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| data Two a b = | |
| Two a | |
| b | |
| deriving (Eq, Show) | |
| instance (Semigroup a, Semigroup b) => | |
| Semigroup (Two a b) where | |
| (Two x1 y1) <> (Two x2 y2) = Two (x1 M.<> x2) (y1 M.<> y2) | |
| instance (Monoid a, Semigroup a, Monoid b, Semigroup b) => | |
| Monoid (Two a b) where | |
| mempty = Two mempty mempty | |
| mappend = (S.<>) |
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