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(.module:
[library
[lux {"-" [type]}
[abstract
[equivalence {"+" [Equivalence]}]]
[control
[parser
["<.>" code]]]
[macro {"+" [with_identifiers]}
[syntax {"+" [syntax:]}]]
["." type
abstract]]])
(abstract: .public (Class t c %)
{}
(-> t c)
(def: .public class
(All (_ t c)
(Ex (_ %)
(-> (-> t c) (Class t c %))))
(|>> :abstraction))
(abstract: .public (Quotient t c %)
{}
(Record
[#value t
#label c])
(def: .public (quotient class value)
(All (_ t c %)
(-> (Class t c %) t
(Quotient t c %)))
(:abstraction [#value value
#label ((:representation Class class) value)]))
(template [<name> <output> <slot>]
[(def: .public <name>
(All (_ t c %) (-> (Quotient t c %) <output>))
(|>> :representation (value@ <slot>)))]
[value t #value]
[label c #label]
)
)
)
(syntax: .public (type [class <code>.any])
(with_identifiers [g!t g!c g!%]
(in (list (` ((~! type.:by_example)
[(~ g!t) (~ g!c) (~ g!%)]
(..Class (~ g!t) (~ g!c) (~ g!%))
(~ class)
(..Quotient (~ g!t) (~ g!c) (~ g!%))))))))
(implementation: .public (equivalence super)
(All (_ t c %) (-> (Equivalence c) (Equivalence (..Quotient t c %))))
(def: (= reference sample)
(\ super = (..label reference) (..label sample))))
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