title: Add a message to the $error MessageBag
body: <p>This is Laravel 4.2</p>
  
  <p>Laravel will make the $error MessageBag available to views. This can be populated with flash messages in the <em>previous</em> page by redirecting <code>-&gt;withErrors()</code>. That is fine if you are redirecting to a new page.</p>
  
  <pre><code>return Redirect::route('my_route')-&gt;withErrors($validator);
  </code></pre>
  
  <p>I am generating some errors in the controller, not validating a form, and want to put those messages into the $errors MessageBag that Laravel automatically passes into the views. But how? The MessageBag is <em>somewhere</em>, but how do I get to it, and how do I add some messages to it to display in the <em>current</em> page?</p>