This Semigroup instance breaks the semigroup laws, since
λ> mempty <> mojito Cocktail {name = " Mojito", ingredients = ["rum","mint"]} λ> mojito <> mempty Cocktail {name = "Mojito ", ingredients = ["rum","mint"]}
If you want to fix this, consider making this a commutative monoid:
λ> (mojito <> robroy) == (robroy <> mojito) ...
...although I think sufficiently advanced drinks are not commutative because of chemistry.
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This Semigroup instance breaks the semigroup laws, since
If you want to fix this, consider making this a commutative monoid:
...although I think sufficiently advanced drinks are not commutative because of chemistry.