public virtual void Visit(CustomPreprocess preprocess)
 {
 }
 public override void Visit(CustomPreprocess preprocess)
 {
     PopChildren();
     Return("_{[:" + preprocess.MethodName + "]}");
 }
 void Relabelling(out PreProcessActions preproc)
 {
     preproc = null; string relabelTo, relabelFrom; RelabelActions labels = new RelabelActions();
     Expect(21);
     Token first = t;
     if (la.kind == 6) {
     Get();
     preproc = new CustomPreprocess(t.val.Replace(":","")); SetPos(preproc, first);
     } else if (la.kind == 3) {
     Get();
     relabelTo = t.val; SetPos(labels, first);
     Expect(22);
     Expect(3);
     relabelFrom = t.val; labels.Add(relabelFrom, relabelTo);
     while (la.kind == 11) {
         Get();
         Expect(3);
         relabelTo = t.val;
         Expect(22);
         Expect(3);
         relabelFrom = t.val; labels.Add(relabelFrom, relabelTo);
     }
     preproc = labels;
     } else SynErr(44);
     Expect(23);
 }