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(.module:
[library
[lux #*]]
[// (#+ CoMonad)
[//
[functor (#+ Functor)]]])
(type: #export (CoFree F a)
{#.doc (doc "The CoFree CoMonad.")}
[a (F (CoFree F a))])
(implementation: #export (functor dsl)
(All [F] (-> (Functor F) (Functor (CoFree F))))
(def: (map f [head tail])
[(f head) (\ dsl map (map f) tail)]))
(implementation: #export (comonad dsl)
(All [F] (-> (Functor F) (CoMonad (CoFree F))))
(def: &functor (..functor dsl))
(def: (out [head tail])
head)
(def: (split [head tail])
[[head tail]
(\ dsl map split tail)]))
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