[GHC] #4526: Make Chan an instance of Eq

[GHC]

#4526: Make Chan an instance of Eq
---------------------------------+------------------------------------------
    Reporter:  mitar             |       Owner:                
        Type:  feature request   |      Status:  new           
    Priority:  normal            |   Component:  libraries/base
     Version:  7.0.1             |    Keywords:                
    Testcase:                    |   Blockedby:                
          Os:  Unknown/Multiple  |    Blocking:                
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown  
---------------------------------+------------------------------------------
 Chan is not an instance of Eq, but it could be easily, as MVars it uses
 are.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4526>
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