[GHC] #15549: Core Lint error with EmptyCase

[GHC]

#15549: Core Lint error with EmptyCase
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler (Type    |              Version:  8.4.3
  checker)                           |             Keywords:  TypeFamilies,
      Resolution:                    |  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Compile-time      |            Test Case:
  crash or panic                     |  typecheck/should_compile/T15549[ab]
      Blocked By:                    |             Blocking:
 Related Tickets:  #14729            |  Differential Rev(s):
       Wiki Page:                    |  https://gitlab.haskell.org/ghc/ghc/merge_requests/208
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Comment (by bgamari):

 For what it's worth it seems to apply cleanly to `ghc-8.8`. Let's try
 merging.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15549#comment:10>
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