@Test
public void testSequence_5Parsers() {

  Parser<Void> parser = Parsers.sequence(
      Scanners.isChar('a'), Scanners.isChar('b'), Scanners.isChar('c'),
      Scanners.isChar('d'), Scanners.isChar('e'));
  assertEquals("sequence", parser.toString());
  assertEquals(null, parser.parse("abcde", mode));
  assertFailure(mode, parser, "bbcde", 1, 1);
  assertFailure(mode, parser, "aacde", 1, 2);
  assertFailure(mode, parser, "abbde", 1, 3);
  assertFailure(mode, parser, "abcce", 1, 4);
  assertFailure(mode, parser, "abcdd", 1, 5);
}