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 self
 Reference to current object in methods
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 Description:

    self is a local instance variable which is automatically defined in
    all methods.  It contains a reference to the current object, ie. the
    object which received the message which invoked the current method.

    For example, a statement such as obj:open() will normally invoke
    the open() method.  Inside that method, the self variable will
    contain a reference to the same object referred to by obj.

    Since self is typically used heavily inside methods, a special
    operator, the double-colon (::) has been provided as a shorthand
    for sending message to self.  See the :: entry for more
    information.