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Services can now have a default value

From: Ludovic Courtès
Subject: Services can now have a default value
Date: Sun, 16 Apr 2017 00:51:30 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)

Hello Guix!

With commit 1bb895eabf74a1e571887eb1521915e668a5c28d, service types can
declare a default value for their instances.  After this one can write:

  (service openssh-service-type)

instead of:

  (service openssh-service-type (openssh-configuration))

A bit of typing saved!

Note that this changes breaks the ABI for services, so make sure to run
“make clean-go && make”.

Feedback welcome!


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