lass='id identifier rubyid_is_a?'>is_a?</span><span class='lparen'>(</span><span class='const'>String</span><span class='rparen'>)</span>
  <span class='kw'>return</span> <span class='const'>Object</span><span class='period'>.</span><span class='id identifier rubyid_const_get'>const_get</span><span class='lparen'>(</span><span class='id identifier rubyid_str'>str</span><span class='rparen'>)</span> <span class='kw'>unless</span> <span class='id identifier rubyid_str'>str</span><span class='period'>.</span><