title: 'sass' in a non thread-safe way
body: <p>I'm getting these <em>warnings</em> when trying to use <em>sass</em> in Rails 3.1 rc1.</p>
  
  <pre><code>WARN: tilt autoloading 'sass' in a non thread-safe way; explicit require 'sass' suggested.
  WARN: tilt autoloading 'sass/plugin' in a non thread-safe way; explicit require 'sass/plugin' suggested.
  </code></pre>
  
  <p>This is my Gemfile.</p>
  
  <pre><code>gem "rails", "~&gt; 3.1.0.rc1"
  gem "haml"
  gem "sass"
  </code></pre>
  
  <p>I've tried to create a file called <code>sass.rb</code> inside the <code>config/initializers</code> containing this code.</p>
  
  <pre><code>require "sass"
  </code></pre>
  
  <p>Changing the Gemfile to this.</p>
  
  <pre><code>gem "rails", "~&gt; 3.1.0.rc1"
  gem "haml"
  gem "sass", require: false
  </code></pre>
  
  <p>But the warnings remains.
  Anyone knows how to solve it?</p>
  
  <p>I found <a href="https://github.com/tenderlove/tilt/blob/master/lib/tilt.rb#L155" rel="noreferrer">the code</a> that is printing the warnings, if that is to any help.</p>