Base options cant live in lazy loaded helpers as they then wont be available to set for config

actionpack/lib/action_view/base.rb

@@ -165,6 +165,10 @@ module Subclasses
     cattr_accessor :debug_rjs
     @@debug_rjs = false
 
+    # Specify the proc used to decorate input tags that refer to attributes with errors.
+    cattr_accessor :field_error_proc
+    @@field_error_proc = Proc.new{ |html_tag, instance| "<div class=\"field_with_errors\">#{html_tag}</div>".html_safe }
+
     class_attribute :helpers
     remove_method :helpers
     attr_reader :helpers

actionpack/lib/action_view/helpers/active_model_helper.rb

@@ -4,13 +4,6 @@
 require 'active_support/core_ext/object/blank'
 
 module ActionView
-  ActiveSupport.on_load(:action_view) do
-    class ActionView::Base
-      @@field_error_proc = Proc.new{ |html_tag, instance| "<div class=\"field_with_errors\">#{html_tag}</div>".html_safe }
-      cattr_accessor :field_error_proc
-    end
-  end
-
   module Helpers
     module ActiveModelHelper
       %w(input form error_messages_for error_message_on).each do |method|