[GHC] #12868: Add groupOn function to Data.List

[GHC]

#12868: Add groupOn function to Data.List
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        Reporter:  wizzup            |                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):

 Worth considering. You should raise the issue on the `libraries` list,
 following the process outlined on
 https://wiki.haskell.org/Library_submissions

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12868#comment:2>
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