[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:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:  #7880             |                Blocking:
                                     |  Differential Revisions:  Phab:D211
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Changes (by liyang):

 * cc: ghc.haskell.org@… (added)


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4426#comment:21>
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