[vector] #15: Add "generalised scan"

[vector]

#15: Add "generalised scan"
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Reporter:  rl           |        Owner:     
    Type:  enhancement  |       Status:  new
Priority:  critical     |    Milestone:  0.8
 Version:  0.7          |   Resolution:     
Keywords:               |  
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Comment (by rl):

 I would be very interested to see the cases where vector is slower!
 Perhaps I can fix it :-)

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Ticket URL: <http://trac.haskell.org/vector/ticket/15#comment:10>
vector <http://trac.haskell.org/vector>
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