cheduling tokens</span>
<span class="w">  </span><span class="n">tf</span><span class="o">::</span><span class="n">Pipeline</span><span class="w"> </span><span class="n">pl</span><span class="p">(</span><span class="n">num_lines</span><span class="p">,</span>

<span class="w">    </span><span class="c1">// first pipe calls f1</span>
<span class="w">    </span><span class="n">tf</span><span class="o">::</span><span class="n">Pipe</span><span class="p">{</span><span class="n">tf</span><span class="o">::</span