[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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Description changed by wizzup:

@@ -1,1 +1,1 @@
- sortOn was already add in #9004 but what about groupOn ?
+ sortOn was already added in #9004 but what about groupOn ?

New description:

 sortOn was already added in #9004 but what about groupOn ?

 According to
 https://wiki.haskell.org/List_function_suggestions#groupOn_and_sortOn both
 functions are "so common".

 Although rejected in #2659, this might be a good time to reconsider.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12868#comment:1>
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