[GHC] #10365: Implement Semigroup as a superclass of Monoid Proposal (Phase 1)

[GHC]

#10365: Implement Semigroup as a superclass of Monoid Proposal (Phase 1)
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        Reporter:  gidyn             |                Owner:  quchen
            Type:  feature request   |               Status:  patch
        Priority:  high              |            Milestone:  8.0.1
       Component:  libraries/base    |              Version:  7.10.1
      Resolution:                    |             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:D1284
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Comment (by hvr):

 Replying to [comment:22 RyanGlScott]:
 > Bear in mind that it's already possible for literals to crash at
 runtime:
 > {{{
 > λ> -1 :: Natural
 > *** Exception: arithmetic underflow
 > }}}

 Somewhat related, #10930 wants GHC to at least emit a compiler warning in
 that case

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10365#comment:23>
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