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| ANSI Common Lisp 3 Evaluation and Compilation 3.4 Lambda Lists ### 3.4.8 Deftype Lambda Lists A deftype lambda list is used by deftype. A deftype lambda list has the same syntax as a macro lambda list, and can therefore contain the lambda list keywords as a macro lambda list. A deftype lambda list differs from a macro lambda list only in that if no init-form is supplied for an optional parameter or keyword parameter in the lambda-list, the default value for that parameter is the symbol * (rather than nil).

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