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From: Philipp Stephani
Newsgroups: gmane.emacs.bugs
Subject: bug#53071: 28.0.90;
Emacs 28 regression: incorrect code generation for complex pcase
forms?
Date: Fri, 07 Jan 2022 10:36:03 +0100
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Archived-At:
I hit the following subtle Edebug regression in Emacs 28:
Create a file /tmp/pcase-edebug.el with these contents:
$ cat /tmp/pcase-edebug.el=20
;; -*- lexical-binding: t; -*-
(require 'rx)
(defun f (a)
(pcase a
((rx bos (let q (opt (let r nonl)) (let a nonl)))
(message "%s" a))
((rx bos eos)
(message "%s" a))))
Visit the file in Emacs:
$ emacs -Q -l rx /tmp/pcase-edebug.el
Move point into the `f' function and instrument it using C-u C-M-x.
Then, byte-compile `f' using M-: (byte-compile 'f).
In Emacs 28, this will generate the following warnings:
Warning: Unused lexical variable `q'
Warning: Unused lexical variable `r'
Warning: reference to free variable =E2=80=98a=E2=80=99
The first two are expected, the third one is not.
Indeed, M-: (f "ab") and stepping through the code will signal an error:
Symbol's value as variable is void: a
This doesn't happen in Emacs 27, so I think it should be fixed on the
release branch before releasing Emacs 28.
In GNU Emacs 28.0.90 (build 12, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, =
cairo version 1.16.0)
of 2022-01-05
Repository revision: c0cfbca311e6e07e9f8b9c1c9d0e2fe9792cd08c
Repository branch: emacs-28
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux rodete
Configured using:
'configure --enable-gcc-warnings=3Dwarn-only
--enable-gtk-deprecation-warnings --without-pop --with-mailutils
--enable-checking=3Dall --enable-check-lisp-object-type --with-modules
'CFLAGS=3D-O0 -ggdb3''
Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG SECCOMP
SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM GTK3 ZLIB
Important settings:
value of $LC_TIME: en_DK.utf8
value of $LANG: en_US.utf8
value of $XMODIFIERS: @im=3Dibus
locale-coding-system: utf-8-unix
Major mode: Lisp Interaction
Minor modes in effect:
tooltip-mode: t
global-eldoc-mode: t
eldoc-mode: t
show-paren-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
tool-bar-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
line-number-mode: t
indent-tabs-mode: t
transient-mark-mode: t
Load-path shadows:
None found.
Features:
(shadow sort mail-extr emacsbug sendmail phst skeleton edmacro kmacro
pcase ffap thingatpt url url-proxy url-privacy url-expand url-methods
url-history url-cookie url-domsuf url-util url-parse url-vars mailcap rx
message rmc dired dired-loaddefs rfc822 mml mml-sec epa derived epg
rfc6068 epg-config gnus-util rmail rmail-loaddefs auth-source cl-seq
eieio eieio-core cl-macs eieio-loaddefs password-cache json map
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 gnutls puny elp dbus xml subr-x seq byte-opt gv bytecomp
byte-compile cconv compile text-property-search comint ansi-color ring
cl-loaddefs cl-lib iso-transl tooltip eldoc paren electric uniquify
ediff-hook vc-hooks lisp-float-type elisp-mode 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 lisp-mode prog-mode register
page tab-bar menu-bar rfn-eshadow isearch easymenu timer select
scroll-bar mouse jit-lock font-lock syntax 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 emoji-zwj charscript charprop case-table epa-hook
jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice button
loaddefs faces cus-face macroexp files window text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote threads dbusbind inotify
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 69586 8115)
(symbols 48 8528 3)
(strings 32 24811 2252)
(string-bytes 1 802373)
(vectors 16 15668)
(vector-slots 8 207469 17113)
(floats 8 29 46)
(intervals 56 228 0)
(buffers 992 11))
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