[GHC] #10963: Beginner-targeted language extension

[GHC]

#10963: Beginner-targeted language extension
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        Reporter:  kanetw            |                Owner:
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2136
       Wiki Page:                    |
  [wiki:Design/GHCi/Type]            |
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Comment (by Iceland_jack):

 Replying to [comment:7 takenobu]:
 > Hi,
 >
 > Is Alexander Kjeldaas's representation idea useful? [1]
 >
 > [1] https://mail.haskell.org/pipermail/ghc-
 devs/2016-February/011398.html
 >
 >
 > {{{
 > Prelude> :t foldr
 > foldr :: Foldable t => (a -> b -> b) -> b -> t a -> b
 > For example:
 > foldr :: (a -> b -> b) -> b -> [a] -> b
 > foldr :: (a -> b -> b) -> b -> Maybe a -> b
 > foldr :: (a -> b -> b) -> b -> Identity a -> b
 > foldr :: (a -> b -> b) -> b -> (c, a) -> b
 > and more
 > }}}

 See #11439

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10963#comment:16>
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