en'>(</span><span class='id identifier rubyid_str'>str</span><span class='rparen'>)</span>
  <span class='kw'>return</span> <span class='id identifier rubyid_str'>str</span><span class='period'>.</span><span class='id identifier rubyid_class'>class</span>             <span class='kw'>if</span> <span class='id identifier rubyid_str'>str</span><span class='period'>.</span><span class='id identifier rubyid_is_a?'>is_a?</span><span class='lparen'>(</span><span class='const'><span class='object_link'><a href="Si