Boo.Lang.Parser.BooParserBase.parameter_modifier C# (CSharp) Method

        protected ParameterModifiers parameter_modifier()
        {
            ParameterModifiers pm;

                pm = ParameterModifiers.None;

            try {      // for error handling
            {
                match(REF);
                if (0==inputState.guessing)
                {
                    pm = ParameterModifiers.Ref;
                }
            }
            }
            catch (RecognitionException ex)
            {
            if (0 == inputState.guessing)
            {
                reportError(ex, "parameter_modifier");
                recover(ex,tokenSet_43_);
            }
            else
            {
                throw ex;
            }
            }
            return pm;
        }