[GHC] #13017: GHC panics during build of etkmett/free

[GHC]

#13017: GHC panics during build of etkmett/free
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        Reporter:  jbayardo          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Linux             |         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 hsyl20):

 Please show us the stack log obtained with `stack -v`

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13017#comment:7>
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