services: shepherd: Clarify error message about missing service.
Suggested by Tobias Geerinckx-Rice <me@tobias.gr>. * gnu/services/shepherd.scm (assert-valid-graph)[assert-satisfied-requirements]: Clarify error message.
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@ -175,7 +175,7 @@ assertion failure."
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(&message
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(&message
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(message
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(message
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(format #f (_ "service '~a' requires '~a', \
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(format #f (_ "service '~a' requires '~a', \
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which is undefined")
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which is not provided by any service")
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(match (shepherd-service-provision service)
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(match (shepherd-service-provision service)
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((head . _) head)
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((head . _) head)
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(_ service))
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(_ service))
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