-type t() ::
          #{type := syntax | type(),
            message := string(),
            line => pos_integer(),
            column => pos_integer()}.

-type type() ::
          {duplicate_request, RequestName :: atom()} |
          {duplicate_parameter, RequestName :: atom(), ParameterName :: atom()} |
          {missing_parameters, [ParameterName :: atom()]} |
          {unused_parameters, [ParameterName :: atom()]} |
          {io, term()}.