public String toInfoString(Parser recognizer) {
		List<String> rules = recognizer.getRuleInvocationStack(this);
		Collections.reverse(rules);
		return "ParserRuleContext"+rules+"{" +
			"start=" + start +
			", stop=" + stop +
			'}';
	}
Used for rule context info debugging during parse-time, not so much for ATN debugging
runtime/Java/src/org/antlr/v4/runtime/ParserRuleContext.java