Thanks for the insight, Konrad. I know this is a sideshow to the larger
discussion on types, but it does present an unexpected usability issue.
On 26 February 2009 at 02:44, Konrad Hinsen wrote:
> The fix is to provide a default implementation for print-method. Try
> executing this:
>
> (defmethod print-method :default [o w] (print-method "failed" w))
This prevents the stack overflow. But I'd prefer a more forgiving default print
behavior.
> There should be a default in clojure.core, but I am not
> sure what it should best be. Should it print the object stripped of
> its metadata?
I vote for this. A default that re-dispatches on class (as you suggested,
stripping the :type metadata), falls back to the previous print behavior.
(defmethod print-method :default [o, #^java.io.Writer w]
(if (:type (meta o))
(print-method (with-meta o (dissoc (meta o) :type)) w)
(do
(.write w "#<")
(.write w (.getSimpleName (class o)))
(.write w " ")
(.write w (str o))
(.write w ">"))))
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