[GHC] #7205: Re-introduce left/right coercion decomposition

[GHC]

#7205: Re-introduce left/right coercion decomposition
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  Reporter:  simonpj           |          Owner:                  
      Type:  feature request   |         Status:  closed          
  Priority:  normal            |      Milestone:                  
 Component:  Compiler          |        Version:  7.4.2           
Resolution:  fixed             |       Keywords:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown      |     Difficulty:  Unknown         
  Testcase:  gadt/T7205        |      Blockedby:                  
  Blocking:                    |        Related:                  
-------------------------------+--------------------------------------------

Comment(by morabbin):

 That should #6018; apologies.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7205#comment:7>
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