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(.module:
  [library
   [lux "*"
    [abstract
     [equivalence {"+" [Equivalence]}]]
    [data
     ["[0]" product]
     ["[0]" format "_"
      ["[1]" binary {"+" [Writer]}]]]
    [math
     [number
      ["n" nat]]]]]
  ["[0]" // "_"
   ["//[1]" /// "_"
    [constant {"+" [Class]}]
    ["[1][0]" index {"+" [Index]}]
    [bytecode
     ["[1][0]" address {"+" [Address]}]]
    [encoding
     ["[1][0]" unsigned {"+" [U2]}]]]])

(type: .public Exception
  (Record
   [#start Address
    #end Address
    #handler Address
    #catch (Index Class)]))

(def: .public equivalence
  (Equivalence Exception)
  ($_ product.equivalence
      ////address.equivalence
      ////address.equivalence
      ////address.equivalence
      ////index.equivalence
      ))

... https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.3
(def: .public length
  Nat
  ($_ n.+
      ... u2 start_pc;
      ////unsigned.bytes/2
      ... u2 end_pc;
      ////unsigned.bytes/2
      ... u2 handler_pc;
      ////unsigned.bytes/2
      ... u2 catch_type;
      ////unsigned.bytes/2
      ))

(def: .public writer
  (Writer Exception)
  ($_ format.and
      ////address.writer
      ////address.writer
      ////address.writer
      ////index.writer
      ))