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(.module:
  [library
   [lux (#- Variant)
    ["_" test (#+ Test)]
    ["." debug]
    [abstract
     codec
     [monad (#+ do)]
     ["." equivalence (#+ Equivalence)
      ["poly/#" \\poly]]
     [\\specification
      ["$." equivalence]
      ["$." codec]]]
    [control
     pipe
     ["." try]
     ["p" parser
      ## TODO: Get rid of this import ASAP
      [json (#+)]]]
    [data
     ["." bit]
     ["." maybe]
     ["." text
      ["%" format (#+ format)]]
     [format
      [json (#+)
       [\\poly
        ["." /]]]]
     [collection
      [row (#+ row)]
      ["d" dictionary]
      ["." list]]]
    [macro
     [poly (#+ derived:)]]
    [type
     ["." unit]]
    [math
     ["." random (#+ Random)]
     [number
      ["n" nat]
      ["." frac]]]
    [time
     ["ti" instant]
     ["tda" date]
     ## ["tdu" duration]
     ]]]
  [test
   [lux
    [time
     ["_." instant]
     ## ["_." duration]
     ]]])

(type: Variant
  (#Bit Bit)
  (#Text Text)
  (#Frac Frac))

(type: #rec Recursive
  (#Number Frac)
  (#Addition Frac Recursive))

(type: Record
  {#bit Bit
   #frac Frac
   #text Text
   #maybe (Maybe Frac)
   #list (List Frac)
   #dictionary (d.Dictionary Text Frac)
   #variant Variant
   #tuple [Bit Text Frac]
   #recursive Recursive
   ## #instant ti.Instant
   ## #duration tdu.Duration
   #date tda.Date
   #grams (unit.Qty unit.Gram)})

(def: gen_recursive
  (Random Recursive)
  (random.rec
   (function (_ gen_recursive)
     (random.or random.safe_frac
                (random.and random.safe_frac
                            gen_recursive)))))

(def: qty
  (All [unit] (Random (unit.Qty unit)))
  (\ random.monad map (debug.private unit.in) random.int))

(def: gen_record
  (Random Record)
  (do {! random.monad}
    [size (\ ! map (n.% 2) random.nat)]
    ($_ random.and
        random.bit
        random.safe_frac
        (random.unicode size)
        (random.maybe random.safe_frac)
        (random.list size random.safe_frac)
        (random.dictionary text.hash size (random.unicode size) random.safe_frac)
        ($_ random.or random.bit (random.unicode size) random.safe_frac)
        ($_ random.and random.bit (random.unicode size) random.safe_frac)
        ..gen_recursive
        ## _instant.instant
        ## _duration.duration
        random.date
        ..qty
        )))

(derived: equivalence
  (poly/equivalence.equivalence Record))

(derived: codec
  (/.codec Record))

(def: #export test
  Test
  (<| (_.covering /._)
      (_.for [/.codec]
             ($codec.spec ..equivalence ..codec ..gen_record))))