Boo.Lang.Compiler.Steps.GeneratorMethodProcessor.GetDefaultYieldValue C# (CSharp) 메소드

        private Expression GetDefaultYieldValue()
        {
            if (_generatorItemType.IsValueType)
            {
                if (null == _nullValueField)
                {
                    _nullValueField = _enumerator.AddField("$empty", _generatorItemType);
                }
                return CodeBuilder.CreateReference(_nullValueField);
            }
            return new NullLiteralExpression();
        }