!7

sclass X {

  S value;

  *() {}

  *(S *value) {}

}

p {

  Hasher<X> hasher = new Hasher<X>() {

    public int hashCode(X o) { ret _hashCode(o.value); }

    public bool equals(X a, X b) { ret a == null ? b == null : b != null && eq(a.value, b.value); }

  };

  CustomCompactHashSet<X> set = new(hasher);

  X x1 = X("hello");

  set.add(x1);

  assertTrue(set.contains(new X("hello")));

  assertFalse(set.contains(new X("world")));

  assertSame(x1, set.find(new X("hello")));

  assertNull(set.find(new X("world")));

  set.remove(x1);

  assertNull(set.find(new X("hello")));

  print("OK");

}