title: "Invalid use of 'this' in non-member function" in objective-c context?
body: <p>Using Xcode.</p>
  
  <p>In this code (func is declared in interface), tells subj error, standing on string with 'self'.</p>
  
  <pre><code>+ (void) run: (Action) action after: (int) seconds 
  {
      [self run:action after:seconds repeat:NO];
  }
  </code></pre>
  
  <p>What the... ?</p>