[GHC] #8510: Clear up what extensions are needed at a Template Haskell splice site

[GHC]

#8510: Clear up what extensions are needed at a Template Haskell splice site
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        Reporter:  simonpj           |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by simonpj):

 Note that if `cleverThFunction` uses explicit data constructors to
 construct a syntax tree, it doesn't need ANY language extension flags.
 Maybe that is acceptable.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8510#comment:1>
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