On Fri, Sep 25, 2009 at 4:49 PM, Constantine Vetoshev <[email protected]>wrote:
> (let [f1 #(inc %)]
> (defmacro m1 [x]
> `(~f1 ~x)))
>
> (m1 12)
> => No message.
> [Thrown class java.lang.ExceptionInInitializerError]
>
> The equivalent works in Common Lisp (Allegro CL and SBCL):
>
> (let ((f1 (lambda (y) (1+ y))))
> (defmacro m1 (x)
> `(funcall ,f1 ,x)))
>
> (m1 12)
> => 13
>
> Thoughts on either of these brain teasers?
I don't think you can use things like defmacro in a let. Macros are used at
macroexpansion time and I don't think a let's bindings will exist yet. So
you probably need something like
(defmacro m1 [x]
(let [f1 #(inc %)]
`(~f1 ~x)))
instead.
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