Defsetf Lambda Lists - ANSI Common Lisp

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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.

&allow-other-keys &key &rest
&environment &optional

Figure 3.19: Lambda List Keywords used by Defsetf Lambda Lists

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.