bug#73849: 31.0.50; Binding ESC does not throw an error, but binding any M- combination afterwards does

bug#73849: 31.0.50; Binding ESC does not throw an error, but binding any M- combination afterwards does

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

If I eval the following

(progn (defvar-keymap test-map)
       (define-key test-map (kbd "ESC") #'test)
       (define-key test-map (kbd "M-i") #'test))

I get an error

(error "Key sequence M-i starts with non-prefix key ESC")

And I get the same error if I try to bind any other key combination
containing a Meta modifier, including ones which also contain other modifiers.
Crucially, I do not get an error while binding ESC itself, which I guess
is what should happen. The error only appears while trying to bind Meta
keys in the map containing ESC. It also doesn't seem to happen if I bind
M-i using a vector instead of kbd.

This was tried while starting Emacs without an
init.


In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.41, cairo version 1.18.0) of 2024-07-14 built on localhost
Repository revision: a44376432de78374017c2009163a9242acbf6355
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101013
System Description: Gentoo Linux

Configured using:
 'configure --prefix=/usr --build=x86_64-pc-linux-gnu
 --host=x86_64-pc-linux-gnu --mandir=/usr/share/man
 --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
 --localstatedir=/var/lib --datarootdir=/usr/share
 --disable-silent-rules --docdir=/usr/share/doc/emacs-31.0.9999
 --htmldir=/usr/share/doc/emacs-31.0.9999/html --libdir=/usr/lib64
 --program-suffix=-emacs-31-vcs --includedir=/usr/include/emacs-31-vcs
 --infodir=/usr/share/info/emacs-31-vcs --localstatedir=/var
 --enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp
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 --param=l1-cache-line-size=64 --param=l1-cache-size=32
 --param=l2-cache-size=512 -O2 -pipe -fno-fast-math -ffp-contract=off'
 CPPFLAGS= 'LDFLAGS=-Wl,-O1 -Wl,--as-needed
 -Wl,-z,pack-relative-relocs''

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

Important settings:
  value of $LANG: en_US.utf8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

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  yas-global-mode: t
  yas-minor-mode: t
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  global-aggressive-indent-mode: t
  aggressive-indent-mode: t
  org-roam-db-autosync-mode: t
  corfu-prescient-mode: t
  vertico-prescient-mode: t
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  corfu-mode: t
  marginalia-mode: t
  global-git-commit-mode: t
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  savehist-mode: t
  vertico-mode: t
  smart-mark-mode: t
  windmove-mode: t
  Info-breadcrumbs-in-mode-line-mode: t
  recentf-mode: t
  straight-use-package-mode: t
  straight-package-neutering-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
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  tab-bar-history-mode: t
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  file-name-shadow-mode: t
  global-font-lock-mode: t
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  blink-cursor-mode: t
  undelete-frame-mode: t
  minibuffer-regexp-mode: t
  line-number-mode: t
  global-visual-line-mode: t
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  transient-mark-mode: t
  auto-composition-mode: t
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bug#73849: 31.0.50; Binding ESC does not throw an error, but binding any M- combination afterwards does

[Eli Zaretskii]

> Date: Thu, 17 Oct 2024 10:18:18 +0000
> From:  Alexander Prähauser via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> If I eval the following
> 
> (progn (defvar-keymap test-map)
>        (define-key test-map (kbd "ESC") #'test)
>        (define-key test-map (kbd "M-i") #'test))
> 
> I get an error
> 
> (error "Key sequence M-i starts with non-prefix key ESC")
> 
> And I get the same error if I try to bind any other key combination
> containing a Meta modifier, including ones which also contain other modifiers.
> Crucially, I do not get an error while binding ESC itself, which I guess
> is what should happen. The error only appears while trying to bind Meta
> keys in the map containing ESC. It also doesn't seem to happen if I bind
> M-i using a vector instead of kbd.
> 
> This was tried while starting Emacs without an
> init.

I don't think this is a bug, this is how Emacs handling of Meta always
worked.

Stefan, any comments or suggestions?

bug#73849: 31.0.50; Binding ESC does not throw an error, but binding any M- combination afterwards does

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

> I don't think this is a bug, this is how Emacs handling of Meta always
> worked.

Yup.  It depends on `meta-prefix-char`, but I'd be surprised if we pay
enough attention to this var that it can be changed without
breaking everything.


        Stefan