Source
clojure/contrib/datalog/rules.clj:167
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(defn non-base-rules
"Return a collection of rules that depend, somehow, on other rules"
[rs]
(let [pred (all-predicates rs)
non-base (fn [r]
(if (some #(pred %)
(map literal-predicate (:body r)))
r
nil))]
(remove nil? (map non-base rs))))
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