Bug#987683: crashes with "Wrong type argument: (or eieio-object class), nil, obj"

[Antoine Beaupre <anarcat@debian.org>]

Package: elpa-esup
Version: 0.7.1-3
Severity: grave
Tags: upstream

This package is unusable in Debian 11 bullseye in its current
state. In my Emacs 1:27.1+1-3.1 session, i run M-x esup and I get:

error in process sentinel: Wrong type argument: (or eieio-object class), nil, obj

*Messages* has this:

Loading /usr/share/emacs/site-lisp/elpa/esup-0.7.1/esup-autoloads.el (source)...done
Starting esup...
esup process started on port 37851
at 1
error in process sentinel: slot-value: Wrong type argument: (or eieio-object class), nil, obj
error in process sentinel: Wrong type argument: (or eieio-object class), nil, obj

This is the upstream bug: https://github.com/jschaf/esup/issues/85

It looks like it is a packaging issue, since, according to the above
bug report, recompiling the .el files fixes the problem (haven't tested).

-- System Information:
Debian Release: 11.0
  APT prefers testing-security
  APT policy: (500, 'testing-security'), (500, 'testing-debug'), (500, 'testing'), (1, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.10.0-6-amd64 (SMP w/4 CPU threads)
Kernel taint flags: TAINT_FIRMWARE_WORKAROUND
Locale: LANG=fr_CA.UTF-8, LC_CTYPE=fr_CA.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages elpa-esup depends on:
ii  dh-elpa-helper  2.0.8
ii  emacsen-common  3.0.4

Versions of packages elpa-esup recommends:
ii  emacs              1:27.1+1-3.1
ii  emacs-gtk [emacs]  1:27.1+1-3.1

elpa-esup suggests no packages.

-- debconf-show failed