these
> > might be clear if you come from Common Lisp, but it's all not obvious
> > IMHO.
>
> You need always be careful when destructively modifying structures,
> independent of how they were computed.

What I wanted to say was that it can be surprising that splicing may
reuse conses at all (it had been to me).  The manual only tells that the
elements of the spliced list "become elements of the result".  I had to
learn it the hard way.  I had been careful, but I just didn't expect a
problem in that situation.

Michael.





reply via email to

[Prev in Thread] Current Thread [Next in Thread]