Parameter `Defaults'.J`

type a

val write : Buffer.t -> a -> unit

val read : Deriving_Json_lexer.lexbuf -> a

val match_variant : [ `Cst of int | `NCst of int ] -> bool

val read_variant : 
  Deriving_Json_lexer.lexbuf ->
  [ `Cst of int | `NCst of int ] ->
  a

Parameter Defaults'.J