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

[GHC]

#915: Implement list fusion using streams instead of foldr/build
----------------------------+-----------------------------------------------
 Reporter:  simonpj         |          Owner:                    
     Type:  task            |         Status:  new               
 Priority:  normal          |      Milestone:  6.12 branch       
Component:  libraries/base  |        Version:  6.8               
 Severity:  normal          |     Resolution:                    
 Keywords:  fusion          |     Difficulty:  Project (> 1 week)
 Testcase:  N/A             |   Architecture:  Multiple          
       Os:  Unknown         |  
----------------------------+-----------------------------------------------
Changes (by igloo):

  * milestone:  6.10 branch => 6.12 branch

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/915#comment:11>
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