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(.module:
lux
(lux (control ["F" functor]
comonad)))
(type: #export (Env e a)
{#env e
#value a})
(structure: #export Functor<Env> (All [e] (F.Functor (Env e)))
(def: (map f fa)
(update@ #value f fa)))
(structure: #export CoMonad<Env> (All [e] (CoMonad (Env e)))
(def: functor Functor<Env>)
(def: unwrap (get@ #value))
(def: (split wa)
(set@ #value wa wa)))
(def: #export (local change env)
(All [e a] (-> (-> e e) (Env e a) (Env e a)))
(update@ #env change env))
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