GNU bug report logs - #78930
30.1; (elisp) `Mapping Functions"

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Drew Adams <drew.adams <at> oracle.com>
Subject: bug#78930: closed (Re: bug#78930: 30.1; (elisp) `Mapping Functions")
Date: Mon, 30 Jun 2025 19:08:02 +0000

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Your bug report

#78930: 30.1; (elisp) `Mapping Functions"

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 78930 <at> debbugs.gnu.org.

-- 
78930: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=78930
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Drew Adams <drew.adams <at> oracle.com>
Cc: 78930-done <at> debbugs.gnu.org
Subject: Re: bug#78930: 30.1; (elisp) `Mapping Functions"
Date: Mon, 30 Jun 2025 22:07:25 +0300

> Date: Mon, 30 Jun 2025 16:39:26 +0000
> From:  Drew Adams via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> On the one hand, this doc says that functions "mapcar, mapc, mapconcat,
> and mapcan, ...  map over a _list_".  On the other hand, it says that
> mapcar and mapcan map over a _sequence_ (except a char table) and return
> a list, and mapconcat maps over a sequence (except a char table) and
> returns a sequence of chars.

Thanks, fixed on the emacs-30 release branch, and closing the bug.

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From: Drew Adams <drew.adams <at> oracle.com>
To: "bug-gnu-emacs <at> gnu.org" <bug-gnu-emacs <at> gnu.org>
Subject: 30.1; (elisp) `Mapping Functions"
Date: Mon, 30 Jun 2025 16:39:26 +0000

On the one hand, this doc says that functions "mapcar, mapc, mapconcat,
and mapcan, ...  map over a _list_".  On the other hand, it says that
mapcar and mapcan map over a _sequence_ (except a char table) and return
a list, and mapconcat maps over a sequence (except a char table) and
returns a sequence of chars.

"Mapping over a <TYPE>" means that TYPE is the type of input.  All of
the mapping functions documented here map over _sequences_ (that are not
char tables).  They're not limited to mapping over _lists_.  Other
mapping functions mentioned (but not doc'd) here map over other
(non-sequence, non-list) types of collections.

The first sentence of the node is general enough, saying that a mapping
function maps over "a list or other collection".  But the next sentence
is problematic.  It should be enough to fix the second sentence (e.g.
by changing "list" to "sequence"; the rest of the node is OK.


In GNU Emacs 30.1 (build 2, x86_64-w64-mingw32) of 2025-02-23 built on
 AVALON
Windowing system distributor 'Microsoft Corp.', version 10.0.26100
System Description: Microsoft Windows 10 Pro (v10.0.2009.26100.4061)

Configured using:
 'configure --with-modules --without-dbus --with-native-compilation=aot
 --without-compress-install --with-tree-sitter CFLAGS=-O2
 prefix=/g/rel/install/emacs-30.1'

Configured features:
ACL GIF GMP GNUTLS HARFBUZZ JPEG LCMS2 LIBXML2 MODULES NATIVE_COMP
NOTIFY W32NOTIFY PDUMPER PNG RSVG SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XPM ZLIB

(NATIVE_COMP present but libgccjit not available)

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1252

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