title: What should ellipsis in attribute-list in C++ be used for?
body: <p>In <a href="http://en.cppreference.com/w/cpp/language/attributes" rel="noreferrer">C++ reference</a> I found information about allowed syntax of attributes in C++, it is:</p>
  
  <pre><code>[[attribute-list]]
  [[ using attribute-namespace : attribute-list ]]
  </code></pre>
  
  <p>"where attribute-list is a comma-separated sequence of zero or more attributes (possibly ending with an ellipsis ... indicating a pack expansion)" </p>
  
  <p>I've tried to use its, but I see no difference between:</p>
  
  <pre><code>[[deprecated]] void f() 
  {
  }
  </code></pre>
  
  <p>and</p>
  
  <pre><code>[[deprecated...]] void f() 
  {
  }
  </code></pre>
  
  <p>In both cases output is the same.</p>