title: How to convert Range<Int> to Set<Int>?
body: <p>I want to convert a <code>Range</code> of <code>Int</code> to a <code>Set&lt;Int&gt;</code> like this</p>
  
  <p><code>[0..&lt;count]</code> -> <code>Set[1,2,3..count]</code>.</p>