[GHC] #13199: TH-spliced class instances are pretty-printed incorrectly post-#3384

[GHC]

#13199: TH-spliced class instances are pretty-printed incorrectly post-#3384
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        Reporter:  RyanGlScott       |                Owner:  alanz
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by alanz):

 I think this is related to point 3 in the description of
 https://phabricator.haskell.org/D2752

 Basically `HsParTy` appears everywhere it needs to in the `ParsedSource`,
 but it somehow disappears through the renamer.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13199#comment:3>
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