`sig val mk : ?loc:Ast_helper.loc -> Parsetree.signature_item_desc -> Parsetree.signature_item val value : ?loc:Ast_helper.loc -> Parsetree.value_description -> Parsetree.signature_item val type_ : ?loc:Ast_helper.loc -> Asttypes.rec_flag -> Parsetree.type_declaration list -> Parsetree.signature_item val type_extension : ?loc:Ast_helper.loc -> Parsetree.type_extension -> Parsetree.signature_item val exception_ : ?loc:Ast_helper.loc -> Parsetree.extension_constructor -> Parsetree.signature_item val module_ : ?loc:Ast_helper.loc -> Parsetree.module_declaration -> Parsetree.signature_item val rec_module : ?loc:Ast_helper.loc -> Parsetree.module_declaration list -> Parsetree.signature_item val modtype : ?loc:Ast_helper.loc -> Parsetree.module_type_declaration -> Parsetree.signature_item val open_ : ?loc:Ast_helper.loc -> Parsetree.open_description -> Parsetree.signature_item val include_ : ?loc:Ast_helper.loc -> Parsetree.include_description -> Parsetree.signature_item val class_ : ?loc:Ast_helper.loc -> Parsetree.class_description list -> Parsetree.signature_item val class_type : ?loc:Ast_helper.loc -> Parsetree.class_type_declaration list -> Parsetree.signature_item val extension : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Parsetree.extension -> Parsetree.signature_item val attribute : ?loc:Ast_helper.loc -> Parsetree.attribute -> Parsetree.signature_item val text : Docstrings.text -> Parsetree.signature_item list end`