[GHC] #4426: Simplify the rules for implicit quantification

[GHC]

#4426: Simplify the rules for implicit quantification
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        Reporter:  simonpj           |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  highest           |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  6.12.3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:  #7880             |  Differential Revisions:  Phab:D211
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Comment (by kanetw):

 Is anyone working on the changes Simon mentioned? Otherwise I'll go ahead
 and implement them.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4426#comment:22>
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