[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:
             Test Case:              |
              Blocking:              |
Differential Revisions:  Phab:D209   |
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Changes (by hvr):

 * differential:   => Phab:D209


Comment:

 The medium-sized patch in Phab:D209 implements the **first phase**, namely
 to re-export solely the two type-classes `Foldable` and `Traversable`
 (sans any methods) from `Prelude`

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9586#comment:1>
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