Thank you, all, for the very useful information.

Stacktrace after StackOverflowError turns out:

StackOverflowError   clojure.lang.RT.nth (RT.java:764)
rete.core=> (clojure.stacktrace/e)
java.lang.StackOverflowError: null
 at clojure.lang.RT.nth (RT.java:764)
    rete.core$fact_id.invoke (core.clj:403)
    rete.core$retract_fact$fn__1902.invoke (core.clj:633)
    clojure.core$complement$fn__4048.invoke (core.clj:1357)
    clojure.core$filter$fn__4226.invoke (core.clj:2533)
    clojure.lang.LazySeq.sval (LazySeq.java:42)
    clojure.lang.LazySeq.seq (LazySeq.java:60)
    clojure.lang.RT.seq (RT.java:484)
nil
rete.core=> 

 This list with a problem *ofacts* was been intensively updated by *cons* 
and *remove* operations (more precisely, *rete.core/retract-fact* function 
visible in stacktrace contains a call to *remove*). Thus, probably, John is 
nearer then others to solution. So, the question is: What can I do to avoid 
recursive *remove* operation? May be I should rewrite it using *loop*? Does 
this help? Or recursion remains inside *loop*?

пятница, 8 ноября 2013 г., 13:17:28 UTC+4 пользователь ru написал:
>
> Dear clojure-users,
>
> StackOverflowError   clojure.lang.RT.nthFrom (RT.java:789)
>
> I got this error message during evaluation of "count" function call on a 
> quite short list (about 200 elements). What can be reasons of the error. 
> Any hints would be greatly appreciated.
>
> Sincerely,
>   Ru 
>

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