@Override
	public int getOriginalNumberOfAlts() {
		int n = 0;
		if ( recPrimaryAlts!=null ) n += recPrimaryAlts.size();
		if ( recOpAlts!=null ) n += recOpAlts.size();
		return n;
	}
Did we delete any labels on direct left-recur refs? Points at ID of ^(= ID el)
tool/src/org/antlr/v4/tool/LeftRecursiveRule.java