[GHC] #7687: ghc panic on TH and deriveJSON

[GHC]

#7687: ghc panic on TH and deriveJSON
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        Reporter:  guest             |                   Owner:
            Type:  bug               |                  Status:  infoneeded
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Template Haskell  |                 Version:  7.4.2
      Resolution:                    |                Keywords:  TH
Operating System:  Windows           |            Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash                              |               Test Case:
      Blocked By:  3658              |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Changes (by Phyx-):

 * status:  new => infoneeded


Comment:

 I get the same error @George got. So something changed in aeson and/or
 hashable. I'll mark this as info needed as two people couldn't reproduce
 it on a newer GHC

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7687#comment:8>
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