>str</span><span class='rparen'>)</span>
<span class='kw'>rescue</span> <span class='const'>NameError</span> <span class='op'>=&gt;</span> <span class='id identifier rubyid_ex'>ex</span>
  <span class='kw'>case</span> <span class='id identifier rubyid_ex'>ex</span><span class='period'>.</span><span class='id identifier rubyid_message'>message</span>
  <span class='kw'>when</span> <span class='tstring'><span class='regexp_beg'>/</span><span class='tstring_content'>uninitialized constant</span><span class='re