GNU bug report logs - #75592
29.4; Eglot Invalid Slot Name Error

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From: João Távora <joaotavora <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 75592-done <at> debbugs.gnu.org, zabolotko <at> gmail.com
Subject: bug#75592: Fwd: bug#75592: 29.4; Eglot Invalid Slot Name Error
Date: Sat, 1 Feb 2025 11:55:07 +0000

On Sat, Feb 1, 2025 at 11:51 AM Eli Zaretskii <eliz <at> gnu.org> wrote:
>
> > From: João Távora <joaotavora <at> gmail.com>
> > Date: Sat, 18 Jan 2025 19:51:45 +0000
> >
> > [Sorry forgot to send this to the bug tracker]
> >
> > On Sat, Jan 18, 2025 at 10:35 AM Eli Zaretskii <eliz <at> gnu.org> wrote:
> > >
> > > > From: Заболотько
> > > >  <zabolotko <at> gmail.com>
> > > > Date: Wed, 15 Jan 2025 19:33:47 +0300
> > > >
> > > > 1. Start 'emacs -Q'.
> > > > 2. M-x toggle-debug-on-error
> > > > 3. C-x d (open with dired directory with one file only) ~/development/temp/
> > > > 4. Open with dired the `hello.hs`file with following content:
> > > > main :: IO ()
> > > > main = putStrLn "Hello, World!"
> > > > 5. M-x eglot
> > > > 6. On prompt:
> > > > "[eglot] Couldn't guess LSP server for `fundamental-mode'
> > > > Enter program to execute (or <host>:<port>):" insert  (without double quotes):
> > > > "haskell-language-server-wrapper" (I use language server 2.9.0.1 installed from
> > > > https://www.haskell.org/ghcup/ )
> > > > 7. See *Backtrace* buffer with following content:
> > > > Debugger entered--Lisp error: (invalid-slot-name "#<eglot-lsp-server eglot-lsp-server-622e880>" :
> > > > events-buffer-config)
> >
> > > João, could you please look into this?
> >
> > The reporter probably isn't running the recipe they gave us.  If they did,
> > they wouldn't get the error, because Emacs -Q does not initialize the package
> > system automatically and so does not load in any eglot.el version that expects
> > eglot-lsp-server instances to have an events-buffer-config slot.
> >
> > So this is a mismatch between the Eglot and Jsonrpc package versions and
> > it is not triggered in Emacs 29.4 (the version reported by M-x report-emacs-bug)
> > when used with the -Q flag.
>
> Thanks.  No further comments within 2 weeks, so I'm now closing this
> bug.

OP contacted my directly and we confirmed it was a packaging system flub-up.
I assume the problem is solved.

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