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Showing content from http://www.lispworks.com/documentation/lw71/LW/html/lw-810.htm below:

rebinding

Ensures unique names for all the variables in a groups of forms.

rebinding (&rest vars) &body body => form

vars

The variables to be rebound.

body

A body of forms, the variables in which should be unique.

Returns the body wrapped in a form that creates unique names for each variable.

Returns the body wrapped in a form which creates a unique name for each of the variables (compare with gensym) and binds these names to the values of the variables. This ensures that the body can refer to the variables without name clashes with other variables elsewhere.

After defining

(defmacro lister (x y)

   (rebinding (x y)

      '(list ,x ,y)))

the form (lister i j) macroexpands to

(LET* ((#:X-77 I)

       (#:Y-78 J))

          (LIST #:X-77 #:Y-78))

LispWorks User Guide and Reference Manual - 20 Sep 2017

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