@Override
	public Handle ruleRef(GrammarAST node) {
		Handle h = _ruleRef(node);
		return h;
	}
For reference to rule {@code r}, build

<pre>
 o-&gt;(r)  o
</pre>

where {@code (r)} is the start of rule {@code r} and the trailing
{@code o} is not linked to from rule ref state directly (uses
{@link RuleTransition#followState}).
tool/src/org/antlr/v4/automata/ParserATNFactory.java