title: Laravel custom validator function not being called
body: <p>I'm trying to add a custom rule for validator, but it's not working at all, the function is not even called. I took this from documentation(<a href="https://laravel.com/docs/5.4/validation#custom-validation-rules" rel="nofollow noreferrer">https://laravel.com/docs/5.4/validation#custom-validation-rules</a>):</p>
  
  <p>In AppServiceProvider::boot I have this:</p>
  
  <pre><code>Validator::extend('foo', function ($attribute, $value, $parameters, $validator) {
     return false;
  });
  </code></pre>
  
  <p>and In my controller I have this:</p>
  
  <pre><code>$validator = Validator::make($request-&gt;all(), [
      'myField' =&gt; 'foo',
  ]);
  </code></pre>
  
  <p>The validator doesn't fail. What am I doing wrong?</p>