Syntaxerr

`sig
type error =
Unclosed of Location.t * string * Location.t * string
| Expecting of Location.t * string
| Not_expecting of Location.t * string
| Applicative_path of Location.t
| Variable_in_scope of Location.t * string
| Other of Location.t
| Ill_formed_ast of Location.t * string
| Invalid_package_type of Location.t * string
exception Error of Syntaxerr.error
exception Escape_error
val report_error : Format.formatter -> Syntaxerr.error -> unit
val location_of_error : Syntaxerr.error -> Location.t
val ill_formed_ast : Location.t -> string -> 'a
end`