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(;module: lux)
(sig: #export (Functor f)
(: (All [a b]
(-> (-> a b) (f a) (f b)))
map))
(type: #export (Fix f)
(f (Fix f)))
(type: #export (<&> f g)
(All [a] (& (f a) (g a))))
(type: #export (<|> f g)
(All [a] (| (f a) (g a))))
(type: #export (<.> f g)
(All [a] (f (g a))))
(struct: #export (compF Functor<F> Functor<G>)
{#;doc "Functor composition."}
(All [F G] (-> (Functor F) (Functor G) (Functor (All [a] (F (G a))))))
(def: (map f fga)
(:: Functor<F> map (:: Functor<G> map f) fga)))
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