On 13 Sep 2010, at 00:24, icemaze wrote:
(use 'clojure.contrib.macro-utils)
(defn bug? []
(with-symbol-macros
(case 0
0 1)))
The REPL prints:
java.lang.ClassCastException: clojure.lang.PersistentVector cannot be
cast to clojure.lang.MapEntry (NO_SOURCE_FILE:4)
Can anyone confirm this, please?
I am not sure the problem comes from with-symbol-macros:
user=> (macroexpand-1 '(case 0 0 1))
(clojure.core/let [G__2400 0] (case* G__2400 0 1 0 0 (throw
(java.lang.IllegalArgumentException. (clojure.core/str "No matching
clause: " G__2400))) {0 [0 1]} false))
user=> (clojure.core/let [G__2400 0] (case* G__2400 0 1 0 0 (throw
(java.lang.IllegalArgumentException. (clojure.core/str "No matching
clause: " G__2400))) {0 [0 1]} false))
java.lang.ClassCastException: clojure.lang.PersistentVector cannot be
cast to clojure.lang.MapEntry (NO_SOURCE_FILE:2)
This suggests that something weird is going on in the interaction
between the case macro and the case* special form that implements it.
I don't have the time to look into this right now, unfortunately.
Konrad.
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