@Override
    public R visitSerial(SerialTree node, P p) {
        return defaultAction(node, p);
    }
@ Override public R visitSerial ( SerialTree node , P p ) { return defaultAction ( node , p ) ; }
{@inheritDoc} This implementation calls {@code defaultAction}.

@param node {@inheritDoc}
@param p {@inheritDoc}
@return  the result of {@code defaultAction}