5 files changed, 6 insertions, 13 deletions
diff --git a/activesupport/lib/active_support/cache/file_store.rb b/activesupport/lib/active_support/cache/file_store.rb
index 5be63af342..2c1ad60d44 100644
--- a/activesupport/lib/active_support/cache/file_store.rb
+++ b/activesupport/lib/active_support/cache/file_store.rb
@@ -1,6 +1,5 @@
 require 'active_support/core_ext/file/atomic'
 require 'active_support/core_ext/string/conversions'
-require 'active_support/core_ext/object/inclusion'
 require 'uri/common'
 
 module ActiveSupport
@@ -23,7 +22,7 @@ module ActiveSupport
       end
 
       def clear(options = nil)
-        root_dirs = Dir.entries(cache_path).reject{|f| f.in?(EXCLUDED_DIRS + [".gitkeep"])}
+        root_dirs = Dir.entries(cache_path).reject {|f| (EXCLUDED_DIRS + [".gitkeep"]).include?(f)}
         FileUtils.rm_r(root_dirs.collect{|f| File.join(cache_path, f)})
       end
 
@@ -151,7 +150,7 @@ module ActiveSupport
         # Delete empty directories in the cache.
         def delete_empty_directories(dir)
           return if dir == cache_path
-          if Dir.entries(dir).reject{|f| f.in?(EXCLUDED_DIRS)}.empty?
+          if Dir.entries(dir).reject {|f| EXCLUDED_DIRS.include?(f)}.empty?
             File.delete(dir) rescue nil
             delete_empty_directories(File.dirname(dir))
           end
@@ -165,7 +164,7 @@ module ActiveSupport
         def search_dir(dir, &callback)
           return if !File.exist?(dir)
           Dir.foreach(dir) do |d|
-            next if d.in?(EXCLUDED_DIRS)
+            next if EXCLUDED_DIRS.include?(d)
             name = File.join(dir, d)
             if File.directory?(name)
               search_dir(name, &callback)
diff --git a/activesupport/lib/active_support/callbacks.rb b/activesupport/lib/active_support/callbacks.rb
index 8f79334159..3f7d0e401a 100644
--- a/activesupport/lib/active_support/callbacks.rb
+++ b/activesupport/lib/active_support/callbacks.rb
@@ -3,7 +3,6 @@ require 'active_support/descendants_tracker'
 require 'active_support/core_ext/class/attribute'
 require 'active_support/core_ext/kernel/reporting'
 require 'active_support/core_ext/kernel/singleton_class'
-require 'active_support/core_ext/object/inclusion'
 
 module ActiveSupport
   # \Callbacks are code hooks that are run at key points in an object's lifecycle.
@@ -353,7 +352,7 @@ module ActiveSupport
       # CallbackChain.
       #
       def __update_callbacks(name, filters = [], block = nil) #:nodoc:
-        type = filters.first.in?([:before, :after, :around]) ? filters.shift : :before
+        type = [:before, :after, :around].include?(filters.first) ? filters.shift : :before
         options = filters.last.is_a?(Hash) ? filters.pop : {}
         filters.unshift(block) if block
 
diff --git a/activesupport/lib/active_support/rails.rb b/activesupport/lib/active_support/rails.rb
index 933c6e6136..b05c3ff126 100644
--- a/activesupport/lib/active_support/rails.rb
+++ b/activesupport/lib/active_support/rails.rb
@@ -11,9 +11,6 @@
 # Defines Object#blank? and Object#present?.
 require 'active_support/core_ext/object/blank'
 
-# Defines Object#in?.
-require 'active_support/core_ext/object/inclusion'
-
 # Rails own autoload, eager_load, etc.
 require 'active_support/dependencies/autoload'
 
diff --git a/activesupport/lib/active_support/time_with_zone.rb b/activesupport/lib/active_support/time_with_zone.rb
index 451520ac5c..93c2d614f5 100644
--- a/activesupport/lib/active_support/time_with_zone.rb
+++ b/activesupport/lib/active_support/time_with_zone.rb
@@ -1,6 +1,5 @@
 require 'active_support/values/time_zone'
 require 'active_support/core_ext/object/acts_like'
-require 'active_support/core_ext/object/inclusion'
 
 module ActiveSupport
   # A Time-like class that can represent a time in any time zone. Necessary because standard Ruby Time instances are
@@ -339,7 +338,7 @@ module ActiveSupport
       end
 
       def duration_of_variable_length?(obj)
-        ActiveSupport::Duration === obj && obj.parts.any? {|p| p[0].in?([:years, :months, :days]) }
+        ActiveSupport::Duration === obj && obj.parts.any? {|p| [:years, :months, :days].include?(p[0]) }
       end
 
       def wrap_with_time_zone(time)
diff --git a/activesupport/test/transliterate_test.rb b/activesupport/test/transliterate_test.rb
index b7076e9e58..b5d8142458 100644
--- a/activesupport/test/transliterate_test.rb
+++ b/activesupport/test/transliterate_test.rb
@@ -1,7 +1,6 @@
 # encoding: utf-8
 require 'abstract_unit'
 require 'active_support/inflector/transliterate'
-require 'active_support/core_ext/object/inclusion'
 
 class TransliterateTest < ActiveSupport::TestCase
 
@@ -16,7 +15,7 @@ class TransliterateTest < ActiveSupport::TestCase
     # create string with range of Unicode"s western characters with
     # diacritics, excluding the division and multiplication signs which for
     # some reason or other are floating in the middle of all the letters.
-    string = (0xC0..0x17E).to_a.reject {|c| c.in?([0xD7, 0xF7])}.pack("U*")
+    string = (0xC0..0x17E).to_a.reject {|c| [0xD7, 0xF7].include?(c)}.pack("U*")
     string.each_char do |char|
       assert_match %r{^[a-zA-Z']*$}, ActiveSupport::Inflector.transliterate(string)
     end