[GHC] #12160: MonadFail instance for (Either String)?

[GHC]

#12160: MonadFail instance for (Either String)?
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        Reporter:  lexi.lambda       |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  libraries         |              Version:  8.0.1
  (other)                            |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nomeata):

 Sounds like a good idea to me, but there might be issues (such as breaking
 compatibility with the current `Monad` instance for `Either`). I suggest
 you propose this formally, as described in
 https://wiki.haskell.org/Library_submissions, and see what the collective
 wisdom of the community thinks of this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12160#comment:1>
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