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(.module:
  [library
   [lux {"-" Type static public private}
    [abstract
     [equivalence {"+" Equivalence}]
     ["[0]" monad {"+" do}]]
    [data
     ["[0]" product]
     [format
      ["[0]F" binary {"+" Writer} ("[1]#[0]" monoid)]]
     [collection
      ["[0]" row {"+" Row}]]]]]
  ["[0]" // "_"
   ["[0]" modifier {"+" Modifier modifiers:}]
   ["[1][0]" constant {"+" UTF8}
    ["[1]/[0]" pool {"+" Pool Resource}]]
   ["[1][0]" index {"+" Index}]
   ["[1][0]" attribute {"+" Attribute}]
   ["[1][0]" type {"+" Type}
    [category {"+" Value}]
    [descriptor {"+" Descriptor}]]])

(type: .public Field
  (Rec Field
    (Record
     [#modifier (Modifier Field)
      #name (Index UTF8)
      #descriptor (Index (Descriptor Value))
      #attributes (Row Attribute)])))

(modifiers: Field
  ["0001" public]
  ["0002" private]
  ["0004" protected]
  ["0008" static]
  ["0010" final]
  ["0040" volatile]
  ["0080" transient]
  ["1000" synthetic]
  ["4000" enum]
  )

(def: .public equivalence
  (Equivalence Field)
  ($_ product.equivalence
      modifier.equivalence
      //index.equivalence
      //index.equivalence
      (row.equivalence //attribute.equivalence)))

(def: .public (writer field)
  (Writer Field)
  (`` ($_ binaryF#composite
          (~~ (template [<writer> <slot>]
                [(<writer> (value@ <slot> field))]

                [modifier.writer #modifier]
                [//index.writer #name]
                [//index.writer #descriptor]
                [(binaryF.row/16 //attribute.writer) #attributes]))
          )))

(def: .public (field modifier name type attributes)
  (-> (Modifier Field) UTF8 (Type Value) (Row Attribute)
      (Resource Field))
  (do //constant/pool.monad
    [@name (//constant/pool.utf8 name)
     @descriptor (//constant/pool.descriptor (//type.descriptor type))]
    (in [#modifier modifier
         #name @name
         #descriptor @descriptor
         #attributes attributes])))