title: Where is Perl's postfix `for` syntax documented?
body: <p>I recently came across the following code snippet</p>
  
  <pre><code>$count_stuff{$_}++ for @stuff;
  </code></pre>
  
  <p>It's a pretty convenient way to use a hash to count occurrences of strings in an array for example. I understand <em>how</em> it works, but not <em>why</em> it works. I can not find the documentation for this way of using <strong>for</strong>.</p>
  
  <p>Why does it work? And where is the documentation?</p>