    <span class="n">extension</span> <span class="o">=</span> <span class="n">branch</span> <span class="k">if</span> <span class="n">pointer</span> <span class="o">==</span> <span class="n">tee</span> <span class="k">else</span> <span class="n">space</span> 
                    <span class="k">yield from</span> <span class="n">inner</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="n">prefix</span><span class="o">=</span><span class="n">prefix</span><span class=