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

[GHC]

#9586: Implement Traversable/Foldable-Burning-Bridges Proposal
-------------------------------------+-------------------------------------
              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   |
-------------------------------------+-------------------------------------

Comment (by dfeuer):

 Replying to [comment:27 rwbarton]:
 > Off-topic for this ticket but why not also generalize `filterM`,
 `forever`, ..., `replicateM_`? Are there hangups about the letter M in the
 names of some of these functions?

 `filterM` cannot be generalized to `Traversable` in any sensible way—it
 needs something stronger. `forever` and `replicateM_` should be easy.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9586#comment:28>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler