[GHC] #10707: -fth-dec-file outputs invalid case clauses

[GHC]

#10707: -fth-dec-file outputs invalid case clauses
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        Reporter:  Fabian            |                Owner:  bollmann
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Template Haskell  |              Version:  7.10.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10701            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bollmann):

 Upon a first investigation, it seems that the pretty printer in
 `Language.Haskell.TH.Ppr` functions correctly (at least concerning the
 parentheses around the lambda abstraction).

 It hence seems as if the pretty printer that is actually called when
 dumping the splice via -dth-dec-file is not
 `Language.Haskell.TH.Ppr.pprint`? I will investigate this further...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10707#comment:9>
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