[GHC] #6089: Allow declaration splices inside declaration brackets

[GHC]

#6089: Allow declaration splices inside declaration brackets
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        Reporter:  igloo             |                   Owner:  simonpj
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Template Haskell  |                 Version:  7.4.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by ezyang):

 The renamer splices and then typechecks now, so we should be able to do
 this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/6089#comment:6>
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