Ppxlib_ast.Location_errorval of_exn : exn -> t optionval register_error_of_exn : (exn -> t option) -> unitval message : t -> stringval make : loc:Warnings.loc -> string -> sub:(Warnings.loc * string) list -> tval to_extension : t -> Migrate_parsetree.Ast_412.Parsetree.extensionval raise : t -> 'aval update_loc : t -> Warnings.loc -> t