pan><span class="kt">P</span><span class="o">&gt;</span><span class="p">(</span><span class="n">_</span> <span class="nv">effect</span><span class="p">:</span> <span class="kt">P</span><span class="p">)</span> <span class="k">where</span> <span class="kt">P</span> <span class="p">:</span> <span class="kt">Publisher</span><span class="p">,</span> <span class="kt">P</span><span class="o">.</span><span class="kt">Failure</span> <span class="o">==</span> <span class="kt">Never</span><span class="p">,</span> <sp