lib/predicate/nodes/not.rb in predicate-1.2.0 vs lib/predicate/nodes/not.rb in predicate-1.3.0

@@ -16,7 +16,11 @@
 
     def free_variables
       @free_variables ||= last.free_variables
     end
 
+    def evaluate(tuple)
+      !last.evaluate(tuple)
+    end
+
   end
 end