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| ANSI Common Lisp 3 Evaluation and Compilation 3.4 Lambda Lists ### 3.4.2 Generic Function Lambda Lists A generic function lambda list is used to describe the overall shape of the argument list to be accepted by a generic function. Individual method signatures might contribute additional keyword parameters to the lambda list of the effective method. A generic function lambda list is used by defgeneric. A generic function lambda list has the following syntax: lambda-list::= {var}* `[``&optional` `{`var | (var)`}`*`]` `[``&rest` var`]` `[``&key` `{`var | (`{`var | (keyword-name var)`}`)`}`* [`&allow-other-keys`]`]` A generic function lambda list can contain the lambda list keywords shown in the next figure.
Lambda List Keywords used by Generic Function Lambda Lists
&allow-other-keys | &optional |
&key | &rest |
A generic function lambda list differs from an ordinary lambda list in the following ways: Required arguments Zero or more required parameters must be specified. Optional and keyword arguments Optional parameters and keyword parameters may not have default initial value forms nor use supplied-p parameters. Use of &aux The use of &aux is not allowed.

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