bug#50219: 28.0.50; Provide better errors when trying to specialize on optional args in generic methods

[Lars Ingebrigtsen]

Eric Abrahamsen <eric@ericabrahamsen.net> writes:

> - the manual section on "Generic Functions" could say explicitly that
>   you can't specialize on optional arguments
> - `eval'ling the `defmethod' form above could raise an error directly
> - the compiler could say more explicitly what the problem is
>
> I'd favor all three of these changes!

Me, too.

> Happy to implement what I can (maybe not the compiler part).

I've added Stefan to the CCs; perhaps he has some comments.

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