[GHC] #14443: Add a plugin phase that allows users to modify HsSyn before the desugarer

[GHC]

#14443: Add a plugin phase that allows users to modify HsSyn before the desugarer
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        Reporter:  ocharles          |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      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 ocharles):

 > Meanwhile, can't you already do this with Template Haskell (with a bit
 of more syntactic noise)?

 I don't believe I can, as I need access to the type checker to see which
 things I can `Show`.

 Thanks for the link to Native Metaprogramming, I'll have a read.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14443#comment:2>
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