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(.module:
[library
[lux (#- and)]])
(interface: .public (Monoid a)
(: a
identity)
(: (-> a a a)
composite))
(def: .public (and left right)
(All [l r] (-> (Monoid l) (Monoid r) (Monoid [l r])))
(implementation
(def: identity
[(\ left identity) (\ right identity)])
(def: (composite [lL rL] [lR rR])
[(\ left composite lL lR)
(\ right composite rL rR)])))
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