[GHC] #9840: Permit empty closed type families

[GHC]

#9840: Permit empty closed type families
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        Reporter:  adamgundry        |                   Owner:
            Type:  feature request   |                  Status:  patch
        Priority:  normal            |               Milestone:
       Component:  Compiler (Type    |                 Version:  7.8.3
  checker)                           |                Keywords:
      Resolution:                    |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:  #8028             |  Differential Revisions:  Phab:D841
-------------------------------------+-------------------------------------
Changes (by adamgundry):

 * status:  new => patch
 * differential:   => Phab:D841
 * related:   => #8028


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9840#comment:3>
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