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(;module:
lux
(lux (data [product])
(type opaque)))
(opaque: #export (Tainted a)
a
(def: #export taint
(All [a] (-> a (Tainted a)))
(|>. @opaque))
(def: #export trust
(All [a] (-> (Tainted a) a))
(|>. @repr)))
(def: #export (validate pred tainted)
(All [a] (-> (-> a Bool) (Tainted a) (Maybe a)))
(let [value (trust tainted)]
(if (pred value)
(#;Some value)
#;None)))
(def: #export (sanitize f tainted)
(All [a] (-> (-> a a) (Tainted a) a))
(|> tainted trust f))
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