[GHC] #9628: Add Annotations to the AST to simplify source to source conversions

[GHC]

#9628: Add Annotations to the AST to simplify source to source conversions
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              Reporter:  alanz       |            Owner:  alanz
                  Type:  feature     |           Status:  new
  request                            |        Milestone:
              Priority:  normal      |          Version:  7.9
             Component:  Compiler    |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:  D297        |
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Comment (by alanz):

 Status report.

 Using Phab:D297 applied to head, [https://github.com/alanz/ghc-
 exactprint/tree/ghc-7.9 ghc-exactprint] is able to fully reproduce the
 module header and exports of a haskell source file.

 Working with the annotations feels natural, and it works.

 Also, there has been no feedback, adverse or otherwise on wether this is
 the right approach.

 Given that HaRe will be the primary user initially, I would be happy to go
 ahead with this.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9628#comment:34>
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