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glguy/vinyl elfield monoid.hs

Last active July 19, 2018 22:54
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vinyl elfield monoid.hs
instance ('(a,b) ~ x, Semigroup b) => Semigroup (ElField x) where
Field x <> Field y = Field (x <> y)
instance ('(a,b) ~ x, KnownSymbol a, Monoid b) => Monoid (ElField x) where
mempty = Field mempty
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