bug#72131: 29.3; peg.el: syntax class character for symbol is '_', not 's'

bug#72131: 29.3; peg.el: syntax class character for symbol is '_', not 's'

[Jeff Trull]

[-- Attachment #1: Type: text/plain, Size: 23167 bytes --]

(require 'peg)
(with-temp-buffer
  (save-excursion (insert "_"))
  (peg-parse (syntax-class symbol)))

results in the message
"No merge-error method for: (syntax-class symbol)".

The root cause seems to be line 703 of peg.el where the syntax class
characters are defined. peg uses "s" for symbols instead of
"_". Correcting this results in a successful parse in the given code.



In GNU Emacs 29.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.41,
 cairo version 1.18.0) of 2024-03-31, modified by Debian built on
 lcy02-amd64-083
Windowing system distributor 'The X.Org Foundation', version 11.0.12101011
System Description: Ubuntu 24.04 LTS

Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/libexec
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-libsystemd --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/29.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/29.3/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils
 --with-native-compilation --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/libexec
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-libsystemd --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/29.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/29.3/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils
 --with-native-compilation --with-cairo --with-x=yes
 --with-x-toolkit=gtk3 --with-toolkit-scroll-bars 'CFLAGS=-g -O2
 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer
 -ffile-prefix-map=/build/emacs-0yuuFP/emacs-29.3+1=.
-fstack-protector-strong
 -fstack-clash-protection -Wformat -Werror=format-security
 -fcf-protection
 -fdebug-prefix-map=/build/emacs-0yuuFP/emacs-29.3+1=/usr/src/emacs-1:29.3+1-1ubuntu2
 -Wall' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=3'
 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES
NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3
THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM XINPUT2
XPM GTK3 ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: ERC

Minor modes in effect:
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-track-minor-mode: t
  erc-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  erc-networks-mode: t
  recentf-mode: t
  async-bytecomp-package-mode: t
  projectile-mode: t
  bury-successful-compilation: t
  shell-dirtrack-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

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/usr/share/emacs/29.3/lisp/org/org-refile
/home/jet/.config/emacs/elpa/org-9.7.5/ob-fortran hides
/usr/share/emacs/29.3/lisp/org/ob-fortran
/home/jet/.config/emacs/elpa/org-9.7.5/ob-sed hides
/usr/share/emacs/29.3/lisp/org/ob-sed
/home/jet/.config/emacs/elpa/org-9.7.5/org-src hides
/usr/share/emacs/29.3/lisp/org/org-src
/home/jet/.config/emacs/elpa/org-9.7.5/ob-ditaa hides
/usr/share/emacs/29.3/lisp/org/ob-ditaa
/home/jet/.config/emacs/elpa/org-9.7.5/ob-ref hides
/usr/share/emacs/29.3/lisp/org/ob-ref
/home/jet/.config/emacs/elpa/org-9.7.5/ol-gnus hides
/usr/share/emacs/29.3/lisp/org/ol-gnus
/home/jet/.config/emacs/elpa/org-9.7.5/org-goto hides
/usr/share/emacs/29.3/lisp/org/org-goto

Features:
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threads dbusbind inotify lcms2 dynamic-setting system-font-setting
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make-network-process native-compile emacs)

Memory information:
((conses 16 890461 133415)
 (symbols 48 67113 1)
 (strings 32 297233 11279)
 (string-bytes 1 8471700)
 (vectors 16 104617)
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bug#72131: 29.3; peg.el: syntax class character for symbol is '_', not 's'

[Eli Zaretskii]

> From: Jeff Trull <edaskel@att.net>
> Date: Mon, 15 Jul 2024 15:26:02 -0700
> 
> (require 'peg)
> (with-temp-buffer
>   (save-excursion (insert "_"))
>   (peg-parse (syntax-class symbol)))
> 
> results in the message
> "No merge-error method for: (syntax-class symbol)".
> 
> The root cause seems to be line 703 of peg.el where the syntax class
> characters are defined. peg uses "s" for symbols instead of
> "_". Correcting this results in a successful parse in the given code.

Stefan and Helmut, any comments or suggestions?

bug#72131: 29.3; peg.el: syntax class character for symbol is '_', not 's'

[Helmut Eller]

On Tue, Jul 16 2024, Eli Zaretskii wrote:

>> From: Jeff Trull <edaskel@att.net>
>> Date: Mon, 15 Jul 2024 15:26:02 -0700
>> 
>> (require 'peg)
>> (with-temp-buffer
>>   (save-excursion (insert "_"))
>>   (peg-parse (syntax-class symbol)))
>> 
>> results in the message
>> "No merge-error method for: (syntax-class symbol)".
>> 
>> The root cause seems to be line 703 of peg.el where the syntax class
>> characters are defined. peg uses "s" for symbols instead of
>> "_". Correcting this results in a successful parse in the given code.
>
> Stefan and Helmut, any comments or suggestions?

Yes, looks like "_" would the correct.  A method like

 (cl-defmethod peg--merge-error (merged (_ (eql syntax-class)) x)
   (cl-adjoin `(syntax-class ,x) merged :test #'equal))

is also missing and error messages like

  peg-signal-failure: Parse error at %d (expecting %S): 1, ("abc")

don't look right either.

The first thing to do would be to write a test.

bug#72131: 29.3; peg.el: syntax class character for symbol is '_', not 's'

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

>> The root cause seems to be line 703 of peg.el where the syntax class
>> characters are defined. peg uses "s" for symbols instead of
>> "_". Correcting this results in a successful parse in the given code.
>
> Stefan and Helmut, any comments or suggestions?

Indeed `s` doesn't exist as a syntax class, it should be `_`.


        Stefan

bug#72131: 29.3; peg.el: syntax class character for symbol is '_', not 's'

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Jeff Trull <edaskel@att.net>,  Helmut Eller <eller.helmut@gmail.com>,
>   72131@debbugs.gnu.org
> Date: Tue, 16 Jul 2024 09:04:09 -0400
> 
> >> The root cause seems to be line 703 of peg.el where the syntax class
> >> characters are defined. peg uses "s" for symbols instead of
> >> "_". Correcting this results in a successful parse in the given code.
> >
> > Stefan and Helmut, any comments or suggestions?
> 
> Indeed `s` doesn't exist as a syntax class, it should be `_`.

Since this was recently fixed on the emacs-30 branch, I'm now closing
the bug.