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

On 2021-04-29 13:54:05, Nicholas D. Steeves wrote:
> Hi Antoine and Lev!
> Antoine Beaupré <anarcat@debian.org> writes:
>> 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)
> I wonder if this "(package-initialize)" line, while using Emacs >= 27 is
> exposing a bug in lsp-mode?  Since Emacs 27 now automatically runs
> package-initialize in between the new early-init.el and the classic
> .emacs.el/init.el/etc, maybe lsp-mode has an autoload cookie that gets
> evaluated twice, leading to the broken state of the lsp sentinel?
> Alternatively, maybe lsp-mode now assumes we live in a post-Emacs 27
> world where all users have already dropped package-initialize from their
> configs?
> These Emacs >= 27 changes also affect the point in emacs init where
> package-enable-at-startup can be set:
>     If non-nil, packages are made available before reading the init file
>     (but after reading the early init file).  This means that if you
>     wish to set this variable, you must do so in the early init file.
> I think this bug is still valid and actionable even if removing
> package-initialize from the minimum reproducer, and/or after moving
> package-enable-at-startup to early-init.el makes the bug unreproducible.
> If nothing else, it seems like our src:emacs might need a NEWS entry on
> the topic, but that said, my suspicion is that lsp-mode could be more
> defensive.

So what you're saying is that in Emacs >= 27, I don't need the
package-initialize anymore and that will fix my bug?

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