[bug#35935] [PATCH] guix: import: simplify recursive import

[Ludovic Courtès]

Hello Robert,

Robert Vollmert <address@hidden> skribis:

> This simplifies the logic of recursive-import, intending no
> major functional changes. The package import function is no
> longer called twice per package. Failed imports now make it
> to the package stream as '() instead of #f.
>
> * guix/import/utils.scm: Simplify recursive-import.
                         ^
Minor issue: please make sure to mention the modified entities here
(procedures, variables, etc.); see
<https://www.gnu.org/prep/standards/html_node/Change-Logs.html>.

I think Oleg worked on this part before; Oleg, could you comment
and/or apply?

‘tests/import-utils.scm’ doesn’t seem to be testing this procedure,
perhaps that’s something we should fix eventually.

Thanks,
Ludo’.