bug#73500: eglot: diagnostic location not always shown

[Federico Beffa via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

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A few questions:
* have you checked the provided lsp*.log files which show that the 
diagnostics is sent?
* have you checked the provided screenshots showing an exclamation mark 
in the fringe but no underlining?
* How do you explain the exclamation mark in the fringe which doess not 
appear if eglot is not enabled?
* Do you also see the exclamation mark in the fringe on the line in 
question?
* Does "cabal run" works? Do you see the output? If not please provide 
the complete error message.

If cabal is not working properly then you'll not see any diagnostics 
because the `bug73500.cabal` file includes a compiler directive to 
display all warnings.

Please provide the full `eglot-events-buffer` transcript.

Two `xx` still don't cause underlining.

On 29/09/2024 23:18, João Távora wrote:
> On Sun, Sep 29, 2024 at 7:59 PM Federico Beffa
> <federico.beffa@fbengineering.ch> wrote:
>> Sure, no problem and nothing changes, the bug is still there.
> So far, there is one sighting of it: yours.  If I were you I would try
> out the modified Main.hs program and report if you see the underlined
> second x.
>
> If you didn't know, Eglot has virtually 0 haskell-specific code (much
> as it has 0 foo-specific code for any language foo).
>
> João

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