[GHC] #11815: Data.List: Add a function to get consecutive elements (mapConsecutives)

[GHC]

#11815: Data.List: Add a function to get consecutive elements (mapConsecutives)
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        Reporter:  holmisen          |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  low               |            Milestone:
       Component:  libraries/base    |              Version:
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nomeata):

 Thanks. With large lists, `-O2` and `zipConsWith`, there is a significant
 difference (15% faster).

 With just `-O`, the difference is smaller (10%), but still there. But the
 libraries are built with `-O2` anyways.

 So I’d be in favor of the explicitly recursive variants.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11815#comment:10>
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