static void assertEqualsVerbose(O x, O y) {
  assertEqualsVerbose(null, x, y);
}

static void assertEqualsVerbose(S msg, O x, O y) {
  if (!eq(x, y))
    fail((msg != null ? msg + ": " : "") + sfu(y) + " != " + sfu(x));
  else
    print("OK: " + sfu(x));
}

ifclass Scorer
static void assertEqualsVerbose(Scorer scorer, O x, O y) {
  if (!eq(x, y)) {
    print((msg != null ? msg + ": " : "") + sfu(y) + " != " + sfu(x));
    scorer.add(false);
  } else
    print("OK: " + sfu(x));
    scorer.add(true);
  }
}
endif