svoid test_EnglishDateParser() {
  //long baseDate = parseYMDHMS_slashesSpaceColons("2019/02/05 18:23:15");
  
  delegate Day to DateStructures.
  delegate Month to DateStructures.
  delegate Year to DateStructures.
  delegate CurrentWeekPlus to DateStructures.
  delegate Weekday to DateStructures.
  //replace DS with DateStructures.
  
  new EnglishDateParser parser;
  parser.assumeFuture = true; // maybe not needed
  testFunctionValues(s -> parser.parse((S) s),
    "2020/5/13" := new Day(13, new Month(5, new Year(2020))),
    "tuesday" := new Weekday(3, null),
    "next tuesday" := new Weekday(3, new CurrentWeekPlus(1)),
    "in 5 days" := new TodayPlus(5),
    "10 days from now" := new TodayPlus(10),
  );
}