[GHC] #9186: GHC panic when compiling compdata

[GHC]

#9186: GHC panic when compiling compdata
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        Reporter:  snoyberg          |            Owner:
            Type:  bug               |           Status:  new
        Priority:  highest           |        Milestone:  7.8.3
       Component:  Compiler          |          Version:  7.8.2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by hvr):

 moreover, Simon suggested on `#ghc` that

 > if #9186 is a regression, it is almost certainly caused by
 2f8b4c9330b455d4cb31c186c747a7db12a69251, but it's probably best to just
 back that out if it's the last thing holding up the release

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9186#comment:5>
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