[GHC] #12843: Simplifier ticks exhausted When trying UnfoldingDone $

[GHC]

#12843: Simplifier ticks exhausted When trying UnfoldingDone $
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        Reporter:  MikolajKonarski   |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  invalid           |             Keywords:
Operating System:  Linux             |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12776 #12789     |  Differential Rev(s):
  #12675                             |
       Wiki Page:                    |
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Comment (by MikolajKonarski):

 BTW, should I open a new bug report with the panic I spotted in the travis
 log? (https://api.travis-ci.org/jobs/179766413/log.txt?deansi=true)

 {{{
 ghc: panic! (the 'impossible' happened)
   (GHC version 8.1.20161125 for x86_64-unknown-linux):
         Can't serialise IfaceTcTyVar
   u_aDzT[sk:1]
   Call stack:
       CallStack (from HasCallStack):
         prettyCurrentCallStack, called at
 compiler/utils/Outputable.hs:1076:58 in ghc:Outputable
         callStackDoc, called at compiler/utils/Outputable.hs:1080:37 in
 ghc:Outputable
         pprPanic, called at compiler/iface/IfaceType.hs:1331:10 in
 ghc:IfaceType
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12843#comment:12>
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