[GHC] #14477: the 'impossible' happened, initTc: unsolved constraints

[GHC]

#14477: the 'impossible' happened, initTc: unsolved constraints
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           Reporter:  bmusin          |             Owner:  (none)
               Type:  bug             |            Status:  new
           Priority:  high            |         Milestone:
          Component:  Compiler        |           Version:  8.0.2
           Keywords:                  |  Operating System:  Linux
       Architecture:  x86_64 (amd64)  |   Type of failure:  None/Unknown
          Test Case:                  |        Blocked By:
           Blocking:                  |   Related Tickets:
Differential Rev(s):                  |         Wiki Page:
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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14477>
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