4 files changed, 10 insertions, 8 deletions
diff --git a/actionpack/lib/abstract_controller/base.rb b/actionpack/lib/abstract_controller/base.rb
index 8edea0f52b..d4317399ed 100644
--- a/actionpack/lib/abstract_controller/base.rb
+++ b/actionpack/lib/abstract_controller/base.rb
@@ -1,13 +1,11 @@
 require 'erubis'
+require 'abstract_controller/error'
 require 'active_support/configurable'
 require 'active_support/descendants_tracker'
 require 'active_support/core_ext/module/anonymous'
 require 'active_support/core_ext/module/attr_internal'
 
 module AbstractController
-  class Error < StandardError #:nodoc:
-  end
-
   # Raised when a non-existing controller action is triggered.
   class ActionNotFound < StandardError
   end
@@ -78,7 +76,7 @@ module AbstractController
         end
       end
 
-      # action_methods are cached and there is sometimes need to refresh
+      # action_methods are cached and there is sometimes a need to refresh
       # them. ::clear_action_methods! allows you to do that, so next time
       # you run action_methods, they will be recalculated.
       def clear_action_methods!
diff --git a/actionpack/lib/abstract_controller/error.rb b/actionpack/lib/abstract_controller/error.rb
new file mode 100644
index 0000000000..7fafce4dd4
--- /dev/null
+++ b/actionpack/lib/abstract_controller/error.rb
@@ -0,0 +1,4 @@
+module AbstractController
+  class Error < StandardError #:nodoc:
+  end
+end
diff --git a/actionpack/lib/abstract_controller/helpers.rb b/actionpack/lib/abstract_controller/helpers.rb
index d84c238a62..ab4355296b 100644
--- a/actionpack/lib/abstract_controller/helpers.rb
+++ b/actionpack/lib/abstract_controller/helpers.rb
@@ -38,7 +38,8 @@ module AbstractController
       end
 
       # Declare a controller method as a helper. For example, the following
-      # makes the +current_user+ controller method available to the view:
+      # makes the +current_user+ and +logged_in?+ controller methods available
+      # to the view:
       #   class ApplicationController < ActionController::Base
       #     helper_method :current_user, :logged_in?
       #
diff --git a/actionpack/lib/abstract_controller/rendering.rb b/actionpack/lib/abstract_controller/rendering.rb
index e765d73ce4..a6fb0dbe1d 100644
--- a/actionpack/lib/abstract_controller/rendering.rb
+++ b/actionpack/lib/abstract_controller/rendering.rb
@@ -1,3 +1,4 @@
+require 'abstract_controller/error'
 require 'active_support/concern'
 require 'active_support/core_ext/class/attribute'
 require 'action_view'
@@ -59,9 +60,7 @@ module AbstractController
     end
 
     DEFAULT_PROTECTED_INSTANCE_VARIABLES = Set.new %i(
-      @_action_name @_response_body @_formats @_prefixes @_config
-      @_view_context_class @_view_renderer @_lookup_context
-      @_routes @_db_runtime
+      @_action_name @_response_body @_formats @_prefixes
     )
 
     # This method should return a hash with assigns.