title: Where do I find the new Span<T>?
body: <p>Everyone is writing about how great the new type <code>Span&lt;T&gt;</code> is so I eagerly wanted to start rewriting a couple of methods in my libraries but where do I actually find it? I've updated Visual Studio 2017 to the latest version 15.5.0 where the change-log says:</p>
  <blockquote>
  <p>The C# compiler now supports the 7.2 set of language features including:</p>
  <ul>
  <li>Support for the <code>Span&lt;T&gt;</code> type being used throughout Kestrel and CoreFX via the ref struct modifier.</li>
  </ul>
  </blockquote>
  <p>but when I try to use it my code I'm getting an error and intellisense cannot resolve it. It's a .net 4.6.2 project and the language version is set to <em>latest minor</em>.</p>
  <p>Do I need to install some NuGet package in order to be able to use it? I can't figure this out.</p>