`sig val check_deprecated : Location.t -> Parsetree.attributes -> string -> unit val deprecated_of_attrs : Parsetree.attributes -> string option val deprecated_of_sig : Parsetree.signature -> string option val deprecated_of_str : Parsetree.structure -> string option val check_deprecated_mutable : Location.t -> Parsetree.attributes -> string -> unit val error_of_extension : Parsetree.extension -> Location.error val warning_enter_scope : unit -> unit val warning_leave_scope : unit -> unit val warning_attribute : Parsetree.attributes -> unit val with_warning_attribute : Parsetree.attributes -> (unit -> 'a) -> 'a val emit_external_warnings : Ast_iterator.iterator val warn_on_literal_pattern : Parsetree.attributes -> bool val explicit_arity : Parsetree.attributes -> bool end`