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(.module:
[library
[lux "*"]]
[//
[functor
["." contravariant]]])
(type: .public (Equivalence a)
(Interface
(: (-> a a Bit)
=)))
(def: .public (rec sub)
(All (_ a)
(-> (-> (Equivalence a) (Equivalence a)) (Equivalence a)))
(implementation
(def: (= left right)
(sub = left right))))
(implementation: .public functor
(contravariant.Functor Equivalence)
(def: (each f equivalence)
(implementation
(def: (= reference sample)
(\ equivalence = (f reference) (f sample))))))
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