bug#64106: `modify-services` no longer affects multiple instances of the same service

[Josselin Poiret]

merge 64106 63921
thankyou

Hi David,

"David Wilson" <david@daviwil.com> writes:

> Hi Guix!
>
> Recently there was a change to the behavior of `modify-services` that adds 
> logic to check for any unused clauses so that an exception can be raised to 
> alert the user of this case.
>
> https://git.savannah.gnu.org/cgit/guix.git/commit/?id=181951207339508789b28ba7cb914f983319920f
>
> It seems that the new logic has a bug that prevents a used clause from being 
> executed on more than one instance of a compatible service in a single 
> execution of `modify-services`.  Here's a new test case for 
> `gnu/tests/services.scm` that exhibits the issue:

This was intended, but was probably not a good idea.  I'll look into how
we could revert this while keeping the main idea of the change.

Best,
-- 
Josselin Poiret

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