System.Xml.Xsl.IlGen.XmlILOptimizerVisitor.Subs C# (CSharp) Method

        private QilNode Subs(QilNode expr, QilNode refOld, QilNode refNew) {
            QilNode result;

            this.subs.AddSubstitutionPair(refOld, refNew);
            if (expr is QilReference)
                result = VisitReference(expr);
            else
                result = Visit(expr);
            this.subs.RemoveLastSubstitutionPair();

            return result;
        }