Odoc_extensionRepresentation and manipulation of type extensions.
and t_extension_constructor = {xt_name : Name.t;xt_args : Odoc_type.constructor_args;xt_ret : Types.type_expr option;xt_type_extension : t_type_extension;xt_alias : extension_alias option;mutable xt_loc : Odoc_types.location;mutable xt_text : Odoc_types.info option;}and t_type_extension = {mutable te_info : Odoc_types.info option;te_type_name : Name.t;te_type_parameters : Types.type_expr list;te_private : private_flag;mutable te_constructors : t_extension_constructor list;mutable te_loc : Odoc_types.location;mutable te_code : string option;}val extension_constructors : t_type_extension -> t_extension_constructor list