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(.module:
[library
[lux "*"]]
[//
["[0]" equivalence {"+" Equivalence}]
[functor
["[0]" contravariant]]])
(type: .public (Hash a)
(Interface
(: (Equivalence a)
&equivalence)
(: (-> a Nat)
hash)))
(implementation: .public functor
(contravariant.Functor Hash)
(def: (each f super)
(implementation
(def: &equivalence
(# equivalence.functor each f
(# super &equivalence)))
(def: hash
(|>> f (# super hash))))))
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