title: chrono literals in VS2015
body: <p>The following code gives me a compile time error:</p>
  
  <pre><code>#include &lt;chrono&gt;
  
  int main() {
      auto day = 24h;
      return 0;
  }
  </code></pre>
  
  <p>Error C3688: invalid literal suffix 'h'; literal operator or literal operator template 'operator ""h' not found.</p>
  
  <p>I'm trying this on Visual Studio 2015 Update 1, which according to <a href="https://msdn.microsoft.com/en-us/library/mt243853.aspx" rel="noreferrer">this</a> should work, so what's going on?</p>