@Override
        public Object evaluate(EvaluationContextImpl context) throws EvaluateException {
          try {
            return primary.evaluate(context);
          }
          catch (EvaluateException e) {
            try {
              Object res = fallback.evaluate(context);
              myIsFallback = true;
              return res;
            }
            catch (EvaluateException e1) {
              throw e;
            }
          }
        }
@Override
        public Object evaluate(EvaluationContextImpl context)