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bug#62366: 30.0.50; Doc: add-to-list: destructive?
From: |
Michael Heerdegen |
Subject: |
bug#62366: 30.0.50; Doc: add-to-list: destructive? |
Date: |
Wed, 22 Mar 2023 04:19:38 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) |
Hello,
An example to demonstrate what I want to suggest: I use the following
piece of code in my personal customization of Calc:
#+begin_src emacs-lisp
(when (eq calc-language 'latex)
(add-to-list 'math-expr-opers (list "\\cdot" '* 191 190))))
#+end_src
It is important that this code does not modify the list in
`math-expr-opers' destructively because this list shares a sublist that
is the value of a different variable I must avoid to change by side
effect.
AFAIK `add-to-list' is safe in that regard unless you specify the APPEND
argument (where it suggests itself that the operation is destructive).
So, can we add this simple detail to the docstring of `add-to-list':
that this function doesn't modify the list that the LIST-VAR is bound to
unless APPEND is non-nil? It would be strange if this would not be the
case, still, I think it would be good to speak this out.
TIA,
Michael.
In GNU Emacs 30.0.50 (build 27, x86_64-pc-linux-gnu, cairo version
1.16.0) of 2023-03-20 built on drachen
Repository revision: aa54a24570e526b5438264caacf405a2370ba9d3
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux 11 (bullseye)
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Michael Heerdegen <=