[GHC] #8026: DatatypeContexts should be fixed, not deprecated

[GHC]

#8026: DatatypeContexts should be fixed, not deprecated
-------------------------------+--------------------------------------------
  Reporter:  gidyn             |          Owner:                  
      Type:  feature request   |         Status:  new             
  Priority:  normal            |      Milestone:                  
 Component:  Compiler          |        Version:  7.6.3           
Resolution:                    |       Keywords:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown      |     Difficulty:  Unknown         
  Testcase:                    |      Blockedby:                  
  Blocking:                    |        Related:                  
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Comment(by gidyn):

 This might be a better example:
 {{{
 data Eq a => Pair a = Pair {x::a, y::a}

 equal :: Pair a -> Bool
 equal pair = (x pair) == (y pair)
 }}}
 Is there any way you can avoid a redundant {{{Eq a =>}}} in the definition
 of {{{equal}}}, without adding a redundant pattern match?

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/8026#comment:3>
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