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

[GHC]

#10930: missing empty-Enumeration warning for `Natural`
-------------------------------------+-------------------------------------
        Reporter:  hvr               |                Owner:  hvr
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #7881, #10929     |  Differential Rev(s):  Phab:D1306
-------------------------------------+-------------------------------------
Changes (by hvr):

 * owner:   => hvr
 * differential:   => Phab:D1306


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10930#comment:1>
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