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| ANSI Common Lisp 3 Evaluation and Compilation 3.4 Lambda Lists ### 3.4.7 Defsetf Lambda Lists A defsetf lambda list is used by defsetf. A defsetf lambda list has the following syntax: lambda-list::= {var}* `[``&optional` `{`var | (var [init-form [supplied-p-parameter ]])`}`*`]` `[``&rest` var`]` `[``&key` `{`var | (`{`var | (keyword-name var)`}` [init-form [supplied-p-parameter ]])`}`* [`&allow-other-keys`]`]` `[``&environment` var`]` A defsetf lambda list can contain the lambda list keywords shown in the next figure.
Lambda List Keywords used by Defsetf Lambda Lists
&allow-other-keys | &key | &rest
&environment | &optional |
A defsetf lambda list differs from an ordinary lambda list only in that it does not permit the use of &aux, and that it permits use of &environment, which introduces an environment parameter.

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