You want an explicit gensym that scopes over both positions.
(defmacro a-macro
[m]
(let [f (gensym "f)]
`(fn [~f]
~(for [i# m]
`(* (:val ~f) ~i# )))))
Thanks,
Ambrose
On Wed, Aug 26, 2015 at 5:07 PM, Rafik NACCACHE <rafik.nacca...@gmail.com>
wrote:
> Suppose I have the following macro, which generates a function that does
> some repetitive generation, let's say:
>
> (defmacro a-macro
> [m]
> `(fn [f#]
> ~(for [i# m]
> `(* (:val f#) ~i# ))))
>
> Note how I start with a quoted block in which I emit the fn header, and in
> which I use a gensym to capture its input, F#. I unquote to do my iterative
> processing, then I quote again to emit my macro output.
>
> If I macroexpand this:
> (clojure.pprint/pprint (macroexpand '(a-macro (1 2 3))))
>
> I get :
>
> (fn*
> ([f__11552__auto__]
> ((clojure.core/* (:val f__11551__auto__) 1)
> (clojure.core/* (:val f__11551__auto__) 2)
> (clojure.core/* (:val f__11551__auto__) 3))))
>
> And I have a problem. The auto gensym for args declaration (...11522) is
> different from the gensyms applying this arg in my generated function body
> (...11551), so I cannot call my function.
>
> Any Idea why is that? And Can you please help me to sort this kind of
> situation?
>
> Thank you;
>
> Rafik
>
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