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

[Antoine Beaupré <anarcat@debian.org>]

On 2021-04-28 23:07:26, Lev Lamberov wrote:
> Ср 28 апр 2021 @ 11:44 Antoine Beaupré <anarcat@debian.org>:
>
>> On 2021-04-28 20:34:26, Lev Lamberov wrote:
>>> It makes it a bit trickier. There another package, elpa-bug-hunter
>>> [elpa-bug-hunter], which automatically debug and bisect your init.el or
>>> .emacs file. It may be worth t try it with your config.
>>>
>>> [elpa-bug-hunter] https://tracker.debian.org/pkg/elisp-bug-hunter
>>
>> Actually, do you know how I would use bug-hunter and esup together? It
>> seems they *both* start a separate emacs process to debug the startup,
>> and thus would be in conflict with each other...
>
> Guess, you may start Emacs as usual, then edit your configuration to run
> esup (that is, run it as a last line of your config), and then run
> bug-hunter. Probably, it will work. Or not. At least, it's worth a try.

That didn't work, but I manually bisected my .emacs.d/init.el file and
came up with this minimal reproducer:

(when (require 'package nil t)
  (setq-default
   load-prefer-newer t
   package-enable-at-startup nil)
  (package-initialize)
  (setq package-archives '(("gnu" . "https://elpa.gnu.org/packages/";)
			  ("melpa" . "https://melpa.org/packages/";)))
  ;; in elpa-use-package debian package since stretch
  (unless (package-installed-p 'use-package)
    (package-refresh-contents)
    (package-install 'use-package)))

(eval-when-compile
  (require 'use-package)
  (setq-default
   use-package-always-defer nil
   use-package-always-ensure t))

(use-package lsp-mode
  :commands (lsp lsp-deferred)
  :demand t
  ;;:init
  ;;(setq lsp-keymap-prefix "C-c l")
  ;; TODO: https://emacs-lsp.github.io/lsp-mode/page/performance/
  ;; also note re "native compilation": <+varemara> it's the
  ;; difference between lsp-mode being usable or not, for me
  :config
  (setq lsp-auto-configure t))

It could probably be trimmed down more, and i suspect the 'lsp-mode' bit
is a red-herring: any package would probably trigger it.

A.

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