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I really hoped that 1.8.5 and the sandbox would go hand and glove, but continuing development has caused a split from Ruby 1.8.5. (See the patch.) But, nevermind that, it’ll be okay, considering that the sandbox now loads gems!

 require 'sandbox'
 hpricot_broken = Sandbox.new :init => :all
 hpricot_broken.eval %{
 require 'rubygems'
 require_gem 'hpricot', '=0.4'
 require 'hpricot'
 puts Hpricot("<a class=test>link</a>").search(".test")
 }
 hpricot_fixed = Sandbox.new :init => :all
 hpricot_fixed.eval%{
 require 'rubygems'
 require_gem 'hpricot', '=0.4.47'
 require 'hpricot'
 puts Hpricot("<a class=test>link</a>").search(".test")
 }

Two separate versions of Hpricot, illustrating a broken version and a fixed version, both inside the same Ruby process. This is a new checkpoint for sandbox and I’m calling it 0.1. (Installation instructions.) Available on my development gems or, better yet, as a tarball.