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| ANSI Common Lisp 3 Evaluation and Compilation 3.4 Lambda Lists 3.4.1 Ordinary Lambda Lists ### 3.4.1.5 Specifiers for aux variables These are not really parameters. If the lambda list keyword &aux is present, all specifiers after it are auxiliary variable specifiers. After all parameter specifiers have been processed, the auxiliary variable specifiers (those following `&aux`) are processed from left to right. For each one, init-form is evaluated and var is bound to that value (or to nil if no init-form was specified). &aux variable processing is analogous to let* processing.
     (lambda (x y &aux (a (car x)) (b 2) c) (list x y a b c))
        ==(lambda (x y) (let* ((a (car x)) (b 2) c) (list x y a b c)))

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