[GHC] #7556: build/fold causes with ByteString unpack causes huge memory leak

[GHC]

#7556: build/fold causes with ByteString unpack causes huge memory leak
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    Reporter:  glguy              |       Owner:  duncan                 
        Type:  bug                |      Status:  new                    
    Priority:  normal             |   Milestone:  7.8.1                  
   Component:  libraries (other)  |     Version:  7.6.1                  
    Keywords:                     |          Os:  Unknown/Multiple       
Architecture:  Unknown/Multiple   |     Failure:  Runtime performance bug
  Difficulty:  Unknown            |    Testcase:                         
   Blockedby:                     |    Blocking:                         
     Related:                     |  
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Comment(by duncan):

 Crikey that's some old code. It's also totally wrong, as are the
 implementations of `foldl` and `foldr`. Patch in the works.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7556#comment:4>
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