
                    <p>
                      The return value defines the outcome of the whole generator.
                      If it is <code class="computeroutput"><span class="keyword">false</span></code>,
                      no further output is generated, immediately returning <code class="computeroutput"><span class="keyword">false</span></code> from the calling <code class="computeroutput"><span class="identifier">real_generator</span></code> as well. If
                      it is <code class="c