[GHC] #10548: Support PartialTypeSignatures in Template Haskell

[GHC]

#10548: Support PartialTypeSignatures in Template Haskell
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        Reporter:  spinda            |                   Owner:  thomasw
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Template Haskell  |                 Version:  7.10.1
      Resolution:                    |                Keywords:  newcomer
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by thomasw):

 I forgot to add that extra-constraints wild cards (`_ => ...`) have the
 same problem as named wild cards: they must be known before renaming.

 If people are ok with only having anonymous type wild cards in TH type
 splices, then I'll post a diff on Phabricator.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10548#comment:7>
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