This code used to work, but breaks in 3.0.3

README.txt

Something in rails 3.0.3 broke mysql2. 

It seems to also break some other gems: 
  https://github.com/ProtectedMethod/restful_acl/issues/issue/9

Works_with_rails_3.0.1.rb

    html_escape(tweet.text).
      gsub(/(http:\/\/[^ ]+)/i) do |m|
        link = link_to_outside(image_tag('external_link.png', :alt => "original link"), m)
      end.gsub(/@[a-z_0-9]+/i) do |m|
        u = User.find_by_twitter_handle(m[1..-1])
        u ? link_to_user(u) : m
      end.gsub(/(#[a-z_0-9]+)/i) do |m| 
        "<span class='hashtag'>#{m}</span>"
      end.html_safe

# --
# undefined method `visit_ActiveSupport_SafeBuffer' for #<Arel::Visitors::MySQL:0x105e24cc0>
# --

Works_with_rails_3.0.3.rb

    html_escape(tweet.text).
      gsub(/(http:\/\/[^ ]+)/i) do |m|
        link = link_to_outside(image_tag('external_link.png', :alt => "original link"), m)
      end.gsub(/@[a-z_0-9]+/i) do |m|
        u = User.find_by_twitter_handle(String.new(m[1..-1]))
        u ? link_to_user(u) : m
      end.gsub(/(#[a-z_0-9]+)/i) do |m| 
        "<span class='hashtag'>#{m}</span>"
      end.html_safe
# --
# note the use of String.new, since to_s will not work
# --