// Technically Unit doesn't have to be a singleton since we override
// equals and hashCode. Blame it on the insatiable RAM savers

final sclass Unit {
  static Unit unit = new(true);
  
  *() { fail(); }
  *(bool dummy) {}
  
  static Unit get() { ret unit; }
  
  toString { ret "unit"; }
  
  @Override public bool equals(O o) { ret o instanceof Unit; }
  @Override public int hashCode() { ret 1337; }
}