Common Lisp the Language, 2nd Edition


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28.1.6.4. Congruent Lambda-Lists for All Methods of a Generic Function

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These rules define the congruence of a set of lambda-lists, including the lambda-list of each method for a given generic function and the lambda-list specified for the generic function itself, if given.

If a method-defining form that cannot specify generic function options creates a generic function, and if the lambda-list for the method mentions keyword arguments, the lambda-list of the generic function will mention &key (but no keyword arguments).
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