[GHC] #13885: Template Haskell doesn't freshen GADT type variables properly

[GHC]

#13885: Template Haskell doesn't freshen GADT type variables properly
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Template Haskell  |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 OK fine -- if someone wants to make this so it'd be fine by me.  But
 please comment the code so we know it's for convenience for clients rather
 than correctness.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13885#comment:4>
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