@Override
	public int getRuleIndex() {
		return ruleIndex;
	}
Constructs a new {@link InterpreterRuleContext} with the specified
parent, invoking state, and rule index.

@param parent The parent context.
@param invokingStateNumber The invoking state number.
@param ruleIndex The rule index for the current context.
runtime/Java/src/org/antlr/v4/runtime/InterpreterRuleContext.java