1.6.13. Get the parameter list node for a function

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You should use this macro to get the parameter list for a built-in function or operator. Both built-in functions and operators get their parameter list as and expression list. This macro gets the first list node of the expression list.

The parameter is presented as an expression list even if there is only a single parameter for the function.

To access the parameters use the macros CAR and CDR.

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