Calling less-specific methods
Factor handbook > The language > Objects > Generic words and methods

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If a generic word is called with an object and multiple methods specialize on classes that this object is an instance of, usually the most specific method is called (Method precedence).

Less-specific methods can be called directly:

A lower-level word which the above expands into:
(call-next-method) ( method -- )

To look up the next applicable method reflectively:
next-method ( class generic -- method/f )

Errors thrown by improper calls to call-next-method:
inconsistent-next-method ( class generic -- * )

no-next-method ( method -- * )