![[LISPWORKS]](../Graphics/LWSmall.gif)
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.