Sorry - gmail spasm....
What I was trying to say is that what I think your code is doing is running
a Clojure expression once and unifying with 0. It's equivalent to
precomputing that outside of the run*:
(let [result (count (run* [arg] (goal arg))]
(run* [q]
;; whatever-else-you-were doing
(== 0 result)))
Now, of course that expression could use some projected value or be
embedded in a goal that gets tested multiple times, but chances are that
the naive uses of that are probably not doing what you really want to do.
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