[GHC] #15883: GHC panic: newtype F rep = F (forall (a :: TYPE rep). a)

[GHC]

#15883: GHC panic: newtype F rep = F (forall (a :: TYPE rep). a)
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        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.6.2
  checker)                           |             Keywords:
      Resolution:                    |  LevityPolymorphism, TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by andrewthad):

 This is fixed (rather accidentally) by the implementation of the
 `UnliftedNewtypes` proposal, which is not yet merged.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15883#comment:4>
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