title: Repeat string with integer multiplication
body: <p>Is there an easy way to do the following (from Python) in Rust?</p>
  
  <p><code>&gt;&gt;&gt; print ("Repeat" * 4)
  RepeatRepeatRepeatRepeat
  </code></p>
  
  <p>I'm starting to learn the language, and it seems <code>String</code> doesn't override <code>Mul</code>, and I can't find any discussion anywhere on a compact way of doing this (other than a map or loop).</p>