ute_map</span><span class='period'>.</span><span class='id identifier rubyid_key?'>key?</span><span class='lparen'>(</span><span class='id identifier rubyid_k'>k</span><span class='period'>.</span><span class='id identifier rubyid_to_sym'>to_sym</span><span class='rparen'>)</span><span class='rparen'>)</span>
      <span class='id identifier rubyid_fail'>fail</span> <span class='const'>ArgumentError</span><span class='comma'>,</span> <span class='tstring'><span class='tstring_beg'>&quot;</span><span class='