[GHC] #13800: ghc panic: No skolem info: s_a7aK[sk]

[GHC]

#13800: ghc panic: No skolem info: s_a7aK[sk]
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        Reporter:  hexo              |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by mpickering):

 I tried reproducing this but didn't get very far. The project has a lot of
 dependencies, please can you provide a reproduction or precise
 instructions to build the project which don't involve stack?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13800#comment:1>
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