$ script/plugin install git://github.com/rails/exception_notification.git
$ ls vendor/plugins/
exception_notification
$ cat vendor/plugins/exception_notification/init.rb
require "action_mailer"
require "exception_notifier"
require "exception_notifiable"
require "exception_notifier_helper"
$ script/console
Loading development environment (Rails 2.3.2)
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support \
/dependencies.rb:443:in `load_missing_constant':NameError: \
uninitialized constant ExceptionNotifier
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support \
/dependencies.rb:443:in `load_missing_constant':NameError: \
uninitialized constant ApplicationController
>> require "exception_notifier"
MissingSourceFile: no such file to load -- exception_notifier
Наверное, очевидно, но я устал сегодня.