[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 Herbert Valerio Riedel <hvr@…>):

 In [changeset:"319703ee0c97c593be514222fdee06555816cda4/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="319703ee0c97c593be514222fdee06555816cda4"
 Don't re-export `Alternative(..)` from Control.Monad (re #9586)

 This was done in d94de87252d0fe2ae97341d186b03a2fbe136b04 to avoid orphans
 but since a94dc4c3067c6a0925e2e39f35ef0930771535f1 moved `Alternative`
 into GHC.Base, this isn't needed anymore.

 This is important, as otherwise this would require a non-neglectable
 amount
 of `Control.Monad hiding ((<|>), empty)` imports in user code.

 The Haddock submodule is updated as well

 Test Plan: partial local ./validate --fast, let Harbormaster doublecheck
 it

 Reviewed By: ekmett, austin

 Differential Revision: https://phabricator.haskell.org/D248
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9586#comment:23>
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