moves Object#singleton_class to Kernel#singleton_class to match Ruby also there, same for #class_eval to simplify, and adds coverage for class_eval

actionpack/lib/action_dispatch/testing/integration.rb

@@ -1,6 +1,6 @@
 require 'stringio'
 require 'uri'
-require 'active_support/core_ext/object/singleton_class'
+require 'active_support/core_ext/kernel/singleton_class'
 require 'rack/test'
 require 'test/unit/assertions'
 

activerecord/lib/active_record/base.rb

@@ -11,7 +11,7 @@ require 'active_support/core_ext/hash/deep_merge'
 require 'active_support/core_ext/hash/indifferent_access'
 require 'active_support/core_ext/hash/slice'
 require 'active_support/core_ext/string/behavior'
-require 'active_support/core_ext/object/singleton_class'
+require 'active_support/core_ext/kernel/singleton_class'
 require 'active_support/core_ext/module/delegation'
 require 'active_support/core_ext/object/duplicable'
 require 'active_support/core_ext/object/blank'

activerecord/lib/active_record/migration.rb

@@ -1,4 +1,4 @@
-require 'active_support/core_ext/object/singleton_class'
+require 'active_support/core_ext/kernel/singleton_class'
 
 module ActiveRecord
   # Exception that can be raised to stop migrations from going backwards.

activerecord/lib/active_record/named_scope.rb

@@ -1,6 +1,6 @@
 require 'active_support/core_ext/array'
 require 'active_support/core_ext/hash/except'
-require 'active_support/core_ext/object/singleton_class'
+require 'active_support/core_ext/kernel/singleton_class'
 require 'active_support/core_ext/object/blank'
 
 module ActiveRecord

activesupport/lib/active_support/callbacks.rb

@@ -1,7 +1,7 @@
 require 'active_support/core_ext/array/wrap'
 require 'active_support/core_ext/class/inheritable_attributes'
 require 'active_support/core_ext/kernel/reporting'
-require 'active_support/core_ext/object/singleton_class'
+require 'active_support/core_ext/kernel/singleton_class'
 
 module ActiveSupport
   # Callbacks are hooks into the lifecycle of an object that allow you to trigger logic

activesupport/lib/active_support/core_ext/class/attribute.rb

@@ -1,4 +1,4 @@
-require 'active_support/core_ext/object/singleton_class'
+require 'active_support/core_ext/kernel/singleton_class'
 require 'active_support/core_ext/module/delegation'
 require 'active_support/core_ext/module/remove_method'
 

activesupport/lib/active_support/core_ext/class/delegating_attributes.rb

@@ -1,6 +1,6 @@
 require 'active_support/core_ext/object/blank'
 require 'active_support/core_ext/array/extract_options'
-require 'active_support/core_ext/object/singleton_class'
+require 'active_support/core_ext/kernel/singleton_class'
 require 'active_support/core_ext/module/remove_method'
 
 class Class

activesupport/lib/active_support/core_ext/kernel.rb

@@ -2,3 +2,4 @@ require 'active_support/core_ext/kernel/reporting'
 require 'active_support/core_ext/kernel/agnostics'
 require 'active_support/core_ext/kernel/requires'
 require 'active_support/core_ext/kernel/debugger'
+require 'active_support/core_ext/kernel/singleton_class'

activesupport/lib/active_support/core_ext/kernel/singleton_class.rb

@@ -1,12 +1,12 @@
-class Object
+module Kernel
   # Returns the object's singleton class.
   def singleton_class
     class << self
       self
     end
-  end unless respond_to?(:singleton_class)
+  end unless respond_to?(:singleton_class) # exists in 1.9.2
 
-  # class_eval on an object acts like singleton_class_eval.
+  # class_eval on an object acts like singleton_class.class_eval.
   def class_eval(*args, &block)
     singleton_class.class_eval(*args, &block)
   end

activesupport/lib/active_support/core_ext/object.rb

@@ -5,7 +5,6 @@ require 'active_support/core_ext/object/try'
 
 require 'active_support/core_ext/object/conversions'
 require 'active_support/core_ext/object/instance_variables'
-require 'active_support/core_ext/object/singleton_class'
 require 'active_support/core_ext/object/misc'
 require 'active_support/core_ext/object/extending'
 

activesupport/lib/active_support/core_ext/string/output_safety.rb

@@ -1,5 +1,5 @@
 require 'erb'
-require 'active_support/core_ext/object/singleton_class'
+require 'active_support/core_ext/kernel/singleton_class'
 
 class ERB
   module Util

activesupport/lib/active_support/memoizable.rb

@@ -1,4 +1,4 @@
-require 'active_support/core_ext/object/singleton_class'
+require 'active_support/core_ext/kernel/singleton_class'
 require 'active_support/core_ext/module/aliasing'
 
 module ActiveSupport

activesupport/test/core_ext/kernel_test.rb

@@ -41,6 +41,17 @@ class KernelTest < Test::Unit::TestCase
   def test_silence_stderr_with_return_value
     assert_equal 1, silence_stderr { 1 }
   end
+
+  def test_singleton_class
+    o = Object.new
+    assert_equal class << o; self end, o.singleton_class
+  end
+  
+  def test_class_eval
+    o = Object.new
+    class << o; @x = 1; end
+    assert_equal 1, o.class_eval { @x }
+  end
 end
 
 class KernelSupressTest < Test::Unit::TestCase

activesupport/test/core_ext/object_and_class_ext_test.rb

@@ -118,11 +118,6 @@ class ObjectTests < ActiveSupport::TestCase
     assert duck.acts_like?(:time)
     assert !duck.acts_like?(:date)
   end
-
-  def test_singleton_class
-    o = Object.new
-    assert_equal class << o; self end, o.singleton_class
-  end
 end
 
 class ObjectInstanceVariableTest < Test::Unit::TestCase

railties/lib/rails/generators.rb

@@ -3,7 +3,7 @@ $:.unshift(activesupport_path) if File.directory?(activesupport_path) && !$:.inc
 
 require 'active_support'
 require 'active_support/core_ext/object/blank'
-require 'active_support/core_ext/object/singleton_class'
+require 'active_support/core_ext/kernel/singleton_class'
 require 'active_support/core_ext/array/extract_options'
 require 'active_support/core_ext/hash/deep_merge'
 require 'active_support/core_ext/module/attribute_accessors'