bug#75065: Upon archive download failure print the original error

[Konstantin Kharlamov]

On Thu, 2024-12-26 at 23:53 +0300, Konstantin Kharlamov wrote:
> Oh, actually, let me fix the other place as well then…
> 
> On Thu, 2024-12-26 at 23:51 +0300, Konstantin Kharlamov wrote:
> > On Thu, 2024-12-26 at 15:40 -0500, Stefan Monnier wrote:
> > > > The `car` seems to just contain word error. Here's how both
> > > > compare:
> > > > 
> > > > • current patch with `(cdr err)`:
> > > >     Failed to download ‘melpa’ archive. Error: ("Location
> > > > melpa.org/packages/ is not a url nor an absolute file name")
> > > > 
> > > > • suggested change with `err`:
> > > >     Failed to download ‘melpa’ archive. Error: (error "Location
> > > > melpa.org/packages/ is not a url nor an absolute file name")
> > > > 
> > > > I can of course remove the word `Error` in the second case.
> > > > My question then is: will `(car err)` always be the word
> > > > "error"?
> > > > Or
> > > > may there be another content?
> > > 
> > > The shape and content of `err` depends on the actual error that
> > > caused
> > > the download to fail.  `(car err)` contains the error "type",
> > > which
> > > can
> > > be `error` but can also be more specific such as
> > > `wrong-number-of-arguments`, `file-error`, ...
> > 
> > Thank you, I see!
> > 
> > Please check the attached patch. With this change the error of
> > accessing https-less address is shown as follows:
> > 
> >     Failed to download ‘melpa’ archive: (error "Location
> > melpa.org/packages/ is not a url nor an absolute file name")
> 

Done, please review 😊

1.patch
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