title: error "Cannot open include file", but it's not included in code
body: <p>I got the error after installing November CTP in Visual Studio 2012.
  The error is in <code>unordered_set.hpp</code> of boost library. But I have not included <code>unordered_set</code> or <code>initializer_list</code> anywhere in the code. I used boost only in one file and I am sure it's not the reason.</p>
  
  <p>error in unordered_set.hpp:</p>
  
  <pre><code>#if !defined(BOOST_NO_0X_HDR_INITIALIZER_LIST)
  #include &lt;initializer_list&gt;  //error C1083: Cannot open include file: 'initializer_list': No such file or directory d:\boost\unordered\unordered_set.hpp
  #endif
  </code></pre>
  
  <p>EDIT: </p>
  
  <p>I uninstalled November CTP after, but still got the same error.</p>