GNU bug report logs - #70436
30.0.50; Fail to enter the debugger when using prin1 (instead of cl-prin1)

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From: Bruno Barbier <brubar.cs@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 30.0.50; Fail to enter the debugger when using prin1 (instead of
 cl-prin1)
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Hi,

When setting debugger-print-function to prin1, Emacs 30.0.50 may fail
to enter the debugger.

Emacs displays something like:

    Entering debugger...
    make-text-button: Args out of range: 67, 3000


The correct behavior is to enter the debugger, with something like this:

    Debugger entered--Lisp error: (wrong-type-argument stringp nil)
      #f(compiled-function (&rest args) "Start a program in a subprocess.  ...
      ...
      make-process(:name "mandatory" :command "ls" :stderr err-buf)

The problem doesn't occur with Emacs 29.3.

To manually reproduce, execute the following code block in a new Emacs
(started with '-Q'):

  #+begin_src elisp
    (progn 
      (setq debugger-print-function 'prin1)
      
      (defun my-useless-advice (fun &rest args)
         (apply fun args))

      (advice-add 'make-process :around #'my-useless-advice)

      (make-process :name "mandatory"
                    :command "ls"
                    :stderr 'err-buf))
  #+end_src
  
It seems that backtrace.el prints using prin1, but infers where the
button should be using cl-prin1.

My personal workaround is to stop setting debugger-print-function to
prin1 (I customized it a few years ago because I found that cl-prin1 was
really slow at the time, I guess it shouldn't be the case anymore).

Best,

Bruno


In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.18.0) of 2024-04-17 built on keynux
Windowing system distributor 'The X.Org Foundation', version 11.0.12101011
System Description: Gentoo Linux

Configured using:
 'configure --prefix=/home/bruno/local --with-x-toolkit=lucid
 --without-toolkit-scroll-bars --without-tree-sitter
 --without-native-compilation --without-modules --without-xwidgets
 --without-threads --without-pop --without-mailutils
 --without-compress-install --without-hesiod --without-gameuser
 --without-lcms2 --without-wide-int --without-kerberos
 --without-kerberos5 --with-sound=no --without-ns --without-gsettings
 --without-gconf --without-libotf --without-m17n-flt
 --with-gif=ifavailable --with-harfbuzz'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM HARFBUZZ JPEG LIBXML2
NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SQLITE3 TIFF WEBP X11 XDBE XIM
XINPUT2 XPM LUCID ZLIB

Important settings:
  value of $LC_CTYPE: en_US.UTF-8
  value of $LANG: C.UTF8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
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  global-eldoc-mode: t
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Load-path shadows:
None found.

Features:
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Memory information:
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