title: Is self retained within this Objective-C block?
body: <p>When I have a block in Objective-C that looks like this:</p>
  
  <pre><code>self.request = [[ASIHTTPRequest requestWithURL:...
  
  [self.longPollRequest setCompletionBlock:^{
      NSLog(@"%@", self.request.responseString);
  }];
  </code></pre>
  
  <p>will it retain <code>self</code> or explicitly retain <code>self.request</code>?</p>