removes Object#extended_by

activesupport/lib/active_support/core_ext/object/extending.rb

@@ -1,8 +1,4 @@
 require 'active_support/core_ext/object/blank'
 
 class Object
-  def extended_by #:nodoc:
-    ancestors = class << self; ancestors end
-    ancestors.select { |mod| mod.class == Module } - [ Object, Kernel ]
-  end
 end

activesupport/test/core_ext/object_and_class_ext_test.rb

@@ -40,13 +40,6 @@ class Foo
 end
 
 class ObjectTests < Test::Unit::TestCase
-  def test_extended_by
-    foo = Foo.new
-    assert foo.extended_by.include?(Bar)
-    foo.extend(Baz)
-    assert(([Bar, Baz] - foo.extended_by).empty?, "Expected Bar, Baz in #{foo.extended_by.inspect}")
-  end
-
   class DuckTime
     def acts_like_time?
       true