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

static void assertEqualsVerbose(S msg, O x, O y) {
  if (!eq(x, y)) {
    if (x instanceof S && y instanceof S && (containsNewLine((S) x) || containsNewLine((S) y))) {
      print(unidiff((S) x, (S) 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(sfu(y) + " != " + sfu(x));
    scorer.add(false);
  } else {
    print("OK: " + sfu(x));
    scorer.add(true);
  }
}
endif