Hi all,
I'm still playing around with core.logic and managed to define relations
that allow for querying my custom java datastructures with it. Thanks a
ton to Ambrose, who has helped me a lot!
One thing that really made the programming extremely hard was that I
don't get any backtraces if an exception occurs inside a `run'. For
example, I get this in SLIME with M-x clojure-jack-in RET.
(defn wrongo [a b] false) ;; intentionally broken
;=> #'logic-introduction.extend/wrongo
(run* [q] (wrongo 1 2))
; Evaluation aborted.
The "; Evaluation aborted." instantly appears. No backtrace, no error
message, not even in the *swank* buffer.
If I use a plain "lein repl" instead, I get at least an error message:
(run* [q] (wrongo 1 2))
; ClassCastException java.lang.Boolean cannot be cast to
; clojure.lang.IFn clojure.core.logic.Substitutions (logic.clj:207)
But where is my backtrace?
I suspected it may have something to do with clj-stacktrace (0.2.4)
which I had installed as lein plugin. So i deleted
~/.lein/plugins/clj-stacktrace-0.2.4.jar
and tried again with the same results.
But although I deleted the clj-stacktrace jar (and validated that
there's no such jar anymore on my whole system using "sudo updatedb &&
locate clj-backtrace"), when I type (/ 1 0) at the REPL to provoke an
error, I still get a coloured, indented backtrace.
Why? Does leiningen ship with a built-in clj-stacktrace version? If
so, how can I deactivate it to check if that's my backtrace eater?
Bye,
Tassilo
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