Hi Joachim.
On Mon, Apr 2, 2012 at 3:51 PM, Joachim De Beule
<[email protected]> wrote:
> which expands into the following (valid) code:
>
> (defrecord R (content) tmp-protocol (do-sth [this] this)),
how did you get that expansion? Try this:
user=> (macroexpand-1 '(my-defrecord R [content]))
(clojure.core/defrecord R (content) user/MyProtocol
(user/do-something [user/this] user/this))
Now it's obvious why it fails: Clojure's syntax-quote expands "this"
to a symbol in the current namespace which, of course, doesn't exist.
The idiomatic way to hygienically introduce local variables (function
arguments in this case) is to suffix them with #, i.e.:
(defmacro my-defrecord [name [& fields] & body]
`(defrecord ~name ~fields
MyProtocol
(do-something [this#] this#)
~@body))
HTH,
Moritz
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