[GHC] #5462: Deriving clause for arbitrary classes

[GHC]

#5462: Deriving clause for arbitrary classes
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    Reporter:  simonpj           |        Owner:              
        Type:  feature request   |       Status:  new         
    Priority:  normal            |    Milestone:              
   Component:  Compiler          |      Version:  7.2.1       
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by dterei):

 Oh and as part of the change it would be good to add support to Haddock to
 produce docs that tell you if a Class can be derived or not. Could also
 add a command to ghci.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5462#comment:11>
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