From: Brian Candler <b.candler@...>
Date: 2011-03-05T19:59:15+09:00
Subject: Re: uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)

http://www.ruby-forum.com/topic/1193619

"* RubyGems no longer requires 'thread'.  Rails < 3 will need to add
require 'thread' to their applications."

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