From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Pierpaolo Bernardi <olopierpa@gmail.com>
Cc: dalanicolai <dalanicolai@gmail.com>, Emacs Devel <emacs-devel@gnu.org>
Subject: Re: Weird let behavior (and where to ask for support)
Date: Sat, 22 Jan 2022 23:27:30 -0500 [thread overview]
Message-ID: <jwv8rv7cc3m.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <b37qmvo9b215lpuxvr3r4vm0.1642906267657@email.android.com> (Pierpaolo Bernardi's message of "Sun, 23 Jan 2022 03:51:07 +0100")
> You are modifying the constant '(0). Modifying constants has an unspecified
> effect, one manifestation of which you are observing.
> Change '(0) to (list 0).
Exactly. IOW never use `nreverse`, `sort`¸ `nconc`, etc... on a list
unless you know for sure all the `conses` in that list are all freshly
made and not shared with anything else.
'(0)
does not return a freshly made list, but instead return the same old
and tired list created when the code was loaded into Emacs.
Stefan
next prev parent reply other threads:[~2022-01-23 4:27 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-23 2:51 Weird let behavior (and where to ask for support) Pierpaolo Bernardi
2022-01-23 4:27 ` Stefan Monnier [this message]
2022-01-23 10:26 ` dalanicolai
-- strict thread matches above, loose matches on Subject: below --
2022-01-23 0:33 dalanicolai
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