[GHC] #3866: Constr Eq instance should have better documentation or semantics

[GHC]

#3866: Constr Eq instance should have better documentation or semantics
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    Reporter:  batterseapower     |        Owner:  dreixel     
        Type:  bug                |       Status:  assigned    
    Priority:  normal             |    Milestone:  6.12.2      
   Component:  libraries (other)  |      Version:  6.12.1      
    Keywords:  syb                |   Difficulty:              
          Os:  Unknown/Multiple   |     Testcase:              
Architecture:  Unknown/Multiple   |      Failure:  None/Unknown
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Comment(by dreixel):

 I have attached the new patch.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3866#comment:6>
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