lib/option.rb in option-1.0.1 vs lib/option.rb in option-1.1.0

@@ -8,10 +8,11 @@
       when OptionClass then or_nil == that.or_nil
       else or_nil == that
     end
   end
 
+
   private
 
   def assert_option(result)
     case result
       when OptionClass then return result
@@ -96,9 +97,17 @@
     end
   end
 end
 
 class NoneClass < OptionClass
+
+  def dup
+    raise TypeError, "can't dup NoneClass"
+  end
+
+  def clone
+    raise TypeError, "can't clone NoneClass"
+  end
 
   def to_a
     []
   end