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|
(.using
[library
[lux (.except)]]
[//
["[0]" equivalence (.only Equivalence)]
[functor
["[0]" contravariant]]])
(type: .public (Hash a)
(Interface
(is (Equivalence a)
equivalence)
(is (-> a Nat)
hash)))
(def .public functor
(contravariant.Functor Hash)
(implementation
(def (each f super)
(implementation
(def equivalence
(at equivalence.functor each f
(at super equivalence)))
(def hash
(|>> f (at super hash)))))))
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