[GHC] #12145: GHC 8.0.1 compilier panic - find_tycon

[GHC]

#12145: GHC 8.0.1 compilier panic - find_tycon
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        Reporter:  highfly           |                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                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by mpickering):

 Please can you provide instructions to reproduce this?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12145#comment:2>
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