Ast.mapmethod position : < arg_label : arg_label -> arg_label
                    ; attribute : attribute -> attribute
                    ; attributes : attributes -> attributes
                    ; binding_op : binding_op -> binding_op
                    ; bool : bool -> bool
                    ; case : case -> case
                    ; cases : cases -> cases
                    ; char : char -> char
                    ; class_declaration : 
                      class_declaration ->
                      class_declaration
                    ; class_description : 
                      class_description ->
                      class_description
                    ; class_expr : class_expr -> class_expr
                    ; class_expr_desc : class_expr_desc -> class_expr_desc
                    ; class_field : class_field -> class_field
                    ; class_field_desc : class_field_desc -> class_field_desc
                    ; class_field_kind : class_field_kind -> class_field_kind
                    ; class_infos : 
                      'a. ( 'a -> 'a ) ->
                      'a class_infos ->
                      'a class_infos
                    ; class_signature : class_signature -> class_signature
                    ; class_structure : class_structure -> class_structure
                    ; class_type : class_type -> class_type
                    ; class_type_declaration : 
                      class_type_declaration ->
                      class_type_declaration
                    ; class_type_desc : class_type_desc -> class_type_desc
                    ; class_type_field : class_type_field -> class_type_field
                    ; class_type_field_desc : 
                      class_type_field_desc ->
                      class_type_field_desc
                    ; closed_flag : closed_flag -> closed_flag
                    ; constant : constant -> constant
                    ; constructor_arguments : 
                      constructor_arguments ->
                      constructor_arguments
                    ; constructor_declaration : 
                      constructor_declaration ->
                      constructor_declaration
                    ; core_type : core_type -> core_type
                    ; core_type_desc : core_type_desc -> core_type_desc
                    ; direction_flag : direction_flag -> direction_flag
                    ; directive_argument : 
                      directive_argument ->
                      directive_argument
                    ; directive_argument_desc : 
                      directive_argument_desc ->
                      directive_argument_desc
                    ; expression : expression -> expression
                    ; expression_desc : expression_desc -> expression_desc
                    ; extension : extension -> extension
                    ; extension_constructor : 
                      extension_constructor ->
                      extension_constructor
                    ; extension_constructor_kind : 
                      extension_constructor_kind ->
                      extension_constructor_kind
                    ; functor_parameter : 
                      functor_parameter ->
                      functor_parameter
                    ; include_declaration : 
                      include_declaration ->
                      include_declaration
                    ; include_description : 
                      include_description ->
                      include_description
                    ; include_infos : 
                      'a. ( 'a -> 'a ) ->
                      'a include_infos ->
                      'a include_infos
                    ; injectivity : injectivity -> injectivity
                    ; int : int -> int
                    ; label : label -> label
                    ; label_declaration : 
                      label_declaration ->
                      label_declaration
                    ; letop : letop -> letop
                    ; list : 'a. ( 'a -> 'a ) -> 'a list -> 'a list
                    ; loc : 'a. ( 'a -> 'a ) -> 'a loc -> 'a loc
                    ; location : location -> location
                    ; location_stack : location_stack -> location_stack
                    ; longident : longident -> longident
                    ; longident_loc : longident_loc -> longident_loc
                    ; module_binding : module_binding -> module_binding
                    ; module_declaration : 
                      module_declaration ->
                      module_declaration
                    ; module_expr : module_expr -> module_expr
                    ; module_expr_desc : module_expr_desc -> module_expr_desc
                    ; module_substitution : 
                      module_substitution ->
                      module_substitution
                    ; module_type : module_type -> module_type
                    ; module_type_declaration : 
                      module_type_declaration ->
                      module_type_declaration
                    ; module_type_desc : module_type_desc -> module_type_desc
                    ; mutable_flag : mutable_flag -> mutable_flag
                    ; object_field : object_field -> object_field
                    ; object_field_desc : 
                      object_field_desc ->
                      object_field_desc
                    ; open_declaration : open_declaration -> open_declaration
                    ; open_description : open_description -> open_description
                    ; open_infos : 
                      'a. ( 'a -> 'a ) ->
                      'a open_infos ->
                      'a open_infos
                    ; option : 'a. ( 'a -> 'a ) -> 'a option -> 'a option
                    ; override_flag : override_flag -> override_flag
                    ; package_type : package_type -> package_type
                    ; pattern : pattern -> pattern
                    ; pattern_desc : pattern_desc -> pattern_desc
                    ; payload : payload -> payload
                    ; position : position -> position
                    ; private_flag : private_flag -> private_flag
                    ; rec_flag : rec_flag -> rec_flag
                    ; row_field : row_field -> row_field
                    ; row_field_desc : row_field_desc -> row_field_desc
                    ; signature : signature -> signature
                    ; signature_item : signature_item -> signature_item
                    ; signature_item_desc : 
                      signature_item_desc ->
                      signature_item_desc
                    ; string : string -> string
                    ; structure : structure -> structure
                    ; structure_item : structure_item -> structure_item
                    ; structure_item_desc : 
                      structure_item_desc ->
                      structure_item_desc
                    ; toplevel_directive : 
                      toplevel_directive ->
                      toplevel_directive
                    ; toplevel_phrase : toplevel_phrase -> toplevel_phrase
                    ; type_declaration : type_declaration -> type_declaration
                    ; type_exception : type_exception -> type_exception
                    ; type_extension : type_extension -> type_extension
                    ; type_kind : type_kind -> type_kind
                    ; value_binding : value_binding -> value_binding
                    ; value_description : 
                      value_description ->
                      value_description
                    ; variance : variance -> variance
                    ; virtual_flag : virtual_flag -> virtual_flag
                    ; with_constraint : with_constraint -> with_constraint.. > ->
  position ->
  positionmethod location_stack : 'b -> location_stack -> location_stackmethod longident_loc : 'b -> longident_loc -> longident_locmethod direction_flag : 'b -> direction_flag -> direction_flagmethod private_flag : 'b -> private_flag -> private_flagmethod mutable_flag : 'b -> mutable_flag -> mutable_flagmethod virtual_flag : 'b -> virtual_flag -> virtual_flagmethod override_flag : 'b -> override_flag -> override_flagmethod closed_flag : 'b -> closed_flag -> closed_flagmethod injectivity : 'b -> injectivity -> injectivitymethod attributes : 'b -> attributes -> attributesmethod core_type_desc : 'b -> core_type_desc -> core_type_descmethod package_type : 'b -> package_type -> package_typemethod row_field_desc : 'b -> row_field_desc -> row_field_descmethod object_field : 'b -> object_field -> object_fieldmethod object_field_desc : 'b -> object_field_desc -> object_field_descmethod pattern_desc : 'b -> pattern_desc -> pattern_descmethod expression : 'b -> expression -> expressionmethod expression_desc : 'b -> expression_desc -> expression_descmethod binding_op : 'b -> binding_op -> binding_opmethod value_description : 'b -> value_description -> value_descriptionmethod type_declaration : 'b -> type_declaration -> type_declarationmethod label_declaration : 'b -> label_declaration -> label_declarationmethod constructor_declaration : 'b ->
  constructor_declaration ->
  constructor_declarationmethod constructor_arguments : 'b ->
  constructor_arguments ->
  constructor_argumentsmethod type_extension : 'b -> type_extension -> type_extensionmethod extension_constructor : 'b ->
  extension_constructor ->
  extension_constructormethod type_exception : 'b -> type_exception -> type_exceptionmethod extension_constructor_kind : 'b ->
  extension_constructor_kind ->
  extension_constructor_kindmethod class_type : 'b -> class_type -> class_typemethod class_type_desc : 'b -> class_type_desc -> class_type_descmethod class_signature : 'b -> class_signature -> class_signaturemethod class_type_field : 'b -> class_type_field -> class_type_fieldmethod class_type_field_desc : 'b ->
  class_type_field_desc ->
  class_type_field_descmethod class_infos : 'b -> 'a. ( 'a -> 'a ) -> 'a class_infos -> 'a class_infosmethod class_description : 'b -> class_description -> class_descriptionmethod class_type_declaration : 'b ->
  class_type_declaration ->
  class_type_declarationmethod class_expr : 'b -> class_expr -> class_exprmethod class_expr_desc : 'b -> class_expr_desc -> class_expr_descmethod class_structure : 'b -> class_structure -> class_structuremethod class_field : 'b -> class_field -> class_fieldmethod class_field_desc : 'b -> class_field_desc -> class_field_descmethod class_field_kind : 'b -> class_field_kind -> class_field_kindmethod class_declaration : 'b -> class_declaration -> class_declarationmethod module_type : 'b -> module_type -> module_typemethod module_type_desc : 'b -> module_type_desc -> module_type_descmethod functor_parameter : 'b -> functor_parameter -> functor_parametermethod signature_item : 'b -> signature_item -> signature_itemmethod signature_item_desc : 'b -> signature_item_desc -> signature_item_descmethod module_declaration : 'b -> module_declaration -> module_declarationmethod module_substitution : 'b -> module_substitution -> module_substitutionmethod module_type_declaration : 'b ->
  module_type_declaration ->
  module_type_declarationmethod open_infos : 'b -> 'a. ( 'a -> 'a ) -> 'a open_infos -> 'a open_infosmethod open_description : 'b -> open_description -> open_descriptionmethod open_declaration : 'b -> open_declaration -> open_declarationmethod include_infos : 'b ->
  'a. ( 'a -> 'a ) ->
  'a include_infos ->
  'a include_infosmethod include_description : 'b -> include_description -> include_descriptionmethod include_declaration : 'b -> include_declaration -> include_declarationmethod with_constraint : 'b -> with_constraint -> with_constraintmethod module_expr : 'b -> module_expr -> module_exprmethod module_expr_desc : 'b -> module_expr_desc -> module_expr_descmethod structure_item : 'b -> structure_item -> structure_itemmethod structure_item_desc : 'b -> structure_item_desc -> structure_item_descmethod value_binding : 'b -> value_binding -> value_bindingmethod module_binding : 'b -> module_binding -> module_bindingmethod toplevel_phrase : 'b -> toplevel_phrase -> toplevel_phrasemethod toplevel_directive : 'b -> toplevel_directive -> toplevel_directivemethod directive_argument : 'b -> directive_argument -> directive_argumentmethod directive_argument_desc : 'b ->
  directive_argument_desc ->
  directive_argument_desc