[GHC] #9343: foldl' is not a good consumer

[GHC]

#9343: foldl' is not a good consumer
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        Reporter:  dfeuer            |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  libraries/base    |                 Version:  7.8.3
        Keywords:                    |  Differential Revisions:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |              Difficulty:  Unknown
       Test Case:                    |              Blocked By:
        Blocking:                    |         Related Tickets:
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 Some fancy footwork went into making length a good consumer. Since `length
 = foldl' (\n _ -> n + 1) 0`, I was wondering if a trick similar to the one
 used for length might work for more general strict left folds.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9343>
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