@Test public void testNotRIntersectionNotT() throws Exception {
		IntervalSet s = IntervalSet.of(0,'s');
		s.add('u',200);
		IntervalSet s2 = IntervalSet.of(0,'q');
		s2.add('s',200);
		String expecting = "{0..113, 115, 117..200}";
		String result = (s.and(s2)).toString();
		assertEquals(expecting, result);
	}
The following was broken:
	    {'\u0000'..'s', 'u'..'\uFFFE'} & {'\u0000'..'q', 's'..'\uFFFE'}=
	    {'\u0000'..'q', 's'}!!!! broken...
	 	'q' is 113 ascii
	 	'u' is 117
tool-testsuite/test/org/antlr/v4/test/tool/TestIntervalSet.java