[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:  patch           
    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 ross):

 I'm not sure what changes to the User's Guide are included in the patch,
 but it might be clean to describe rec (now unsegmented) as sugar for mfix,
 and then segmentation of mdo in terms of rec.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4148#comment:26>
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