[GHC] #4370: Bring back monad comprehensions

[GHC]

#4370: Bring back monad comprehensions
---------------------------------+------------------------------------------
    Reporter:  simonpj           |        Owner:  nsch        
        Type:  feature request   |       Status:  patch       
    Priority:  normal            |    Milestone:  7.4.1       
   Component:  Compiler          |      Version:  6.12.3      
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
---------------------------------+------------------------------------------

Comment(by simonpj):

 Oh, apologies; I should have mentioned that I rolled up my sleeves three
 days ago and did the migration myself. I'm deep in hacking mode now.

 Simon

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4370#comment:52>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler