[GHC] #13929: GHC panic with levity polymorphism

[GHC]

#13929: GHC panic with levity polymorphism
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        Reporter:  vagarenko         |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.2
       Component:  Compiler          |              Version:  8.2.1-rc2
      Resolution:                    |             Keywords:  TypeInType,
                                     |  LevityPolymorphism
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"018c40fb1bb27853d0cefa5b90a44ce13e91a856/ghc"
 018c40fb/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="018c40fb1bb27853d0cefa5b90a44ce13e91a856"
 desugar: Catch levity polymorphism in unboxed sum expressions

 Fixes #13929.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13929#comment:20>
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