bug#65447: 30.0.50; Gnus: No such function: nnfolder-server-opened

[Gerd Möllmann]

Gerd Möllmann <gerd.moellmann@gmail.com> writes:

> I get the following error when starting Gnus with M-x gnus.
>
>   No such function: nnfolder-server-opened
>
> The function nnfolder-server-opened is indeed defined nowhere I can
> find.  In case it matters, I had a Gnus autosave file.  After M-x gnus,
> I answered 'n' to the question if the autosave file should be used.
> After that, the error is signaled.

Once nnfolder is loaded, nnfolder-server-opened is defined as a
function.  It is defined by the macro

(nnoo-define-basics nnfolder)

in nnfolder.el.

I can work around this by manually requiring nnfolder in init.el.  Alas,
I don't know much about Gnus internals to determine what the right fix
would be.