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#common-lisp
New type specifiers can come into existence in two ways. First, defining a new structure type with defstruct automatically causes the name of the structure to be a new type specifier symbol. Second, the deftype special form can be used to define new type-specifier abbreviations.
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4.7. Defining New Type Specifiers
head><head>4.7. Defining New Type Specifiers Common Lisp the Language, 2nd Edition Next: Type Conversion Function Up: Type Specifiers Previous: Type Specifiers That 4.7. Defining New Type Specifiers New type specifiers can come into existence in two ways. First, defining a new structure type with defstruct automatically causes the name of the structure to be a new type specifier symbol. Second, the deftype special form can be used to define new type-specifier abbreviations. [Macro] deftype name lambda-list [[ {declaration}* | doc-string ]] {form}* This is very similar to a defmacro form: name is the symbol that identifies the type specifier be


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