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| ANSI Common Lisp 3 Evaluation and Compilation 3.4 Lambda Lists ### 3.4.9 Define-modify-macro Lambda Lists A define-modify-macro lambda list is used by define-modify-macro. A define-modify-macro lambda list can contain the lambda list keywords shown in the next figure.
Lambda List Keywords used by Define-modify-macro Lambda Lists
&optional | &rest
Define-modify-macro lambda lists are similar to ordinary lambda lists, but do not support keyword arguments. define-modify-macro has no need match keyword arguments, and a rest parameter is sufficient. Aux variables are also not supported, since define-modify-macro has no body forms which could refer to such bindings. See the macro define-modify-macro.

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