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

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

From: Alexander Prähauser <ahprae <at> protonmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50;
 Binding ESC does not throw an error, but binding any M- combination
 afterwards does
Date: Thu, 17 Oct 2024 10:18:18 +0000

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
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 --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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 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
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Memory information:
((conses 16 5496537 2879413) (symbols 48 154375 113) (strings 32 675888 137800)
 (string-bytes 1 52217422) (vectors 16 227713) (vector-slots 8 3782453 759708)
 (floats 8 10949 14121) (intervals 56 361312 44168) (buffers 992 439))

Message #8 received at 73849 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Alexander Prähauser <ahprae <at> protonmail.com>,
 Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 73849 <at> debbugs.gnu.org
Subject: Re: bug#73849: 31.0.50;
 Binding ESC does not throw an error, but binding any M- combination
 afterwards does
Date: Thu, 17 Oct 2024 14:05:55 +0300

> 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 <at> 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?

Message #11 received at 73849 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Alexander Prähauser <ahprae <at> protonmail.com>,
 73849 <at> debbugs.gnu.org
Subject: Re: bug#73849: 31.0.50; Binding ESC does not throw an error, but
 binding any M- combination afterwards does
Date: Thu, 17 Oct 2024 14:30:48 -0400

> 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

Message #16 received at 73849-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: ahprae <at> protonmail.com, 73849-done <at> debbugs.gnu.org
Subject: Re: bug#73849: 31.0.50; Binding ESC does not throw an error, but
 binding any M- combination afterwards does
Date: Sun, 27 Oct 2024 12:39:51 +0200

> From: Stefan Monnier <monnier <at> iro.umontreal.ca>
> Cc: Alexander Prähauser <ahprae <at> protonmail.com>,
>   73849 <at> debbugs.gnu.org
> Date: Thu, 17 Oct 2024 14:30:48 -0400
> 
> > 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.

I'm therefore closing this bug.

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