public virtual bool VisitErrorStatement(ErrorStatement errorStatement, object d)
 {
     if ((errorStatement == null)) {
         return SetFailure();
     }
     if ((d == null)) {
         return SetFailure();
     }
     if ((errorStatement.Expression == null)) {
         return SetFailure();
     }
     if(errorStatement.GetType() != d.GetType()) {return SetFailure();}
     var data = (ErrorStatement)d;
     if (!IsMatch(errorStatement, data)) {
         return SetFailure();
     }
     return errorStatement.Expression.AcceptVisitor(this, data.Expression);
 }