gensym in macro definition

I'm making exercises on macros and this is one I found in the archives of
the group.

;;; Define a macro n-of that takes a number n and an expression, and
;;; returns a list of n successive values returned by the expression

(defmacro n-of (n expression)
(let ((i (gensym)))
`(loop for ,i from 1 to ,n
collect ,expression)))

I wonder if the gensym is really necessary. According to the rules for
detecting variable capture in Graham's On Lisp I think it is. Am I right?

(If anyone can state some fun macro exercises, please do so.)

--
"Don't worry about people stealing your ideas. If your ideas are any
good, you'll have to ram them down people's throats."
-- Howard Aiken

.

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