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

[GHC]

#915: Implement list fusion using streams instead of foldr/build
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 Reporter:  simonpj         |          Owner:  simonpj           
     Type:  task            |         Status:  new               
 Priority:  normal          |      Milestone:  6.8               
Component:  libraries/base  |        Version:  6.6               
 Severity:  normal          |     Resolution:                    
 Keywords:  fusion          |     Difficulty:  Project (> 1 week)
 Testcase:  N/A             |   Architecture:  Multiple          
       Os:  Unknown         |  
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/915>
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