System.Xml.Xsl.Qil.QilPatternFactory.CheckLogicArg C# (CSharp) Method

        private static void CheckLogicArg(QilNode arg) {
            Debug.Assert(arg != null, "Argulent shouldn't be null");
            Debug.Assert(arg.XmlType.TypeCode == XmlTypeCode.Boolean && arg.XmlType.IsSingleton,
                "The operand must be boolean-typed"
            );
        }