Implement Semigroup as a superclass of Monoid Proposal (Phase 1)
More details in prime:Libraries/Proposals/SemigroupMonoid
Phase 1 (GHC 7.12)
Phase 1 consists in (at the very least) moving
base for GHC 7.12 (aka 8.0).
If there's enough time we will also implement a warning as part of the first phase:
Add a warning about definitions of an operator named
(<>)that indicate it will be coming into Prelude in 7.14. We should warn about missing Semigroup instances at any use site of
(<>)as they'll break in 7.14.
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