If you want that, you don't need macro.
(defn bench [f]
(let [start ...
result (f)] ; note the call to f
....))
But you would have to call it with:
(bench #(expr)) or (bench (fn [] expr))
You cannot do it directly because it would evaluate expr before the
call to bench.
This one of the usual use of macros: altering evaluation order.
(bench, or, and....)
Somehow, I think both are useful
(defn bench-fn [f]....)
(defmacro bench [expr] `(bench-fn ~expr))
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