fails:A singleton class is a singleton Class instance
fails:A singleton class is a subclass of Class's singleton class
fails(inherited):A singleton class is a subclass of the same level of Class's singleton class
fails(inherited):A singleton class doesn't have singleton class
fails:A constant on a singleton class can be accessed via const_get
fails:Defining instance methods on a singleton class define public methods
fails:Class methods of a singleton class include ones of the object's class
fails:Class methods of a singleton class for a singleton class include instance methods of the singleton class of Class
fails(inherited):Class methods of a singleton class for a singleton class include class methods of the singleton class of Class
fails:Instantiating a singleton class raises a TypeError when new is called
fails:Instantiating a singleton class raises a TypeError when allocate is called
fails:A constant on a singleton class is preserved when the object is cloned
