Seems like the expansion is trying to put the function's value in there,
and this has already been compiled. If the function' code is expanded
in-place it works.
user=> (defmacro bar
[a]
(let [b (keyword a)
f `(fn [& args#] ~b)]
`(deftype ~a []
clojure.lang.ILookup
(valAt [this# k#] (~f this# k#))
(valAt [this# k# d#] (~f this# k# d#)))))
#'user/bar
user=> (bar alex)
user.alex
user=> (def a (alex.))
#'user/a
user=> (:foo a :bar)
:alex
On Saturday, April 28, 2012 8:43:21 AM UTC-7, Shantanu Kumar wrote:
>
> Hi,
>
> I am running into error when using macros with deftype. For example,
> when I use the macro `foo` it works fine:
>
> (defmacro foo
> [a]
> (let [b (keyword a)]
> `(do ~b)))
>
> (foo alex)
> => :b
> whereas, when I use the macro `bar`:
>
> (defmacro bar
> [a]
> (let [b (keyword a)
> f (fn [& args] b)]
> `(deftype ~a []
> clojure.lang.ILookup
> (valAt [this# k#] (~f this# k#))
> (valAt [this# k# d#] (~f this# k# d#)))))
>
> (bar alex)
>
> I get the following error:
> CompilerException java.lang.ExceptionInInitializerError, compiling:
> (NO_SOURCE_PATH:87)
>
> Can somebody help me understand what am I doing wrong here.
>
> Shantanu
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