[GHC] #10548: Support PartialTypeSignatures in Template Haskell

[GHC]

#10548: Support PartialTypeSignatures in Template Haskell
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        Reporter:  spinda            |                   Owner:
            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 spinda):

 I believe an implementation would consist of:

 (1) Add a {{{WildcardT (Maybe Name)}}} data constructor to the declaration
 of [https://github.com/ghc/ghc/blob/master/libraries/template-
 haskell/Language/Haskell/TH/Syntax.hs#L1464-L1483
 Language.Haskell.TH.Syntax.Type].

 (2) Add a new branch to
 [https://github.com/ghc/ghc/blob/058af6c90a0e8d122f2d1339b6b4fd0b5ec83d05/compiler/hsSyn/Convert.hs#L989
 cvtTypeKind] that translates this to either
 [https://downloads.haskell.org/~ghc/latest/docs/html/libraries/ghc/HsTypes.html#v:HsWildcardTy
 HsWildcardTy] or
 [https://downloads.haskell.org/~ghc/latest/docs/html/libraries/ghc/HsTypes.html#v:HsNamedWildcardTy
 HsNamedWildcardTy], depending on the {{{Maybe Name}}} value.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10548#comment:2>
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