trait MonoidLaw extends SemigroupLaw
Monoid instances must satisfy scalaz.Semigroup.SemigroupLaw and 2 additional laws:
- left identity:
forall a. append(zero, a) == a
- right identity :
forall a. append(a, zero) == a
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unfoldlSumOptConsistency[S](s: S, f: (S) ⇒ Maybe[(S, F)])(implicit E: Equal[F]): Boolean
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