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(.module:
[library
[lux {"-" local}
[abstract
[equivalence {"+" Equivalence}]
[hash {"+" Hash}]]
[control
[pipe {"+" case>}]]
[data
["[0]" name]
[text
["%" format {"+" Format}]]]
[math
[number
["n" nat]]]]]
["[0]" / "_"
["[1][0]" variable {"+" Variable}]])
(type: .public Constant
Name)
(type: .public Reference
(Variant
{#Variable Variable}
{#Constant Constant}))
(implementation: .public equivalence
(Equivalence Reference)
(def: (= reference sample)
(case [reference sample]
(^template [<tag> <equivalence>]
[[{<tag> reference} {<tag> sample}]
(# <equivalence> = reference sample)])
([#Variable /variable.equivalence]
[#Constant name.equivalence])
_
false)))
(implementation: .public hash
(Hash Reference)
(def: &equivalence
..equivalence)
(def: (hash value)
(case value
(^template [<factor> <tag> <hash>]
[{<tag> value}
(|> value
(# <hash> hash)
(n.* <factor>))])
([2 #Variable /variable.hash]
[3 #Constant name.hash])
)))
(template [<name> <family> <tag>]
[(template: .public (<name> content)
[(<| {<family>}
{<tag>}
content)])]
[local ..#Variable /variable.#Local]
[foreign ..#Variable /variable.#Foreign]
)
(template [<name> <tag>]
[(template: .public (<name> content)
[(<| {<tag>}
content)])]
[variable ..#Variable]
[constant ..#Constant]
)
(def: .public self
Reference
(..local 0))
(def: .public format
(Format Reference)
(|>> (case> {#Variable variable}
(/variable.format variable)
{#Constant constant}
(%.name constant))))
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