[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:                  
        Type:  task                        |      Status:  new             
    Priority:  normal                      |   Milestone:  7.6.1           
   Component:  libraries/base              |     Version:  6.8             
    Keywords:  fusion                      |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple            |     Failure:  None/Unknown    
  Difficulty:  Project (more than a week)  |    Testcase:  N/A             
   Blockedby:                              |    Blocking:                  
     Related:                              |  
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/915#comment:40>
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