[GHC] #915: Implement list fusion using streams instead of foldr/build

#915: Implement list fusion using streams instead of foldr/build
-------------------------------+--------------------------------------------
    Reporter:  simonpj         |        Owner:         
        Type:  task            |       Status:  new    
    Priority:  normal          |    Milestone:  6.8    
   Component:  libraries/base  |      Version:  6.4.2  
    Severity:  normal          |     Keywords:         
          Os:  Unknown         |   Difficulty:  Unknown
Architecture:  Unknown         |  
-------------------------------+--------------------------------------------
We'd like to try using the stream-fusion idea of Don Stewart, Duncan
 Coutts and Roman Leshchinskiy, and replace the (somewhat fragile)
 foldr/build stuff.

 See #876.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/915>
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