[GHC] #13551: Support DEPRECATED and WARNING pragmas on Template Haskell

[GHC]

#13551: Support DEPRECATED and WARNING pragmas on Template Haskell
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           Reporter:  utdemir        |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  low            |         Milestone:
          Component:  Template       |           Version:  8.0.1
  Haskell                            |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 I'm writing TH function from some JSON spec to Haskell data structures.
 Some fields are marked as deprecated in the spec, therefore I want to mark
 the accessors to those fields with DEPRECATED pragma, but as far as I can
 see, TH does not support this.

 I'm aware that module level DEPRECATED pragma is impossible in TH, but I
 still want to be able to tag top-level attributes as DEPRECATED.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13551>
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