[GHC] #3460: Can't use superclass when type coercions are involved

[GHC]

#3460: Can't use superclass when type coercions are involved
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    Reporter:  ryani                    |        Owner:  chak            
        Type:  bug                      |       Status:  new             
    Priority:  normal                   |    Milestone:  6.12 branch     
   Component:  Compiler (Type checker)  |      Version:  6.10.4          
    Severity:  normal                   |   Resolution:                  
    Keywords:                           |   Difficulty:  Unknown         
    Testcase:                           |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple         |  
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Changes (by igloo):

  * milestone:  => 6.12 branch

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3460#comment:2>
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