><span class="o">.</span><span class="n">parametrized</span>
        <span class="n">src_traced</span> <span class="o">=</span> <span class="n">Tracker</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">src</span><span class="p">)(</span><span class="n">x</span><span class="p">)</span><span class="o">.</span><span class="n">parametrized</span>

        <span class="n">src_traced</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span