[GHC] #10404: GHC panic when creating a monomorphised pattern synonym for GADT

[GHC]

#10404: GHC panic when creating a monomorphised pattern synonym for GADT
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        Reporter:  Iceland_jack      |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1-rc1
      Resolution:                    |                Keywords:
Operating System:  Linux             |            Architecture:  x86
 Type of failure:  GHC rejects       |               Test Case:
  valid program                      |                Blocking:
      Blocked By:                    |  Differential Revisions:
 Related Tickets:                    |
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Comment (by Iceland_jack):

 I fear the existential makes my `Suc` example trickier than I thought,
 even though it's orthogonal to my question I welcome suggestions

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10404#comment:2>
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