[GHC] #10820: Provide a way to detect what extensions are enabled via TH

[GHC]

#10820: Provide a way to detect what extensions are enabled via TH
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        Reporter:  spinda            |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Template Haskell  |                 Version:  7.10.2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by goldfire):

 Bah. Of course you're right. And I don't think it's a great idea to depend
 on `Cabal` because that package can be upgraded independently of GHC.
 Correct me if this wouldn't cause pain.

 I guess we could have Yet Another List Of Extensions.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10820#comment:4>
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