ntion.html?swift"><code>RbBlockRetention</code></a>.</p></td>
      </tr>
      
      <tr>
        <td><code>blockCall</code></td>
        <td><p>Swift code to pass as a block to the method.</p></td>
      </tr>
      
    </tbody>
  </table>


  <h5>Throws</h5>
  <p><a href="../types/rberror.html?swift#rubyexception_"><code>RbError.rubyException(_:)</code></a> if there is a Ruby exception.
<a href="../types/rberror.html?swift#badtype_"><code>RbError.badType(_:)</code></a> if <code>symbol</code> is not a s