* @todo Implémenter cette méthode abstrasy.PCFx
*/
public Node eval(Node startAt) throws Exception {
startAt.isGoodArgsLength(false, 2);
Node enode = startAt.elementAt(1);
enode.requireNodeType(Node.TYPE_SYMBOL);
Node funct = null;
try{ funct=Heap.getv(enode.getSymbol()); } catch(Exception ex) { funct=null; }
if (funct != null) {
Node ocall = Node.createExpr();
ocall.addElement(enode);