[GHC] #10930: missing empty-Enumeration warning for `Natural`

[GHC]

#10930: missing empty-Enumeration warning for `Natural`
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           Reporter:  hvr            |             Owner:
               Type:  bug            |            Status:  new
           Priority:  low            |         Milestone:  8.0.1
          Component:  Compiler       |           Version:  7.10.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:  #7881, #10929
Differential Rev(s):                 |
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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10930>
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