private ExpressionInfo Expr_IncDec(XmlNode node)
{
var varNode = node.GetSubNode(AstConstants.Subnode + ":" + AstConstants.Subnodes.Var);
Analyze(varNode);
varNode = varNode.GetSubNodesByPrefix(AstConstants.Node).Single();
VariableResolveResult variabel = _varResolver.ResolveVariable(varNode);
return new ExpressionInfo() { ExpressionTaint = variabel.Variable.Info.Taints };
}