title: Issue with Instance variable and Rspec 2.x
body: <p>I am using Rspec 2.0.  I am not understanding how the scope works here... Somehow you can read the variable in any block but I cannot update it? why is that?</p>
  
  <pre><code>describe 'Test App' do
    before(:all) do
      @test= :blah
    end
  
    it 'test' do
      @test=:bye
      p @test  #  =&gt;  prints bye 
    end
  
    it 'test' do
      p @test  #  =&gt;  prints blah rather than bye...
    end
  end
  </code></pre>