GNU bug report logs - #47572
27.1; (setf (map-elt m key) value) should return value but does not

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Package: emacs;

Reported by: Matt Armstrong <matt <at> rfc20.org>

Date: Fri, 2 Apr 2021 21:09:02 UTC

Severity: normal

Tags: fixed

Found in versions 27.1, 25.3.1

Fixed in version 28.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#47572; Package emacs. (Fri, 02 Apr 2021 21:09:02 GMT) Full text and rfc822 format available.
Acknowledgement sent to Matt Armstrong <matt <at> rfc20.org>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Fri, 02 Apr 2021 21:09:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Matt Armstrong <matt <at> rfc20.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.1; (setf (map-elt m key) value) should return value but does not
Date: Fri, 02 Apr 2021 14:08:16 -0700

[Message part 1 (text/plain, inline)]
Attached is an ert test that demonstrates the problem.  The crux is
that:

  (require 'map)
  (setf (map-elt m key) value)

returns VALUE only in the hash table implementation.  `setf' should
return VALUE in all cases.

For alists it returns either nil or (key . value) depending on whether a
key is inserted or udpated in place.  For plists it returns similarly
variable things.

Here is the output I get from the attached test.  The .el is attached afterwards.

F test-map-setf-alist-insert-key
    (ert-test-failed
     ((should
       (equal
        (setf
         (map-elt alist ...)
         'value)
        'value))
      :form
      (equal
       ((key . value))
       value)
      :value nil :explanation
      (different-types
       ((key . value))
       value)))

F test-map-setf-alist-overwrite-key
    (ert-test-failed
     ((should
       (equal
        (setf
         (map-elt alist ...)
         'value2)
        'value2))
      :form
      (equal nil value2)
      :value nil :explanation
      (different-atoms nil value2)))

F test-map-setf-plist-insert-key
    (ert-test-failed
     ((should
       (equal
        (setf
         (map-elt plist ...)
         'value2)
        'value2))
      :form
      (equal
       (key value key2 value2)
       value2)
      :value nil :explanation
      (different-types
       (key value key2 value2)
       value2)))

F test-map-setf-plist-overwrite-key
    (ert-test-failed
     ((should
       (equal
        (setf
         (map-elt plist ...)
         'value2)
        'value2))
      :form
      (equal
       (key value2)
       value2)
      :value nil :explanation
      (different-types
       (key value2)
       value2)))


[setf.el (application/emacs-lisp, attachment)]
[Message part 3 (text/plain, inline)]


In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.23, cairo version 1.16.0)
 of 2020-11-07, modified by Debian built on x86-ubc-01
Windowing system distributor 'The X.Org Foundation', version 11.0.12010000
System Description: Debian GNU/Linux bullseye/sid

Recent messages:
Save file /home/matt/git/overplay/setf.el? (y, n, !, ., q, C-r, C-f, d or C-h) y
Saving file /home/matt/git/overplay/setf.el...
Wrote /home/matt/git/overplay/setf.el
Reverting buffer ‘setf.el’.
Mark set
Mark saved where search started
Quit [2 times]
Mark set
Mark saved where search started
Reverting buffer ‘setf.el’. [4 times]

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/usr/share/emacs/site-lisp/elpa/use-package-2.4.1/use-package-delight hides /usr/share/emacs/site-lisp/elpa-src/use-package-2.4.1/use-package-delight
/usr/share/emacs/site-lisp/elpa/use-package-2.4.1/use-package-pkg hides /usr/share/emacs/site-lisp/elpa-src/use-package-2.4.1/use-package-pkg
/usr/share/emacs/site-lisp/elpa/use-package-2.4.1/use-package-bind-key hides /usr/share/emacs/site-lisp/elpa-src/use-package-2.4.1/use-package-bind-key
/usr/share/emacs/site-lisp/elpa/use-package-2.4.1/use-package-diminish hides /usr/share/emacs/site-lisp/elpa-src/use-package-2.4.1/use-package-diminish
/usr/share/emacs/site-lisp/elpa/use-package-2.4.1/use-package-lint hides /usr/share/emacs/site-lisp/elpa-src/use-package-2.4.1/use-package-lint
/usr/share/emacs/site-lisp/elpa/use-package-2.4.1/use-package-autoloads hides /usr/share/emacs/site-lisp/elpa-src/use-package-2.4.1/use-package-autoloads
/usr/share/emacs/site-lisp/elpa/use-package-2.4.1/use-package-jump hides /usr/share/emacs/site-lisp/elpa-src/use-package-2.4.1/use-package-jump
/usr/share/emacs/site-lisp/elpa/use-package-2.4.1/use-package hides /usr/share/emacs/site-lisp/elpa-src/use-package-2.4.1/use-package
/usr/share/emacs/site-lisp/elpa/use-package-2.4.1/use-package-core hides /usr/share/emacs/site-lisp/elpa-src/use-package-2.4.1/use-package-core
/usr/share/emacs/site-lisp/elpa/with-editor-3.0.2/with-editor-autoloads hides /usr/share/emacs/site-lisp/elpa-src/with-editor-3.0.2/with-editor-autoloads
/usr/share/emacs/site-lisp/elpa/with-editor-3.0.2/with-editor hides /usr/share/emacs/site-lisp/elpa-src/with-editor-3.0.2/with-editor
/usr/share/emacs/site-lisp/elpa/with-editor-3.0.2/with-editor-pkg hides /usr/share/emacs/site-lisp/elpa-src/with-editor-3.0.2/with-editor-pkg

Features:
(shadow sort mail-extr emacsbug sendmail trace flymake-proc flymake
warnings two-column iso-transl etags fileloop cap-words superword
subword cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align
cc-engine cc-vars cc-defs find-dired ffap grep compile edebug hackroexp
pulse xref project cl-print ielm bug-reference face-remap mule-util
checkdoc lisp-mnt magit-extras dabbrev eieio-opt speedbar sb-image
ezimage dframe help-fns radix-tree misearch multi-isearch copyright msb
bench-test ert pp ewoc debug backtrace bench pcase rx let-alist align
vc-git tramp tramp-loaddefs trampver tramp-integration files-x
tramp-compat ls-lisp org-element avl-tree generator ol-w3m ol-rmail
ol-mhe ol-irc ol-info ol-gnus nnir gnus-sum url url-proxy url-privacy
url-expand url-methods url-history shr url-cookie url-domsuf url-util
svg xml dom gnus-group gnus-undo gnus-start gnus-cloud nnimap nnmail
mail-source utf7 netrc nnoo parse-time iso8601 gnus-spec gnus-int
gnus-range gnus-win gnus nnheader ol-eww ol-docview doc-view jka-compr
image-mode exif ol-bibtex bibtex ol-bbdb winner cus-start cus-load
org-protocol org ob ob-tangle ob-ref ob-lob ob-table ob-exp org-macro
org-footnote org-src ob-comint org-pcomplete org-list org-faces
org-entities noutline outline org-version ob-emacs-lisp ob-core ob-eval
org-table org-keys org-loaddefs find-func notmuch hl-line notmuch-tree
notmuch-jump notmuch-hello wid-edit notmuch-show notmuch-print
notmuch-crypto notmuch-mua notmuch-message notmuch-draft
notmuch-maildir-fcc notmuch-address notmuch-company notmuch-parser
notmuch-wash coolj notmuch-query goto-addr icalendar diary-lib
diary-loaddefs cal-menu calendar cal-loaddefs notmuch-tag notmuch-lib
notmuch-version notmuch-compat mm-view mml-smime smime dig mailcap
edmacro kmacro protbuf ol-notmuch ol org-compat org-macs skeleton
autoinsert time keyfreq icomplete highlight-symbol thingatpt
magit-submodule magit-obsolete magit-blame magit-stash magit-reflog
magit-bisect magit-push magit-pull magit-fetch magit-clone magit-remote
magit-commit magit-sequence magit-notes magit-worktree magit-tag
magit-merge magit-branch magit-reset magit-files magit-refs magit-status
magit magit-repos magit-apply magit-wip magit-log which-func imenu
magit-diff smerge-mode diff diff-mode magit-core magit-autorevert
autorevert filenotify magit-margin magit-transient magit-process
magit-mode git-commit transient magit-git magit-section magit-utils crm
log-edit message rmc puny dired dired-loaddefs format-spec rfc822 mml
mml-sec epa derived epg epg-config gnus-util rmail rmail-loaddefs
text-property-search time-date mm-decode mm-bodies mm-encode mail-parse
rfc2231 rfc2047 rfc2045 mm-util ietf-drums mail-prsvr mailabbrev
mail-utils gmm-utils mailheader pcvs-util add-log with-editor shell
pcomplete comint ansi-color ring server dash ido which-key advice
cl-extra help-mode use-package use-package-ensure use-package-delight
use-package-diminish use-package-bind-key bind-key easy-mmode
use-package-core paren elec-pair finder-inf info slime-autoloads package
easymenu browse-url url-handlers url-parse auth-source cl-seq eieio
eieio-core cl-macs eieio-loaddefs password-cache json subr-x map
url-vars seq byte-opt gv bytecomp byte-compile cconv cl-loaddefs cl-lib
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel term/x-win x-win term/common-win x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list replace newcomment text-mode elisp-mode
lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow isearch
timer select scroll-bar mouse jit-lock font-lock syntax facemenu
font-core term/tty-colors frame minibuffer cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote threads dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
cairo move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 815018 112088)
 (symbols 48 41019 1)
 (strings 32 204120 12260)
 (string-bytes 1 5745296)
 (vectors 16 67539)
 (vector-slots 8 846957 125852)
 (floats 8 660 654)
 (intervals 56 33671 2009)
 (buffers 1000 68))
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#47572; Package emacs. (Sun, 04 Apr 2021 18:33:02 GMT) Full text and rfc822 format available.

Message #8 received at 47572 <at> debbugs.gnu.org (full text, mbox):

From: "Basil L. Contovounesios" <contovob <at> tcd.ie>
To: Matt Armstrong <matt <at> rfc20.org>
Cc: 47572 <at> debbugs.gnu.org
Subject: Re: bug#47572: 27.1; (setf (map-elt m key) value) should return
 value but does not
Date: Sun, 04 Apr 2021 19:31:48 +0100

found 47572 25.3.1
quit

Matt Armstrong <matt <at> rfc20.org> writes:

> Attached is an ert test that demonstrates the problem.  The crux is
> that:
>
>   (require 'map)
>   (setf (map-elt m key) value)
>
> returns VALUE only in the hash table implementation.  `setf' should
> return VALUE in all cases.
>
> For alists it returns either nil or (key . value) depending on whether a
> key is inserted or udpated in place.

Indeed, this bug seems to be present since map.el was introduced in
Emacs 25.

> For plists it returns similarly variable things.
>
> Here is the output I get from the attached test.  The .el is attached afterwards.

Would you be interested in also providing a patch for map.el?

Thanks,

-- 
Basil
bug Marked as found in versions 25.3.1. Request was from "Basil L. Contovounesios" <contovob <at> tcd.ie> to control <at> debbugs.gnu.org. (Sun, 04 Apr 2021 18:33:02 GMT) Full text and rfc822 format available.
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#47572; Package emacs. (Thu, 06 May 2021 11:32:02 GMT) Full text and rfc822 format available.

Message #13 received at 47572 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Matt Armstrong <matt <at> rfc20.org>
Cc: 47572 <at> debbugs.gnu.org
Subject: Re: bug#47572: 27.1; (setf (map-elt m key) value) should return
 value but does not
Date: Thu, 06 May 2021 13:31:42 +0200

Matt Armstrong <matt <at> rfc20.org> writes:

> Attached is an ert test that demonstrates the problem.  The crux is
> that:
>
>   (require 'map)
>   (setf (map-elt m key) value)
>
> returns VALUE only in the hash table implementation.  `setf' should
> return VALUE in all cases.
>
> For alists it returns either nil or (key . value) depending on whether a
> key is inserted or udpated in place.  For plists it returns similarly
> variable things.

Thanks; I've included your tests in Emacs 28, and fixed the map-elt code
(hopefully; it passes all the tests, at least).

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Added tag(s) fixed. Request was from Lars Ingebrigtsen <larsi <at> gnus.org> to control <at> debbugs.gnu.org. (Thu, 06 May 2021 11:32:02 GMT) Full text and rfc822 format available.
bug marked as fixed in version 28.1, send any further explanations to 47572 <at> debbugs.gnu.org and Matt Armstrong <matt <at> rfc20.org> Request was from Lars Ingebrigtsen <larsi <at> gnus.org> to control <at> debbugs.gnu.org. (Thu, 06 May 2021 11:32:02 GMT) Full text and rfc822 format available.
bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Fri, 04 Jun 2021 11:24:06 GMT) Full text and rfc822 format available.
This bug report was last modified 4 years and 30 days ago.

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