λ ( x : { field0 : Bool , field1 : Optional (Optional Bool) , field2 : Natural , field3 : Integer , field4 : Double , field5 : Text , field6 : List (List Bool) } ) → { field00 = Natural/fold , field01 = Natural/build , field02 = Natural/isZero , field03 = Natural/even , field04 = Natural/odd , field05 = Natural/toInteger , field06 = Natural/show , field07 = Integer/show , field08 = Double/show , field09 = List/build , field10 = List/fold , field11 = List/length , field12 = List/head , field13 = List/last , field14 = List/indexed , field15 = List/reverse , field16 = Optional/fold , field17 = Optional/build , field18 = True , field19 = False }