[GHC] #4148: improve new recursive do syntax

[GHC]

#4148: improve new recursive do syntax
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    Reporter:  guest             |       Owner:                  
        Type:  feature request   |      Status:  new             
    Priority:  low               |   Milestone:  7.6.1           
   Component:  Compiler          |     Version:  6.12.3          
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Comment(by simonmar):

 Must we really have two versions of the same extension?  This seems
 unnecessarily complex to me.  Can't we just decide which one is the best
 and keep it?  I thought `do rec` was supposed to make things simpler?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4148#comment:15>
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