[GHC] #2641: Revise the rules for -XExtendedDefaultRules (was: Revise the rules for -XExtendedDeafultRules)

[GHC]

#2641: Revise the rules for -XExtendedDefaultRules
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        Reporter:  simonpj           |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  lowest            |        Milestone:  7.6.2
       Component:  Compiler          |          Version:  6.8.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2641#comment:16>
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