title: Xcode 6 beta 3: invalid virtual filesystem overlay file
body: <p>After updating to Xcode 6 beta 3 the compiler keeps crashing with the following error:</p>
  
  <pre><code>/[Long-path-goes-here]/all-product-headers.yaml:4:13: error: Could not find closing ]!
    'roots': [
              ^
  fatal error: invalid virtual filesystem overlay file '/[Long-path-goes-here]/all-product-headers.yaml'
  1 error generated.
  </code></pre>