def test_fails_to_parse_non_ll1(self):
e = self.assertSimpleParseFailure(
combinators.option(
combinators.sequence(primitives.match(lambda c: c == "h"),
primitives.match(lambda c: c == "e"))),
"hzllo")
self.assertEqual("z", e.value)
self.assertEqual(list("llo"), list(e.it))
self.assertEqual(set(), e.expected)
def test_parses_none(self):
self.assertParse(combinators.option(primitives.error(set())), None,
"hello", "hello")
def test_parses(self):
self.assertParse(combinators.option(primitives.any_), "h", "ello",
"hello")
