[GHC] #12418: Make `MonadCont (ContT r m)` polykinded (r::k), (m::k -> Type)

[GHC]

#12418: Make `MonadCont (ContT r m)` polykinded (r::k), (m::k -> Type)
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        Reporter:  Iceland_jack      |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Core Libraries    |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 This is a Core Libraries Committee issue, right?

 As you point out, it's instance-specific (relevant for `MonadCont` but not
 for `Functor`, say.  So perhaps CLC should do as you implicitly suggest?
 I.e. change the relevant instances to
 {{{
 instance k ~ Type => MonadCont (ContT @k r m)
 }}}
 Of course, someone would have to do the homework to figure out what the
 "relevant" ones are.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12418#comment:6>
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