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(.module:
[library
[lux #*
["." meta]
[abstract
[monad (#+ do)]]
[control
["." try (#+ Try)]
["." exception (#+ exception:)]
[parser
["<.>" code]]]
[macro
[syntax (#+ syntax:)]
["." code]]
[math
[number
["i" int]]]
[type
abstract]]])
(exception: .public zero_cannot_be_a_modulus)
(abstract: .public (Modulus %)
{}
Int
(def: .public (modulus value)
(Ex (_ %) (-> Int (Try (Modulus %))))
(if (i.= +0 value)
(exception.except ..zero_cannot_be_a_modulus [])
(#try.Success (:abstraction value))))
(def: .public divisor
(All (_ %) (-> (Modulus %) Int))
(|>> :representation))
(def: .public (= reference subject)
(All (_ %r %s) (-> (Modulus %r) (Modulus %s) Bit))
(i.= (:representation reference)
(:representation subject)))
(def: .public (congruent? modulus reference subject)
(All (_ %) (-> (Modulus %) Int Int Bit))
(|> subject
(i.- reference)
(i.% (:representation modulus))
(i.= +0)))
)
(syntax: .public (literal [divisor <code>.int])
(meta.lifted
(do try.monad
[_ (..modulus divisor)]
(in (list (` ((~! try.trusted) (..modulus (~ (code.int divisor))))))))))
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