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:- instance_method +Name/+Arity.
The message Name/Arity is declared to support instance methods in a class. This means that instances of this class, and its descendants, may each define their own methods for this message.
A method defined for this message by the class is considered the default method for the message. An instance that does not define its own method uses the default. Defining a new method overrides this default method; there is no need to explicitly remove it.
An instance method is installed in an instance of the class with the
define_method/3 predicate. An instance method is removed from an
instance of the class, reverting to the default method, with the
Must occur within the scope of the class definition. Only applies to send messages.