2 files changed, 9 insertions, 0 deletions
diff --git a/lib/delegate.rb b/lib/delegate.rb
index 2a30bc94b1..97467cd435 100644
--- a/lib/delegate.rb
+++ b/lib/delegate.rb
@@ -49,6 +49,14 @@ class Delegator
   end
   alias initialize_methods initialize
 
+  def method_missing(m, *args)
+    target = self.__getobj__
+    unless target.respond_to?(m)
+      super(m, *args)
+    end
+    target.__send__(m, *args)
+  end
+
   def __getobj__
     raise NotImplementedError, "need to define `__getobj__'"
   end
diff --git a/lib/set.rb b/lib/set.rb
index 586a5d9f4d..0ad47c842f 100644
--- a/lib/set.rb
+++ b/lib/set.rb
@@ -519,6 +519,7 @@ end
 
 module Enumerable
   # Makes a set from the enumerable object with given arguments.
+  # Needs to +require "set"+ to use this method.
   def to_set(klass = Set, *args, &block)
     klass.new(self, *args, &block)
   end