public void help() {
		info("ANTLR Parser Generator  Version " + Tool.VERSION);
		for (Option o : optionDefs) {
			String name = o.name + (o.argType!=OptionArgType.NONE? " ___" : "");
			String s = String.format(" %-19s %s", name, o.description);
			info(s);
		}
	}
@since 4.7.1 in response to -Xexact-output-dir
tool/src/org/antlr/v4/Tool.java