[GHC] #2641: Make -XExtendedDeafultRules a bit less liberal

[GHC]

#2641: Make -XExtendedDeafultRules a bit less liberal
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    Reporter:  simonpj           |        Owner:                  
        Type:  feature request   |       Status:  new             
    Priority:  normal            |    Milestone:  6.12 branch     
   Component:  Compiler          |      Version:  6.8.3           
    Severity:  normal            |   Resolution:                  
    Keywords:                    |   Difficulty:  Unknown         
    Testcase:                    |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |  
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Comment (by simonpj):

 The new rules should also take account of #2854.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2641#comment:6>
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