[GHC] #9064: Support default class method signatures in Template Haskell

[GHC]

#9064: Support default class method signatures in Template Haskell
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              Reporter:  goldfire    |            Owner:  goldfire
                  Type:  feature     |           Status:  new
  request                            |        Milestone:
              Priority:  normal      |          Version:  7.8.2
             Component:  Template    |         Keywords:
  Haskell                            |     Architecture:  Unknown/Multiple
            Resolution:              |       Difficulty:  Unknown
      Operating System:              |       Blocked By:
  Unknown/Multiple                   |  Related Tickets:
       Type of failure:              |
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by goldfire):

 See [wiki:Design/TemplateHaskellGADTs] for a related change to the `Dec`
 type I'd like feedback on.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9064#comment:1>
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