span class="nv">scheduler</span><span class="p">:</span> <span class="kt"><a href="../Protocols/ImmediateSchedulerType.html">ImmediateSchedulerType</a></span> <span class="o">=</span> <span class="kt"><a href="../Classes/CurrentThreadScheduler.html">CurrentThreadScheduler</a></span><span class="o">.</span><span class="n">instance</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Infallible</span><span class="o">&lt;</span><span class="kt">Element</span><span class="o">&gt;</span> 