Rails3 Segmentation Fault remove_method.rb when you have a library module

Mac OS X 10.5.8
Rails 3.0.0.beta2
ruby-1.9.1-p376
gem 1.3.6

/Users/aforward/.rvm/gems/ruby-1.9.1-p376/gems/activesupport-3.0.0.beta2/lib/active_support/core_ext/module/remove_method.rb:3: [BUG] Segmentation fault ruby 1.9.1p376 (2009-12-07 revision 26041) [i386-darwin9.8.0]

TO REPEAT THE BUG

rails myapp

cd myapp

rails server -p 3001

Everything works file at http://localhost:3001/

rm public/index.html

rails generate scaffold stuff name:string

rake db:migrate

Everything works file at http://localhost:3001/stuffs

vi lib/fail_fast.rb

Segmentation fault at any url, such as http://localhost:3001/stuffs

Any help would be greatly appreciated in migrating my libraries to Rails3. I first noticed this on Rails3 beta3, but after un-installing everything I still notice it on Rails3 beta2