[GHC] #7994: Make foldl into a good consumer

[GHC]

#7994: Make foldl into a good consumer
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        Reporter:  simonpj           |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by nomeata):

 > The demand analyser currently analyses the function before the body. One
 could do a second round, but there is a risk of exponential blow-up.

 In this case, the let is a recursive let anyways, so we are going to do
 multiple iterations. Do we really need to avoid re-analysis so hard?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7994#comment:4>
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