Symbol#to_proc is not needed for Ruby >= 1.8.7

actionpack/test/controller/filters_test.rb

 require 'abstract_unit'
-require 'active_support/core_ext/symbol'
 
 class ActionController::Base
   class << self

activerecord/lib/active_record/base.rb

@@ -12,7 +12,6 @@
 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/symbol'
 require 'active_support/core_ext/object/metaclass'
 
 module ActiveRecord #:nodoc:

activeresource/test/cases/base/load_test.rb

 require 'abstract_unit'
 require "fixtures/person"
 require "fixtures/street_address"
-require 'active_support/core_ext/symbol'
 require 'active_support/core_ext/hash/conversions'
 
 module Highrise

activesupport/lib/active_support/core_ext/symbol.rb

-require 'active_support/core_ext/symbol/to_proc'

activesupport/lib/active_support/core_ext/symbol/to_proc.rb

-class Symbol
-  # Turns the symbol into a simple proc, which is especially useful for enumerations. Examples:
-  #
-  #   # The same as people.collect { |p| p.name }
-  #   people.collect(&:name)
-  #
-  #   # The same as people.select { |p| p.manager? }.collect { |p| p.salary }
-  #   people.select(&:manager?).collect(&:salary)
-  #
-  # This is a builtin method in Ruby 1.8.7 and later.
-  def to_proc
-    Proc.new { |*args| args.shift.__send__(self, *args) }
-  end unless :to_proc.respond_to?(:to_proc)
-end

activesupport/lib/active_support/ruby/shim.rb

@@ -9,7 +9,6 @@
 # Process     Process.daemon
 # REXML       security fix
 # String      ord
-# Symbol      to_proc
 # Time        to_date, to_time, to_datetime
 require 'active_support'
 require 'active_support/core_ext/date/calculations'
@@ -20,5 +19,4 @@
 require 'active_support/core_ext/process/daemon'
 require 'active_support/core_ext/string/conversions'
 require 'active_support/core_ext/rexml'
-require 'active_support/core_ext/symbol/to_proc'
 require 'active_support/core_ext/time/conversions'

activesupport/test/core_ext/enumerable_test.rb

 require 'abstract_unit'
 require 'active_support/core_ext/array'
-require 'active_support/core_ext/symbol'
 require 'active_support/core_ext/enumerable'
 
 Payment = Struct.new(:price)

activesupport/test/core_ext/symbol_test.rb

-require 'abstract_unit'
-
-class SymbolTests < Test::Unit::TestCase
-  def test_to_proc
-    assert_equal %w(one two three), [:one, :two, :three].map(&:to_s)
-    assert_equal(%w(one two three),
-      {1 => "one", 2 => "two", 3 => "three"}.sort_by(&:first).map(&:last))
-  end
-end

activesupport/test/dependencies_test.rb

@@ -3,7 +3,6 @@
 require 'active_support/dependencies'
 require 'active_support/core_ext/module/loading'
 require 'active_support/core_ext/kernel/reporting'
-require 'active_support/core_ext/symbol/to_proc'
 
 module ModuleWithMissing
   mattr_accessor :missing_count