[GHC] #11714: Kind of (->) type constructor is overly constrained

[GHC]

#11714: Kind of (->) type constructor is overly constrained
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        Reporter:  bgamari           |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      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 bgamari):

 For what it's worth I took a stab at carrying out comment:3
 [[http://git.haskell.org/ghc.git/commitdiff/refs/heads/wip/generalized-
 arrow|here]]. At the moment I'm a bit stuck on how to deal with
 `Constraint`s. This appears to be yet another case where `* ~ Constraint`
 would simplify things.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11714#comment:5>
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