Allow partial matching of keys not existing in a map

Question

When matching maps, it is sometimes useful to specify a map that doesn't include specific keys.

Eg. to specify a map that doesn't include a :foo key:


(def _! :clojure.core.logic/not-found)
(run* [x]
  (featurec x {:foo _!}))


The patch is minimal, and demonstrates the functionality.

Answer 1

Reference: https://clojure.atlassian.net/browse/LOGIC-168 (reported by hugoduncan)