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

(type: .public Exception
  {#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
      ))