[GHC] #13185: haskell-relational-query: ghc: panic! (the 'impossible' happened)

[GHC]

#13185: haskell-relational-query: ghc: panic! (the 'impossible' happened)
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        Reporter:  LocutusOfBorg     |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Compile-time      |            Test Case:  build
  crash or panic                     |  relational-query with ghc 8.0.2
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 It would be interesting to know how many ticks 7.10 requires. Currently
 it's unclear whether the package was previously just on the edge and was
 pushed over in 8.0, or whether 8.0 regressed significantly.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13185#comment:9>
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