fix typo in stale session check

--- vendor/rails/actionpack/lib/action_controller/session/abstract_store.rb.org 2009-04-02 17:08:06.000000000 -0600
+++ vendor/rails/actionpack/lib/action_controller/session/abstract_store.rb 2009-04-02 17:07:23.000000000 -0600
@@ -74,7 +74,7 @@
                 # Note that the regexp does not allow $1 to end with a ':'
                 $1.constantize
               rescue LoadError, NameError => const_error
-                raise ActionController::SessionRestoreError, "Session contains objects whose class definition isn\\'t available.\nRemember to require the classes for all objects kept in the session.\n(Original exception: \#{const_error.message} [\#{const_error.class}])\n"
+                raise ActionController::SessionRestoreError, "Session contains objects whose class definition isn\\'t available.\nRemember to require the classes for all objects kept in the session.\n(Original exception: #{const_error.message} [#{const_error.class}])\n"
               end
 
               retry

I think you should test it against www.m-w.com

i dunno - testing exceptions is pretty brittle as a rule. making the message less dynamic and/or having rails get less in the way would be my preference - it's turtles all the way down. ;-)