[GHC] #9586: Implement Traversable/Foldable-Burning-Bridges Proposal

[GHC]

#9586: Implement Traversable/Foldable-Burning-Bridges Proposal
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              Reporter:  hvr         |            Owner:  hvr
                  Type:  task        |           Status:  new
              Priority:  normal      |        Milestone:  7.10.1
             Component:              |          Version:
  libraries/base                     |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Difficult (2-5
  Unknown/Multiple                   |  days)
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:  #9621
             Test Case:              |
              Blocking:              |
Differential Revisions:  Phab:D209   |
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Comment (by rwbarton):

 Replying to [comment:18 Herbert Valerio Riedel <hvr@…>]:
 > In [changeset:"b8f583928fa6cb5371a872fc73080d2002dd87d9/ghc"]:
 > {{{
 > #!CommitTicketReference repository="ghc"
 revision="b8f583928fa6cb5371a872fc73080d2002dd87d9"
 > Export `Monoid(..)`/`Foldable(..)`/`Traversable(..)` from Prelude
 >
 > This finally exposes also the methods of these 3 classes in the Prelude
 > in order to allow to define basic class instances w/o needing imports.
 >
 > This almost completes the primary goal of #9586
 >
 > NOTE: `fold`, `foldl'`, `foldr'`, and `toList` are not exposed yet,
 >       as they require upstream fixes for at least `containers` and
 >       `bytestring`, and are not required for defining basic instances.
 >
 > Reviewed By: ekmett, austin
 >
 > Differential Revision: https://phabricator.haskell.org/D236
 > }}}

 This patch seems to be unrelated to the scope of this ticket.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9586#comment:26>
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