[GHC] #10751: Implement Phase 1 of MonadFail Proposal (MFP)

[GHC]

#10751: Implement Phase 1 of MonadFail Proposal (MFP)
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        Reporter:  hvr               |                Owner:  quchen
            Type:  task              |               Status:  closed
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.2
      Resolution:  fixed             |             Keywords:  report-impact
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1248
       Wiki Page:                    |
  prime:Libraries/Proposals/MonadFail|
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Comment (by Herbert Valerio Riedel <hvr@…>):

 In [changeset:"d25f8535a0178984f29178f983536ab40cc471a8/ghc"
 d25f8535/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="d25f8535a0178984f29178f983536ab40cc471a8"
 Update transformers submodule

 Most notably this pulls in `MonadFail` instances
 (see also #10751)

 - add MonadFail instance for ContT
 - re-order methods for consistency
 - Add `MonadFail` instances
 - Canonicalise Monad instances
 - instance Bifunctor Constant
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10751#comment:22>
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