[GHC] #10039: Make Const (Control.Applicative) kind polymorphic in its second argument

[GHC]

#10039: Make Const (Control.Applicative) kind polymorphic in its second argument
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        Reporter:  Iceland_jack      |                   Owner:  ekmett
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Core Libraries    |                 Version:  7.8.4
      Resolution:                    |                Keywords:
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 ekmett):

 This may change if we decided to bring more of the "non-transformers" that
 sit in `transformers` into `base`, e.g. `Product` and `Sum` for functors
 can generalize

 {{{
 Product :: (k -> *) -> (k -> *) -> k -> *
 Sum :: (k -> *) -> (k -> *) -> k -> *
 }}}

 and the generalizations are quite useful.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10039#comment:8>
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