bug#54747: 28.1.50; package.el - Better error message if newer Emacs is required

[Lars Ingebrigtsen]

Daniel Mendler <mail@daniel-mendler.de> writes:

>> I forgot to mention the current error message. The message is for example:
>> 
>> "package emacs-27.1 unavailable"
>> 
>> See https://github.com/minad/vertico/issues/217 for the original bug
>> report when a user tried to install a package from GNU ELPA on Emacs 26,
>> while the package requires Emacs 27.
>
> On the other hand, `list-packages` refuses to mark the package as
> installable. So maybe nothing needs to be done here? In any case it is a
> very minor issue. You can probably judge better if people stumbled
> before over this error message. Otherwise feel free to close the issue!

I think it makes sense to make this error message better -- people may
be calling `package-install' explicitly.

It'd be easier to debug this if I had a recipe for reproduction, though.
Do you have one handy?

-- 
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   bloggy blog: http://lars.ingebrigtsen.no