val sexp_of_t : t -> Sexplib0.Sexp.tval user_exn : t -> exnException raised by the user function
val sub_sexp : t -> Sexplib0.Sexp.tS-expression that failed to be converted
val location : t -> Positions.range optionPosition of sub_sexp t in the original source, if found
val report : Stdlib.Format.formatter -> filename:string -> t -> unitSimilar to Parse_error.report