omputeroutput"><span class="identifier">x3</span><span class="special">::</span><span class="identifier">error_handler_result</span><span class="special">::</span><span class="identifier">fail</span></code> to tell X3 that we want to fail the
        parse when such an event is caught. You can return one of:
      </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                <p>
                  <code class="computeroutput"><span class="identifier