lib/hash_diff.rb in hash_diff-0.8.0 vs lib/hash_diff.rb in hash_diff-1.0.0

@@ -1,8 +1,10 @@
 require "hash_diff/version"
 require "hash_diff/comparison"
 
 module HashDiff
+  class NO_VALUE; end
+
   def self.patch!
     Hash.class_eval do
       def diff(right)
         HashDiff.left_diff(self, right)
       end