[GHC] #14047: "Illegal instance for type synonym" while deriving Typeable1 for data type

[GHC]

#14047: "Illegal instance for type synonym" while deriving Typeable1 for data type
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        Reporter:  alexbiehl     |                Owner:  (none)
            Type:  bug           |               Status:  new
        Priority:  normal        |            Milestone:
       Component:  Compiler      |              Version:  8.2.1
      Resolution:                |             Keywords:
Operating System:  Windows       |         Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):
       Wiki Page:                |
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Comment (by alexbiehl):

 I should mention this actually worked with ghc-8.0.2 as it also uses a
 type synonym for `Typeable1`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14047#comment:2>
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